標題: Operando Spectral and Electrochemical Investigation into the Heterophase Stimulated Active Species Transformation in Transition-Metal Sulfides for Efficient Electrocatalytic Oxygen Evolution
作者: Wang, Miao
Dong, Chung-Li
Huang, Yu-Cheng
Shen, Shaohua
交大名義發表
National Chiao Tung University
關鍵字: oxygen evolution reaction;cobalt sulfides;operando Raman spectroscopy;operando X-ray absorption spectroscopy;active species transformation
公開日期: 7-二月-2020
摘要: In-depth understanding of electrocatalytically active species transformation during oxygen evolution reaction (OER) is highly guidable to design effective electrocatalysts for water splitting. Herein, cobalt sulfide (CoSx) nanovesicles decorated with iron sulfide (FeSx) heterophases were successfully synthesized by using a metal-organic framework precursor through a solvothermal method. The obtained CoSx/FeSx exhibited much elevated OER activity as compared to pristine CoSx and even most previously reported cobalt-based electrocatalysts, with the overpotential of 304 mV at 10 mA cm(-2) in 1 M KOH. As revealed by operando Raman and X-ray absorption spectroscopy measurements, the electrocatalytically active species transformation in CoSx nanovesicles could be stimulated by the incorporated FeSx heterophases due to the increased average valence state of cobalt and lowered coordination of cobalt sites. As a result, the electrocatalytically active cobalt oxyhydroxides could be more easily formed on the catalyst surface during OER and thus contributed to the highly improved performance. This real-time spectral and electrochemical insight into the electrocatalytically active species transformation may guide the rational design of highly efficient electrocatalysts for water splitting from the viewpoint of electronic structure-electrocatalytic activity relationship.
URI: http://dx.doi.org/10.1021/acscatal.9b05170
http://hdl.handle.net/11536/153873
ISSN: 2155-5435
DOI: 10.1021/acscatal.9b05170
期刊: ACS CATALYSIS
Volume: 10
Issue: 3
起始頁: 1855
結束頁: 1864
顯示於類別:期刊論文