Theoretical and Experimental Investigations on K-doped SrCo0.9Nb0.1O3-δ as a Promising Cathode for Proton-Conducting Solid Oxide Fuel Cells

被引：54

作者：

Zhu, Kang ^{[1
]}

Yang, Yi ^{[1
]}

Huan, Daoming ^{[1
]}

Hu, Xueyu ^{[1
]}

Shi, Nai ^{[1
]}

Xie, Yun ^{[1
]}

Li, Xinyu ^{[1
]}

Xia, Changrong ^{[1
]}

Peng, Ranran ^{[1
,2
,3
]}

Lu, Yalin ^{[1
,2
,3
,4
]}

机构：

[1] Univ Sci & Technol China, Dept Mat Sci & Engn, CAS Key Lab Mat Energy Convers, 96 Jinzhai Rd, Hefei 230026, Anhui, Peoples R China

[2] Univ Sci & Technol China, Synerget Innovat Ctr Quantum Informat & Quantum P, 96 Jinzhai Rd, Hefei 230026, Anhui, Peoples R China

[3] Univ Sci & Technol China, Hefei Natl Lab Phys Sci Microscale, 96 Jinzhai Rd, Hefei 230026, Anhui, Peoples R China

[4] Univ Sci & Technol China, Anhui Lab Adv Photon Sci & Technol, 96 Jinzhai Rd, Hefei 230026, Anhui, Peoples R China

来源：

CHEMSUSCHEM | 2021年 / 14卷 / 18期

基金：

中国国家自然科学基金;

关键词：

cathodes; density functional theory calculations; hydration; proton migration; solid oxide fuel cell; HIGH-PERFORMANCE; MOLECULAR-DYNAMICS; PEROVSKITES; SOFCS;

D O I：

10.1002/cssc.202101100

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Improving proton conduction in cathodes is regarded as one of the most effective methods to accelerate the sluggish proton-involved oxygen reduction reaction (P-ORR) for proton-conducting solid oxide fuel cells (P-SOFCs). In this work, K+ dopant was used to improve the proton uptake and migration ability of SrCo0.9Nb0.1O3-delta (SCN). K+-doped SCN (KSCN) demonstrated great potential to be a promising cathode for P-SOFCs. Density functional theory calculations suggested that doping with K+ led to more oxygen vacancies and more negative values of hydration enthalpy, which was helpful for the improvement of proton concentration. Importantly, the proton migration barriers could be depressed, benefiting proton conduction. Electrochemical investigations signified that the cell using KSCN cathode had a peak power density of 967 mW cm(-2) at 700 degrees C, about 54.1 % higher than that using a SCN cathode. This research highlights the K+-doping strategy to improve electrochemical performance of cathodes for P-SOFCs.

引用

页码：3876 / 3886

页数：11

共 45 条

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