Language：Japanese   Publishing type：Research paper (scientific journal)  

DOI： 10.3390/catal10010106

Web of Science

Scopus

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.3390/ma12223701

Web of Science

Scopus

PubMed

Language：English   Publishing type：Research paper (scientific journal)   Publisher：American Society of Clinical Oncology (ASCO)  

<jats:sec><jats:title>PURPOSE</jats:title><jats:p> S-1 is a standard postoperative adjuvant chemotherapy for patients with stage II or III gastric cancer in Asia. Neoadjuvant or perioperative strategies dominate in Western countries, and docetaxel has recently shown significant survival benefits when combined with other standard regimens in advanced cancer and perioperative settings. </jats:p></jats:sec><jats:sec><jats:title>PATIENTS AND METHODS</jats:title><jats:p> This randomized phase III study was designed to prove the superiority of postoperative S-1 plus docetaxel over S-1 alone for R0 resection of pathologic stage III gastric cancer. The sample size of 1,100 patients was necessary to detect a 7% increase in 3-year relapse-free survival as the primary end point (hazard ratio, 0.78; 2-sided α = .05; β = .2). </jats:p></jats:sec><jats:sec><jats:title>RESULTS</jats:title><jats:p> The second interim analysis was conducted when the number of events reached 216 among 915 enrolled patients (median follow-up, 12.5 months). Analysis demonstrated the superiority of S-1 plus docetaxel (66%) to S-1 (50%) for 3-year relapse-free survival (hazard ratio, 0.632; 99.99% CI, 0.400 to 0.998; stratified log-rank test, P < .001), and enrollment was terminated as recommended by the independent data and safety monitoring committee. Incidences of grade 3 or greater adverse events, particularly neutropenia and leukopenia, were higher in the S-1 plus docetaxel group, but all events were manageable. </jats:p></jats:sec><jats:sec><jats:title>CONCLUSION</jats:title><jats:p> Addition of docetaxel to S-1 is effective with few safety concerns in patients with stage III gastric cancer. The present findings may also be applicable in countries in which perioperative adjuvant chemotherapy or chemoradiation is not standard. </jats:p></jats:sec>

DOI： 10.1200/jco.18.01138

CiNii Research

Language：Japanese   Publishing type：Research paper (scientific journal)  

DOI： 10.1016/j.ijhydene.2018.12.044

Web of Science

Scopus

Language：Japanese   Publishing type：Research paper (scientific journal)  

DOI： 10.1038/s41598-018-34544-y

Web of Science

Scopus

PubMed

Language：Japanese   Publishing type：Research paper (scientific journal)  

DOI： 10.1016/j.apcatb.2018.03.021

Web of Science

Scopus

Language：Japanese   Publishing type：Research paper (scientific journal)  

DOI： 10.1021/acssuschemeng.8b01701

Web of Science

Scopus

CiNii Research

Language：Japanese   Publishing type：Research paper (scientific journal)  

DOI： 10.1002/celc.201700917

Web of Science

Scopus

Language：English   Publishing type：Research paper (scientific journal)   Publisher：The Chemical Society of Japan  

<p>Cellulosic biomass resources have considerable potential as a renewable energy source that can be used for the cogeneration of electricity and heat. The utilization of these resources generally requires three major systematic processes: gasification, gas processing, and gas utilization. If a power generator could operate using wood resources directly as fuels, then this system could be significantly simplified, thereby reducing initial equipment cost and enhancing application flexibility. An intermediate-temperature fuel cell could possibly realize such an operation; however, the fuel-cell characteristics, especially the catalytic activity of the Pt/C anode, are not sufficient at present. In this study, we attempted to improve the anode activity by alloying Pt with other metals, followed by optimization of the alloy in terms of its atomic ratio and content. The resulting PtFe/C anode yielded higher power densities (37–42 mW cm⁻²) and energy densities (125–169 Wh kg⁻¹) at 250 °C for fuels composed of cypress, tissue paper, and cotton, compared to those obtained using the Pt/C anode, despite its smaller Pt loading.</p>

