1999年7月
Effect of the steam-methane ratio on reactions occurring on Ni/yttria-stabilized zirconia cermet anodes used in solid-oxide fuel cells
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
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- 巻
- 146
- 号
- 7
- 開始ページ
- 2481
- 終了ページ
- 2487
- 記述言語
- 英語
- 掲載種別
- DOI
- 10.1149/1.1391959
- 出版者・発行元
- ELECTROCHEMICAL SOC INC
Power-generation experiments of solid-oxide fuel cells with Ni/yttria-stabilized zirconia cermet anodes were carried out by changing the water-to-methane ratio in the fuel. To separate the electrochemical reactions occurring on the three-phase boundary of the anode from the steam-reforming reactions, premixed gases corresponding to the composition at thermal equilibrium were used as the fuel. The reactions on the anode were quantitatively clarified at different steam-to-methane ratios by making a mass balance of the elements and electrons and by determining the anode exit gas composition. For dry (i.e., no water) methane fuel, the carbon deposited on the three-phase boundary from the methane mainly reacted with oxide ions (O2-). With increasing steam-carbon (S/C) ratio from S/C = 0.5 to 1, hydrogen became the dominant reactant. The anode potential vs, current density for S/C = 1 agreed with that for hydrogen diluted with argon. At S/C ratios higher than 1.5, CO in the inlet gas reacted with oxide ions. (C) 1999 The Electrochemical Society. S0013-4651(98)10-068-X. All rights reserved.
- リンク情報
- ID情報
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- DOI : 10.1149/1.1391959
- ISSN : 0013-4651
- Web of Science ID : WOS:000081652700017