文献类型：期刊文献

英文题名：Direct Regulation of Double Cation Defects at the A1A2 Site for a High-Performance Oxygen Evolution Reaction Perovskite Catalyst

作者：Li, Nan[1];Guo, Jingjia[1];Ding, Yiwen[1];Hu, Yaqi[1];Zhao, Chunhua[1];Zhao, Chongjun[1]

机构：[1]East China Univ Sci & Technol, Sch Mat Sci & Engn, Key Lab Ultrafine Mat, Minist Educ, Shanghai 200237, Peoples R China

年份：2021

卷号：13

期号：1

起止页码：332

外文期刊名：ACS APPLIED MATERIALS & INTERFACES

收录：;EI(收录号：20210209763090);WOS:【SCI-EXPANDED(收录号:WOS:000611066000028)】；

基金：We are grateful for the support of the Natural Science Foundation of Shanghai (nos. 19NR1413000, 13ZR1411900), Shanghai Alliance Plan (nos. LM201881, LM201751), Shanghai Leading Academic Discipline Project (B502), and Shanghai Key Laboratory Project (08DZ2230500). We also thank the Research Center of Analysis and Test of East China University of Science and Technology for the help on the characterization.

语种：英文

外文关键词：double cation defects; perovskite; oxygen evolution reaction (OER); oxygen vacancy; oxidation state

摘要：Perovskites are one of the efficient catalysts for the oxygen evolution reaction (OER), and they belong to the primary ABO(3) in which the A site and B site are site-substituted, and oxygen vacancies are introduced. Further improvement of these complex perovskites is the next necessary topic for specific applications. Herein, two complex perovskites, La0.6Sr0.4Co0.8Fe0.2O3-delta (LSCF) and Ba0.5Sr0.5C0.05Fe0.2O3-delta (BSCF), are exploited as the examples to demonstrate the double cation defectsintroduced method of A1 and A2 to supply superimposed enhancement of the activity and stability. This is based on the fact that the increased content of oxygen vacancies and coordination can balance the oxygen vacancy and B-site element oxidation state. The electrochemical measurements revealed that the optimized A-LSCF10 and A-BSCF10 both exhibit outstanding OER catalytic activity. A small Tafel slope (57 mV dec(-1)) and a low overpotential (228 mV at 10 mA cm(-2)) for A-LSCF10 (vs 93 mV dec(-1) and 345 mV at 10 mA cm(-2) for A-LSCFO), and a small Tafel slope (65 mV dec(-1) and an overpotential (242 mV at 10 mA cm(-2)) for A-BSCF10 (vs 66 mV dec(-1) and 308 mV at 10 mA cm(-2). for A-BSCFO) are determined, as well as good stability for 24 h.