DOI： 10.1246/bcsj.20170163

Web of Science

Scopus

CiNii Research

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1504/IJCISTUDIES.2016.10004364

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1504/IJDSS.2016.10000521

Language：Japanese   Publishing type：Research paper (scientific journal)  

DOI： 10.1149/2.0511706jes

Web of Science

Scopus

Language：Japanese   Publishing type：Research paper (scientific journal)  

DOI： 10.1149/2.0361709jes

Web of Science

Scopus

Language：Japanese   Publishing type：Research paper (scientific journal)  

DOI： 10.1007/978-3-319-70093-9_36

Web of Science

Scopus

Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：International Journal of Critical Infrastructures  

Symbolic regression problems can be solved using grammatical evolution (GE), an evolutionary computation (EC) method, to find a function that coincides satisfactorily with the given datasets. The evolutional approach of GE is based on the grammar learning paradigm, which can translate the genotype (binary digit) into the phenotype (terminals and non-terminals). Unlike traditional codons in a genotype, the fittest codons in phenotype represented by the Backus-Naur form (BNF) are difficult for next generation genes to inherit the traits of parents, accounting for crossover and mutation. For this issue, this article presents a proposal of an advanced improvement to GE using a two-dimensional gene (GE2DG). In contrast to multi-chromosomal GE (GEMC), our proposal not only encloses the two-dimensional gene-expression for symbolic regression, but also introduces one independent gene defined as a conditional statement to express a new BNF grammar of an if-then (-else) branch. In the experiments described herein, continuous/discontinuous non-branch functions and continuous/discontinuous branch functions, four testing patterns, are considered as numerical examples. Results show that GE2DG has better performance than the original GE or GEMC. Especially for the case of branch functions, GE with hybrid chromosome (GEHC), where GE2DG is incorporated with GEMC, has faster convergence in symbolic regression than other methods.

DOI： 10.1504/IJCIS.2017.083634

Scopus

Language：Japanese   Publishing type：Research paper (scientific journal)  

DOI： 10.1038/srep37463

Web of Science

Scopus

PubMed

Language：Japanese   Publishing type：Research paper (scientific journal)  

DOI： 10.1038/srep31691

Web of Science

Scopus

PubMed

Language：English   Publishing type：Research paper (scientific journal)   Publisher：The Chemical Society of Japan  

SnSO₄ was employed as an anode-active material for rechargeable batteries, where Sn⁴⁺ and Sn²⁺ ions are reduced to Sn²⁺ and Sn, respectively during charge while the inverse reactions occur during discharge. Undesired hydrogen production was substantially avoided by adjusting the charge voltage to 1.5 V. The resulting cell functioned as a battery with an electrical capacity of 258 mA h g⁻¹ at 10 mA cm⁻² and as a fuel cell with power densities of 55–125 mW cm⁻² at 0.8 V.

DOI： 10.1246/cl.151015

Web of Science

Scopus

CiNii Research

Language：Japanese   Publishing type：Research paper (scientific journal)  

DOI： 10.1002/celc.201500473

Web of Science

Scopus

PubMed

CiNii Research

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

Language：Japanese   Publishing type：Research paper (scientific journal)  

DOI： 10.1149/2.1281614jes

Web of Science

Scopus

Language：Japanese   Publishing type：Research paper (scientific journal)  

DOI： 10.1149/2.1341607jes

Web of Science

Scopus

Language：English   Publishing type：Research paper (scientific journal)  

CiNii Research

Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)   Publisher：The Chemical Society of Japan  

Direct utilization of urine in fuel cells is a promising technology for conversion into electricity. Here, we report the design of anode materials for high-temperature direct urine fuel cells and the performance of a fuel cell with an optimized anode at 300 °C. The resultant peak power densities reached 16.7 mW cm⁻² for urine and 26.5 mW cm⁻² for urea.

