Coupled Vacancy Pairs in Ni‐Doped CoSe for Improved Electrocatalytic Hydrogen Production Through Topochemical Deintercalation. Issue 50 (7th October 2020)

• Record Type: Journal Article
• Authors: Zhong, Wenwu; Wang, Zongpeng; Gao, Nan; Huang, Liangai; Lin, Zhiping; Liu, Yanping; Meng, Fanqi; Deng, Jun; Jin, Shifeng; Zhang, Qinghua; Gu, Lin
• Is Part Of: Angewandte Chemie international edition. Volume 59:Issue 50(2020)
• Page Start: 22743
• Page End: 22748
• Publication Date: 2020-10-07
• Subjects: CoSe -- coupled vacancy pairs -- doping -- hydrogen evolution reaction; Chemistry -- Periodicals; 540
• DOI: 10.1002/anie.202011378
• Languages: English
• ISSNs: 1433-7851

Abstract

Abstract: 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. Abstract : The HER activity of CoSe is considerably improved by engineering the Co vacancies through Ni doping. A low overpotential of 185.7 mV at 10 mA cm −2 is observed, which can be attributed to the upshift of sp orbitals.