文献类型：期刊文献

英文题名：Surface Reconstruction of La0.8Sr0.2Co0.8Fe0.2O3-δ for Superimposed OER Performance

作者：Zhao, Chunhua[1];Li, Nan[1];Zhang, Ruizhi[1];Zhu, Zhaoqiang[1];Lin, Jiahao[1];Zhang, Kefu[1];Zhao, Chongjun[1]

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

年份：2019

卷号：11

期号：51

起止页码：47858

外文期刊名：ACS APPLIED MATERIALS & INTERFACES

收录：;EI(收录号：20195107885814);WOS:【SCI-EXPANDED(收录号:WOS:000505626900019)】；

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

语种：英文

外文关键词：surface reconstruction; La0.8Sr0.2Co0.8Fe0.2O3-delta; oxygen evolution reaction (OER); amorphous layer; nanosized

摘要：Perovskites have become important OER electrocatalysts. Herein, as-prepared La0.8Sr0.2Co0.8Fe0.2O3-delta (LSCF-0) is chosen as a sample to exhibit the superimposed effect of surface reconstruction accompanied by reduction of Co3+ to Co2+ on the further improvement of its activity and stability. As-synthesized LSCF-0 perovskite is chemically treated by simply immersing in an aqueous solution of NaBH4 for 1.0 h at room temperature. The optimized LSCF (LSCF-2) owns an amorphous layer consisting of nanosized particles of similar to 20 nm (vs smooth bulk crystalline surface for untreated LSCF), which exhibits superior OER performance to LSCF-0. LSCF-2 has an overpotential of 248 mV (10 mA cm(-2)) and a Tafel slope of 51 mV dec(-1) (vs 355 mV and 76 mV dec(-1) for LSCF-0 and 381 mV and 91 mV dec(-1) for LCO) and an excellent cycle stability for 20 h running. This work supplies a new strategy to enhance OER performance through surface reconstruction of as-prepared perovskites.