DOI： 10.1246/cl.141067

Web of Science

Scopus

CiNii Research

Language：Japanese   Publishing type：Research paper (scientific journal)  

DOI： 10.1038/srep07903

Web of Science

Scopus

PubMed

Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Society for Human Environmental Studies  

The flexible job-shop scheduling problem has received considerable attention in the production scheduling field. Setup operators are inseparable from the system of a small-volume and widely diverse producing. The work load balance among setup operators is important to increase the satisfaction at work. In this paper, a diversity-oriented multi-objective island based genetic algorithm is proposed to solve the FJSP considering the setup operators as a constraint. The total tardiness of each product and the difference of the setup number between setup operators are regarded as objectives and optimized using the Pareto-based method. When the proposed GA is applied to a test instance with moderate size of the problem complexity, it obtained the two exact solutions within a few seconds. Results show that the proposed algorithm, which was applied to the realistic production planning of the model enterprise, improves diversity of sub-solutions and the local search performance by the introduction of the diversity-oriented evaluation of each island, and emigration strategy among islands.

DOI： 10.4189/shes.13.1

CiNii Research

Language：Japanese   Publishing type：Research paper (scientific journal)  

DOI： 10.1149/2.0581508jes

Web of Science

Scopus

Language：Japanese   Publishing type：Research paper (scientific journal)  

DOI： 10.1149/2.0611504jes

Web of Science

Scopus

Language：English   Publishing type：Research paper (scientific journal)   Publisher：The Chemical Society of Japan  

The effect of the addition of copper-doped bismuth–vanadium oxide to yttria-stabilized zirconia (YSZ) on the sinterability and electrical conductivity, especially in reducing atmospheres, has been investigated. When Bi₂Cu_0.1V_0.9O_5.35 was used as a sintering aid, the sintering temperature could be reduced to 800 °C, whereas the conventional sintering process requires temperatures above 1300 °C. Although the conductivity of YSZ with 1.5 mol % Bi₂Cu_0.1V_0.9O_5.35 was slightly lower than that of pure YSZ sintered at 1300 °C, no <I>P</I>_O₂ dependence was observed under reducing conditions (e.g., <I>P</I>_O₂ = 10⁻⁵–10⁻²⁴ atm), which indicates that the electrolyte is applicable to solid-oxide fuel cells.

DOI： 10.1246/cl.140712

Web of Science

Scopus

CiNii Research

Language：English   Publishing type：Research paper (scientific journal)  

Authorship：Lead author   Language：English   Publishing type：Research paper (other academic)  

DOI： 10.4172/2169-0022.s1.013

Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Information Processing Society of Japan (IPSJ)  

This paper describes the optimization of flexible job-shop scheduling problem (FJSP) in small and medium-sized companies with make-to-order (MTO) manufacturing many kinds of products. Incorporating weighted tardiness and set-up worker load balance to the objective function of the problem, we develop Genetic Algorithm (GA) using island model and a study of production data in real world make-to-order manufacturing type small business. Comparing the solutions by developed GA with the values obtained by prioritizing due date alone schedule such as EDD (Earliest due date), we confirm the effectiveness of the proposed method. In addition, we conduct numerical experiments on risk, which is general in the enterprise, and countermeasures by using this technique, and confirm that it is possible to quantitatively evaluate the effects. We suggest that the proposed method has potential to contribute to the business judgment in the make-to-order type small business with products and services by incorporating other objective functions

CiNii Research

Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Information Processing Society of Japan (IPSJ)  

