journal article·2017-05-12

Activating and Optimizing Activity of CoS2 for Hydrogen Evolution Reaction through the Synergic Effect of N Dopants and S Vacancies

Jingyan Zhang, Wen Xiao, Pinxian Xi, Shibo Xi, Yonghua Du, Daqiang Gao, Jun Ding

ACS Energy Letters· Volume 2· Issue 5
Publisher page

Abstract

Here, N-doped cobalt pyrite (CoS 2 ) electrocatalytic material is developed via utilizing the synergic effect of N dopants and S vacancies. The catalyst displays high activity and stability for hydrogen evolution reaction. Density functional theory calculations and electrochemical characterizations reveal that the electrochemical activity of the CoS 2 catalyst is directly associated with the content of N dopants and S vacancies, where proper combinations of N dopants and S vacancies yield a minimized overpotential close to that of commercial Pt. What’s more, optimized performance has been achieved by carefully manipulating the amounts of N dopants and S vacancies in N-doped CoS 2 catalyst, which exhibits a Tafel slope as small as 48 mV/dec, an ultralow overpotential of 57 mV at 10 mA/cm 2, and satisfying stability. This work highlights a feasible strategy to explore efficient electrocatalysts via nonmetal element doping and defect engineering.
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Research context

OpenAlex topics: Electrocatalysts for Energy Conversion · Advanced battery technologies research · Electrochemical Analysis and Applications

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Key Laboratory for Magnetism and Magnetic Materials of MOE, Key Laboratory of Special Function Materials and Structure Design of MOE, Lanzhou University, Lanzhou 730000, People’s Republic of China

Department of Materials Science and Engineering, National University of Singapore, 9 Engineering Drive 1, Singapore 117575

Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province and The Research Center of Biomedical Nanotechnology, Lanzhou University, Lanzhou, 730000, People’s Republic of China

Institute of Chemical and Engineering Sciences, A*STAR, 1 Pesek Road, