Leakage current and chemical potential profile in proton-conducting bi-layered solid oxide electrolyte with Bzy and hole-blocking layers

Y. Matsuzaki, Y. Tachikawa, Y. Baba, K. Sato, H. Iinuma, G. Kojo, H. Matsuo, J. Otomo, H. Matsumoto, S. Taniguchi, K. Sasaki

研究成果: Chapter in Book/Report/Conference proceedingConference contribution

抄録

Solid oxide fuel cells (SOFCs) with proton-conducting solid electrolyte, instead of the oxide-ion conducting solid electrolyte have attracted attentions because of their high potential to reduce operating temperatures and to enhance the electrical efficiencies of SOFCs. In addition, the proton-conducting SOFCs with multistage electrochemical oxidation configuration will be promising technology for critically-high electric efficiencies. However, it is known that there are non-negligible charge -carriers other than protons in typical proton-conducting solid oxide electrolytes at relatively high temperatures. The existence of the partial conductivities of holes and/or electrons will cause the internal leakage current that consumes fuel but never generates any electrical power output. The higher ratio of the leakage current to external current will more deteriorate the electrical efficiency. In this study, the effects of blocking -layers formed on the air side surface of base electrolyte layer consisting of BaZr0.8Y0.2O3-δ (BZY82) for suppressing the leakage current have been investigated by using electrochemical parameters of the partial conduction of the materials. The chemical potential profile and leakage current showed large dependence on the material of the blocking -layer. Lanthanum tungstate was found to play a role as unique and strong blocking -layer against the leakage current.

本文言語英語
ホスト出版物のタイトルSolid Oxide Fuel Cells 16, SOFC 2019
編集者K. Eguchi, S. C. Singhal
出版社Electrochemical Society Inc.
ページ1009-1018
ページ数10
1
ISBN(電子版)9781607688747
DOI
出版ステータス出版済み - 1 1 2019
イベント16th International Symposium on Solid Oxide Fuel Cells, SOFC 2019 - Kyoto, 日本
継続期間: 9 8 20199 13 2019

出版物シリーズ

名前ECS Transactions
番号1
91
ISSN(印刷版)1938-6737
ISSN(電子版)1938-5862

会議

会議16th International Symposium on Solid Oxide Fuel Cells, SOFC 2019
Country日本
CityKyoto
Period9/8/199/13/19

All Science Journal Classification (ASJC) codes

  • Engineering(all)

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