Journal
ACS APPLIED ENERGY MATERIALS
Volume 4, Issue 4, Pages 2976-2982Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsaem.1c00212
Keywords
cobalt chalcogenide; heteroatom defects; Se substitution; hollow spheres; water reduction
Funding
- Innovation-Driven Project of Central South University [2019CX028]
- Huxiang Assembly Program for High-Level Talents (Hunan province of China) [2018RS3018]
- [202045001]
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The cobalt binary chalcogenide hollow spheres with sulfur defects prepared by selenium substitution demonstrated enhanced electrocatalytic performance for water reduction, leading to low overpotentials and high current densities for hydrogen evolution reaction.
Defects engineering is an effective strategy to promote electrocatalytic performance. Herein, cobalt binary chalcogenide hollow spheres (CBC HSs) with sulfur (S) defects were prepared by selenium (Se) heteroatom substitution to enhance electrocatalytic water reduction. The Se atoms were intentionally introduced into the crystalline lattices of hexagonal CoS HSs, forming an anion solid solution with S vacancies. Due to enhanced intrinsic electroactivity and enlarged surface area, this CBC HS electrocatalyst exhibited low overpotentials of 108 and 372 mV to realize current densities of 10 and 100 mA cm(-2), respectively, for hydrogen evolution reaction.
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