Surface manipulation of a triple-conducting cathode for protonic ceramic fuel cells to enhance oxygen reduction activity and CO_(2) tolerance  

作　　者：Wenwen Zhang Hiroki Muroyama Yuichi Mikami Toshiaki Matsui Koichi Eguchi 

机构地区：[1]Department of Energy and Hydrocarbon Chemistry,Graduate School of Engineering,Kyoto University,Nishikyo-ku,Kyoto 615-8510,Japan [2]Technology Division,Panasonic Holdings Corporation,3-1-1 Yagumo-naka-machi,Moriguchi City,Osaka 570-8501,Japan

出　　处：《Journal of Energy Chemistry》2023年第12期450-459,I0012,共11页能源化学（英文版）

基　　金：partially based on results obtained from projects, Development of Ultra-High Efficiency Protonic Ceramic Fuel Cell Devices, WP1 Development of Innovative High-Performance Electrodes, JPNP20003, commissioned by the New Energy and Industrial Technology Development Organization (NEDO);supported by Grant-in-Aid for Japan Society for the Promotion of Science (JSPS) Postdoctoral Fellowships for Research in Japan (JP21F20736)。

摘　　要：One of the main obstacles limiting the performance of protonic ceramic fuel cells(PCFCs) is the sluggish kinetics of the oxygen reduction reaction(ORR) at reduced temperatures.Here,the surface manipulation of a triple-conducting cathode BaCe_(0.5)Pr_(0.3)Y_(0.2)O_(3-δ)(BCPY) by an efficient catalyst coating PrNi_(0.5)Co_(0.5)O_(3-δ)(PNC) to enhance the ORR activity and CO_(2) tolerance is reported.The developed PNC-coated BCPY cathode achieves the polarization resistance of 0.25 and 1.00 Ω cm^(2) at 600 and 500 ℃,respectively,approximately 1/5 of that for the pristine BCPY cathode(0.99 and 4.79 Ω cm^(2)),while maintaining an excellent CO_(2) tolerance.The single cell on a BaZr_(0.8)Yb_(0.2)O_(3-δ) electrolyte also exhibits a high peak power density of 0.79 W cm^(-2)at 700 ℃ and a stable operation for 200 h at 600 ℃.Such high ORR activity is mainly attributed to the synergistic effect of BCPY support and PNC nanoparticles.Namely,BCPY provides a tripleconducting path(mainly protons),and PNC nanoparticles facilitates surface oxygen exchange and steam adsorption/desorption processes due to the enriched surface oxygen vacancies.This study will provide a new design strategy for developing high-performance PCFCs cathode.

关 键 词：Triple-conducting cathode Surface manipulation Oxygen reduction reaction CO_(2)tolerance Protonic ceramicfuel cells 

分 类 号：TM911.4[电气工程—电力电子与电力传动]