This paper describes the optimization of flexible job-shop scheduling problem (FJSP) in small and medium-sized companies with make-to-order (MTO) manufacturing many kinds of products. Incorporating weighted tardiness and set-up worker load balance to the objective function of the problem, we develop Genetic Algorithm (GA) using island model and a study of production data in real world make-to-order manufacturing type small business. Comparing the solutions by developed GA with the values obtained by prioritizing due date alone schedule such as EDD (Earliest due date), we confirm the effectiveness of the proposed method. In addition, we conduct numerical experiments on risk, which is general in the enterprise, and countermeasures by using this technique, and confirm that it is possible to quantitatively evaluate the effects. We suggest that the proposed method has potential to contribute to the business judgment in the make-to-order type small business with products and services by incorporating other objective functions

CiNii Research

Language：Japanese   Publishing type：Research paper (scientific journal)  

DOI： 10.1109/SCIS-ISIS.2014.7044681

Scopus

Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Society for Human Environmental Studies  

Human societies are organized around cooperative and altruistic interactions. Natural selection, however, favors selfish and strong individuals who maximize their own resources at the expense of others. Although many previous studies with average payoffs have developed mechanisms for resolving the cooperation dilemma, they have a severe problem. Estimating the average values requires sufficient knowledge of the payoffs for all players in all public goods games (PGGs), which is difficult to achieve in practice. People make estimates every day based on insufficient knowledge. The transition probabilities ought to be therefore calculated based on known payoffs rather than on the average. Through this individual learning, we show that pool-punishers can overcome free-riders to establish stable cooperation within a society without help from non-participants or players using other strategies, even with a small multiplier (r) of public goods. This scenario requires the punishment that the free-riders receive to be greater than the cost to the pool-punishers. We also demonstrate that smaller population sizes and higher participation rates engender greater fixation probabilities for cooperation.

DOI： 10.4189/shes.12.181

CiNii Research

Language：English   Publishing type：Research paper (scientific journal)   Publisher：Molecular Genetics and Metabolism  

Citrin-deficient children and adolescents between adult-onset type II citrullinemia and neonatal intrahepatic cholestasis by citrin deficiency do not have clear clinical features except for unusual diet of high-fat, high-protein, and low-carbohydrate food. The aims of the present study are to characterize fatigue and quality of life (QOL) in citrin-deficient patients during adaptation and compensation stage, and to define the relationship between fatigue and QOL. The study subjects were 55 citrin-deficient patients aged 1-22. years (29 males) and 54 guardians. Fatigue was evaluated by self-reports and proxy-reports of the PedsQL Multidimensional Fatigue Scale. QOL was evaluated by the PedsQL Generic Core Scales. Both scale scores were significantly lower in child self-reports (p< 0.01 and p< 0.05, respectively) and parent proxy-reports (p< 0.01 and p< 0.01, respectively) than those of healthy children. Citrin-deficient patients with scores of 50 percentile or less of healthy children constituted 67.5% of the sample for the Fatigue Scale and 68.4% for the Generic Core Scales. The PedsQL Fatigue Scale correlated with the Generic Core Scales for both the patients (r = 0.56) and parents reports (r = 0.71). Assessments by the patients and their parents showed moderate agreement. Parents assessed the condition of children more favorably than their children. The study identified severe fatigue and impaired QOL in citrin-deficient patients during the silent period, and that such children perceive worse fatigue and poorer QOL than those estimated by their parents. The results stress the need for active involvement of parents and medical staff in the management of citrin-deficient patients during the silent period. © 2013 Elsevier Inc.

DOI： 10.1016/j.ymgme.2013.01.020

Scopus

Language：Japanese   Publishing type：Research paper (scientific journal)  

DOI： 10.1039/c3ta12707a

Web of Science

Scopus

Authorship：Lead author   Language：Japanese   Publishing type：Research paper (scientific journal)  

Language：Japanese   Publishing type：Research paper (scientific journal)  

DOI： 10.1002/anie.201202159

Web of Science

Scopus

PubMed

Language：Japanese   Publishing type：Research paper (scientific journal)  

DOI： 10.1002/anie.201205022

Web of Science

Scopus

PubMed

Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Japan Society of Civil Engineers  

