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Microstructural Engineering of Heterogeneous P−S−Co Interface for Oxygen and Hydrogen Evolution
Author(s) -
Yu Xiaoguang,
Li Na,
Wang Wenquan,
Li Longfei,
Yao Meiyang,
Tian Wentao,
Guo Xiaosong,
Li Guicun
Publication year - 2019
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.201900709
Subject(s) - overpotential , tafel equation , heterojunction , electrochemistry , oxygen evolution , cobalt , catalysis , cobalt sulfide , materials science , microstructure , chemical engineering , phosphide , chemistry , nanotechnology , inorganic chemistry , electrode , optoelectronics , composite material , biochemistry , engineering
Fabricating and engineering heterointerface was an effective approach to improve electrochemical activity of catalysts through modulating their atomic arrangement and chemical states. Herein, cobalt phosphide and cobalt sulfide (CoP/CoS x ) heterostructure hollow nanocones were fabricated by an in situ ion intercalation template‐assisted method. The microstructure of the heterointerface could be adjusted by changing the molar ratio of S/P. Electrochemical investigation revealed that the disordered structures at the heterointerface could influence the catalytic behavior of active sites. Rationally engineering the disordered structure could improve the electrocatalytic activity for oxygen and hydrogen evolution reactions (OER/HER). The optimized CoP/CoS x heterostructure exhibited favorable catalytic activity for OER, which delivered an overpotential at 10 mA cm −2 of 313 mV and a Tafel slope (93 mV dec −1 ) in alkaline media. Meanwhile, the optimized CoP/CoS x heterostructure also exhibited superior HER performance under acidic condition.