Measurement of oxygen reduction/evolution kinetics enhanced (La,Sr)CoO3/(La,Sr)2CoO4 hetero-structure oxygen electrode in operating temperature for SOCs

被引：13
作者：
Zhao, Chenhuan [1 ]
Liu, Xuegang [1 ]
Zhang, Wenqiang [1 ]
Zheng, Yun [1 ]
Li, Yifeng [1 ]
Yu, Bo [1 ]
Wang, Jianchen [1 ]
Chen, Jing [1 ]
机构：
[1] Tsinghua Univ, Inst Nucl & New Energy Technol, Collaborat Innovat Ctr Adv Nucl Energy Technol, Beijing 100084, Peoples R China
来源：
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY | 2019年 / 44卷 / 35期
关键词：
SOC; Oxygen electrode; Hetero-structure; ORR/OER kinetics; SURFACE EXCHANGE KINETICS; FUEL-CELL CATHODE; THIN-FILMS; CHEMICAL CAPACITANCE; CATALYTIC-ACTIVITY; SOFC CATHODES; METAL-OXIDES; CO; PEROVSKITES; PERFORMANCE;
D O I：
10.1016/j.ijhydene.2018.04.128
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
To make full use of the advantages of solid oxide cells (SOCs) under actual operating conditions, hetero-structured La0.6Sr0.4CoO3-delta/LaSrCoO4 +/-delta (LSC113/214) thin film electrodes are prepared and investigated by a novel high temperature micro-probe electrochemical test platform for SOCs. The results show that the surface exchange coefficient (k(q)) of LSC113/214 thin films is 3-10 times higher than that of single phase LSC113 in 773-1123 K. ToF-SIMS and XPS characterizations show that LSC113/214 hetero-interface leads to Sr enrichment at interfacial region and stabilizes it against detrimental Sr segregation. This hetero-interface further induces increased number of active oxygen vacancies and leads to accelerated oxygen exchange kinetics by raising O 2p center closer to Fermi level. This work provides significantly enhanced ORR/OER activity of hetero-structured LSC113/214 oxygen electrode at operation conditions and brings substantial technical benefits for the SOC systems. (C) 2018 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：19102 / 19112
页数：11
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