Compact city is a promising urban form from a sustainability viewpoint, especially in developed countries. For urban planners, however, it is difficult to determine which areas should be expected to retreat and which should be concentrated. This paper discusses the morphology of an urban area after a retreat and concentration policy is implemented. The authors design and implement a genetic algorithm to determine areas that should retreat and those where concentration should occur to secure sustainability of a real local city. Changes in various indices related with Quality Of Life (QOL) and the urban forms that emerge are discussed. To evaluate this optimization technique, we focus on reducing maintenance expenses and improving the QOL within city government budget constraints. It is found that, in least maintenance cost option, people living in old houses/buildings or low land price areas may leave those districts and re-concentrate into areas where transport is convenient such as around train stations and national routes. In QOL maximization option, people living in the suburbs where transport is relatively inconvenient may move to more accessible areas. In medium option between least maintenance cost and most QOL, suburbs where land prices are low and where houses are old are the prior areas to retreat, followed by suburbs where transport is inconvenient. It is concluded that proposed optimization method, using a genetic algorithm for the evaluation of retreat and re-concentrate policies, is efficient and reliable.

DOI： 10.2208/jscejipm.68.i_339

CiNii Research

Language：Japanese   Publishing type：Research paper (scientific journal)  

CiNii Research

Language：Japanese   Publishing type：Research paper (other academic)  

Language：Japanese   Publishing type：Research paper (scientific journal)  

Fuel cells with a PtAu/C anode and a Pr-doped Mn2O3/C cathode were stacked without using a bipolar plate, and their discharge properties were investigated in a methanol aqueous solution bubbled with air. A three-cell stack exhibited a stack voltage of 2330 mV and a power output of 21 mW.

DOI： 10.1039/c1cc10493d

Web of Science

Scopus

PubMed

Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Japan Society of Energy and Resources  

The present study evaluated the optimized operation management of a cold air power system at a large-scale medical facility
during the summer, when the air-conditioning cold load reaches the annual maximum. The evaluation was conducted with
respect to energy costs, CO₂ emissions and robustness of the energy-supply system. Since there are a large number of
possible solutions as to which machines and which refrigeration levels should be operated, a genetic algorithm (GA) was
used to obtain approximate, applicable solutions stochastically, to determine a daily plan of operation for the refrigeration
system in a timely manner. According to the operation management plan obtained from the GA, over 10% of the energy costs
and the CO₂ emissions can be reduced by improved operation. The stability of the cold air power system when a large-sized
photovoltaic system is installed or when one of the refrigeration units breaks down can also be evaluated by using the GA. In
a medical faculty we taken up, the estimated reduction in CO₂ by adopting the photovoltaic system was calculated to be about
16% compared to the current operation management plan. And also the stability of present energy-supply system was
validated except for when the vapor-absorption-type refrigerator was down.

DOI： 10.24778/jjser.32.5_24

CiNii Research

Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Energy and Environmental Science  

Fuel cells for vehicular and residential applications have encountered a key technical challenge in cost reduction. This challenge can be avoided by operating a fuel cell stack without the use of gas separators, which are expensive and voluminous and therefore comprise a significant portion of the cost of a fuel cell stack. Single-chamber fuel cells (SCFCs) have the potential of realizing such operation, because there is no need for separation between fuel and air. In this paper, we present a selective anode (PtAu/C) and cathode (Pr-doped Mn2O3/C) for respective electrochemical hydrogen oxidation and oxygen reduction reactions in a SCFC. A single cell with these electrodes operated at 50 °C generated an open-circuit voltage of 1204 mV and a peak power density of 50 mW cm-2 in a feed mixture of 80% hydrogen and 20% air at a flow rate of 30 mL min-1. The high selectivity of these electrodes also enabled the design of two different separator-free fuel cell stacks, parallel and perpendicular to the gas stream. Both cell stacks exhibited increasing stack voltage and power output almost proportionally to the increase in the number of single cells. These results demonstrate that the separator-free fuel cell stack shows high potential for a significant reduction of the cost of fuel cell systems. © The Royal Society of Chemistry.

