材料科学
非阻塞I/O
阴极
极化(电化学)
氧化物
电化学
电解质
耐久性
离子电导率
化学工程
复合材料
纳米技术
电极
冶金
催化作用
电气工程
物理化学
化学
工程类
生物化学
作者
Yuanfeng Zou,Zhongwei Yue,Shuai He,Zhishan Li,Zhiyi Chen,Na Ai,Xiao Sun,William D.A. Rickard,Meiting Guo,San Ping Jiang,Kongfa Chen
标识
DOI:10.1021/acsami.3c07868
摘要
Ruddlesden–Popper oxide La2NiO4+δ (LNO) has a high ionic conductivity and good thermal match with the electrolyte of solid oxide fuel cells (SOFCs); however, LNO suffers from performance decay owing to the La surface segregation under the operation conditions of SOFCs. Herein, we report an in situ electrochemical decoration strategy to improve the electrocatalytic activity and durability of LNO cathodes. We show that the electrochemical polarization leads to in situ construction of the LNO@Pt core–shell structure, significantly suppressing the detrimental effect of La surface segregation on the LNO cathode. The initial peak power density of a single cell with the LNO cathode is 0.71 W cm–2 at 750 °C, increasing to 1.39 W cm–2 by the in situ construction of the LNO@Pt core–shell structure after polarization at 0.5 A cm–2 for 20 h. The LNO@Pt core–shell structure is also highly durable without noticeable performance degradation over the duration of the test for 180 h. The findings shed light on the design and fabrication of highly active and durable LNO-based cathodes for SOFCs.
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