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Coupled Vacancy Pairs in Ni‐Doped CoSe for Improved Electrocatalytic Hydrogen Production Through Topochemical Deintercalation
Author(s) -
Zhong Wenwu,
Wang Zongpeng,
Gao Nan,
Huang Liangai,
Lin Zhiping,
Liu Yanping,
Meng Fanqi,
Deng Jun,
Jin Shifeng,
Zhang Qinghua,
Gu Lin
Publication year - 2020
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.202011378
Subject(s) - vacancy defect , heteroatom , doping , materials science , intercalation (chemistry) , atomic orbital , graphene , crystallography , chemistry , chemical physics , inorganic chemistry , nanotechnology , optoelectronics , ring (chemistry) , physics , organic chemistry , quantum mechanics , electron
Vacancy engineering plays vital role in the design of high‐performance electrocatalysts. Here, we introduced coupled cation‐vacancy pairs in Ni‐doped CoSe to achieve boosted hydrogen evolution reaction (HER) activity through a facile topochemical intercalation approach. Adjacent Co vacancy pairs and heteroatom Ni doping contribute together for the upshift of the Se 4p z orbital, which induces larger overlap between the Se 4p and H 1s orbitals. As a result, the free energy of H adsorption can be lowered significantly. With an advanced HER activity of 185.7 mV at 10 mA cm −2 , this work provides new direction and guidance for the design of novel electrocatalysts.