DOI： 10.1039/c0ee00288g

Web of Science

Scopus

Language：Japanese   Publishing type：Research paper (other academic)  

Language：English   Publishing type：Research paper (other academic)  

Language：Japanese   Publishing type：Research paper (other academic)  

今後世界的な問題となることが危惧されている水環境問題の解決策として、下水の適正処理が行われる条件をシステムダイナミクスの手法を用いて導出した。本モデルで越流の予測とその程度の評価を行うことができた。

Language：Japanese   Publishing type：Research paper (scientific journal)  

DOI： 10.1002/fuce.200800017

Web of Science

Scopus

Language：Japanese   Publishing type：Research paper (scientific journal)  

DOI： 10.1016/j.ssi.2008.03.033

Web of Science

Scopus

Language：Japanese   Publishing type：Research paper (scientific journal)  

DOI： 10.1016/j.ssi.2007.12.090

Web of Science

Scopus

Language：Japanese   Publishing type：Research paper (scientific journal)  

DOI： 10.1149/1.2803509

Web of Science

Scopus

Language：Japanese   Publishing type：Research paper (scientific journal)  

DOI： 10.1149/1.2897758

Web of Science

Scopus

Language：English   Publishing type：Research paper (scientific journal)  

CiNii Research

Language：English   Publishing type：Research paper (scientific journal)  

CiNii Research

Language：English   Publishing type：Research paper (scientific journal)  

CiNii Research

Language：English   Publishing type：Research paper (scientific journal)  

CiNii Research

Language：English   Publishing type：Research paper (scientific journal)  

Heat engines emit huge amounts of exhaust which contain considerable quantities of heat and chemical energies. An increasing public awareness of global warming and oil depletion has required the development of innovative methods of recovering energy from such exhaust. A promising approach is to produce electricity from unburned fuel by using a fuel cell system. The exhaust includes cracked-light hydrocarbons, offering the possibility of applying this system to a power generator. Solid oxide fuel cells (SOFCs) can work at elevated temperatures but have poor thermal and mechanical shock resistance. In this study, we address this problem by operating the fuel cell system in a single-chamber mode, wherein no separation between fuel and oxidant gases is required. This operation provides high tolerance toward thermal cycling and breakage of the electrolyte. As a result, a twelve-cell stack exhibits stable and high performance in the exhaust from a motorcycle.

Language：Japanese   Publishing type：Research paper (scientific journal)  

DOI： 10.1016/j.jcat.2007.02.001

Web of Science

Scopus

Language：English  

A proton conducting, 10 mol% In3+-doped SnP2O7 was characterized by TGA, TEM measurement, and electrochemical techniques. We prepared Sn0.9In0.1P2{plus minus}xO7{plus minus}x samples with various P/(Sn+In) molar ratios from 1.7 to 2.6. Sn0.9In0.1P2O7 with a stoichiometric P/(Sn+In) molar ratio of 2.0 showed a proton conductivity of about 0.19 S cm-1 at 250oC under unhumidified conditions. When the P/(Sn+In) molar ratios were over 2.0, amorphous layer composed of phosphorus compounds were observed over the surface of Sn0.9In0.1P2O7 particles. The proton conductivity slightly increased with increasing the P/(Sn+In) molar ratios from 2.0 to 2.6. It is considered that the amorphous layer enhanced the proton conductivity by surface conduction. On the other hand, the thermal stability of this amorphous layer during heating-cooling cycle was not enough high to apply to electrochemical devises. It is important to prepare Sn0.9In0.1P2O7 with the P/(Sn+In) molar ratio of 2.0 to achieve both sufficient proton conductivity and high thermal stability.

Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Journal of the Electrochemical Society  

Anode performance of non-Pt catalysts for hydrogen oxidation was investigated in intermediate-temperature proton exchange membrane fuel cells. Molybdenum carbide (Mo2 C) showed the highest catalytic activity among the transition metal carbides tested. Furthermore, the catalytic activity of Mo2 C was significantly improved by the addition of ZrO2 to the anode. Transmission electron microscopy and X-ray diffraction measurements revealed that Mo2 C was more highly dispersed in the Mo2 C- ZrO2 C than in the Mo2 CC, suggesting that the particle growth of Mo2 C was suppressed by the addition of ZrO2. We also tested the performance of a fuel cell using Mo2 C- ZrO2 C and Sn0.9 In0.1 P2 O7 as the anode and electrolyte materials, respectively, between 150 and 300°C. At 250°C or higher, the Mo2 C- ZrO2 C anode showed a cell performance comparable to that of the PtC anode. However, cell performance was strongly dependent on the operating temperature, reflecting that the catalytic activity of Mo2 C- ZrO2 was greatly lowered by the decrease in operating temperature. Thus it was concluded that the Mo2 C- ZrO2 catalyst is a promising alternative anode material to Pt, especially at intermediate temperatures. © 2006 The Electrochemical Society.

DOI： 10.1149/1.2382268

Web of Science

Scopus

Language：Japanese   Publishing type：Research paper (scientific journal)  

DOI： 10.1149/1.2789296

Web of Science

Scopus

Language：Japanese   Publishing type：Research paper (scientific journal)  

DOI： 10.1149/1.2713702

Web of Science

Scopus

Language：Japanese   Publishing type：Research paper (scientific journal)  

DOI： 10.1149/1.2388737

Web of Science

Scopus

Language：Japanese   Publishing type：Research paper (scientific journal)  

DOI： 10.1149/1.2747326

Web of Science

Scopus

Language：English   Publishing type：Research paper (scientific journal)  

CiNii Research

Language：English   Publishing type：Research paper (scientific journal)  

CiNii Research

Language：Japanese   Publishing type：Research paper (scientific journal)  

DOI： 10.1149/1.2159298

Web of Science

Scopus

Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：ECS Transactions  

A proton conducting, 10 mol% In3+-doped SnP2O 7 (Sn0.9In0.1 P2O7) was characterized by thermogravimetric analysis (TGA), transmission electron microscope (TEM) measurement, and electrochemical techniques. We prepared Sn0.9In0.1P2=x07±x samples with various P/(Sn+In) molar ratios from 1.7 to 2.6 through the control of the amount of phosphoric acid at the preparation process in order to examine electrochemical properties and thermal stabilities. Sn0.9In 0.1P2O7 with a stoichiometric P/(Sn+In) molar ratio of 2.0 showed a proton conductivity of about 0.19 S cm-1 at 250°C under unhumidified conditions. When the P/(Sn+In) molar ratios were over 2.0, the formation of amorphous layer composed of phosphorus compounds were observed over the surface of Sn0.9In0.1P 2O7 particles. The proton conductivity slightly increased with increasing the P/(Sn+In) molar ratios from 2.0 to 2.6. It is considered that the amorphous layer enhanced the proton conductivity by surface conduction. On the other hand, the thermal stability of this amorphous layer during heating-cooling cycle was not enough high to apply to electrochemical devises. As a result, it is important to prepare Sn0.9In0.1P 2O7 with the P/(Sn+In) molar ratio of 2.0 to achieve both sufficient proton conductivity and high thermal stability. Copyright The Electrochemical Society.

DOI： 10.1149/1.2408942

Scopus

Language：Japanese   Publishing type：Research paper (scientific journal)  

DOI： 10.1149/1.2210669

Web of Science

Scopus

Language：Japanese   Publishing type：Research paper (scientific journal)  

DOI： 10.1149/1.2183927

Web of Science

Scopus

Language：Japanese   Publishing type：Research paper (scientific journal)  

DOI： 10.1149/1.2193073

Web of Science

Scopus

Language：Japanese   Publishing type：Research paper (scientific journal)  

DOI： 10.1149/1.2149213

Web of Science

Scopus

Language：Japanese   Publishing type：Research paper (scientific journal)  

DOI： 10.1149/1.2186184

Web of Science

Scopus

Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：ECS Transactions  

Proton exchange membrane fuel cells (PEMFCs) are among the most promising power sources for vehicular and residential applications because of their clean and efficient energy conversion. However, these fuel cells require expensive Pt-based electrodes, which raise the cost of fuel-cell systems considerably. Here, we propose an approach to solving this problem by combining a molybdenum carbide (Mo2C) catalyst with an In3+-doped SnP 2O7 electrolyte. The resulting fuel cell can operate in the temperature range of 150 to 300°C, providing the high catalytic activity of Mo2C for electrochemical hydrogen oxidation, which is comparable to that of a Pt anode catalyst. Another important advantage of this fuel cell is that the Mo2C anode catalyst showed perfect tolerance to 10%CO. copyright The Electrochemical Society.

DOI： 10.1149/1.2356166

Scopus

Language：English   Publishing type：Research paper (scientific journal)  

CiNii Research

Language：English   Publishing type：Research paper (scientific journal)  

CiNii Research

Language：English   Publishing type：Research paper (scientific journal)  

CiNii Research

Language：English   Publishing type：Research paper (scientific journal)  

CiNii Research

Authorship：Lead author   Language：Japanese   Publishing type：Part of collection (book)  

200度程度で作動するプロトン導電体に関する報告を中心に、世界の開発動向をまとめた総説である。

Language：English   Publishing type：Research paper (scientific journal)  

Single-chamber solid oxide fuel cells (SOFCs) with an anode-supported Ce0.9Gd0.1O1.95 electrolyte were operated in a mixture of butane and air at furnace temperatures of 200-300°C. The electromotive force (emf) of the cell and the voltage drop were strongly influenced by the catalytic activity of the anode for the partial oxidation of butane. The promotion of hydrogen formation by the addition of Ru to the anode caused an increase in the emf and a reduction in the voltage drop. As a result, stable power densities of 44 and 176 mW cm–2 were obtained at 200 and 300°C, respectively.

Language：English   Publishing type：Research paper (scientific journal)  

A method that can block off electronic current through a samaria-doped ceria (SDC, Ce0.8Sm0.2O1.9) electrolyte is proposed. A thin BaCeO3-based layer 12 &micro;m thick was grown by a solid-state reaction of the electrolyte substrate and a BaO film deposited previously over the substrate surface at 1500°C. A homogeneous junction between the layer and the electrolyte was formed, thus allowing no delamination and cracking of the layer. Tolerance of this layer to CO2 was high enough to suppress decomposition into BaCO3 and CeO2. Open-circuit voltages of a hydrogen-air fuel cell with the coated SDC electrolyte were near 1 V or more in the range of 600-950°C. The resulting peak power density was higher than that of a fuel cell with an uncoated SDC electrolyte.

Language：English   Publishing type：Research paper (scientific journal)  

We proposed a new type of solid oxide fuel cell (SOFC) operating without using an anode material, where the anode was spontaneously formed by reduction of the electrolyte surface under reducing gas conditions. A BaCe0.76Y0.20Pr0.04O3−α electrolyte most successfully met this criterion. This material showed high mixed protonic–electronic conduction, whereas the open circuit voltage (OCV) of the cell was slightly lower than the theoretical value. The resulting SOFC exhibited reasonable fuel cell performances together with a good stability to thermal and redox cyclings and high resistance to carbon deposition up to 800 °C for dry methane, ethane, and propane.

Author Keywords: Solid oxide fuel cells; BaCe0.76Y0.20Pr0.04O3−α; Anode material

Language：English   Publishing type：Research paper (scientific journal)  

Event date： 2009.5

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2008.3

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

無機化学基礎

環境・エネルギー関連施設を訪問

実験

化学実験

基礎無機化学