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

页码：19102 / 19112

页数：11

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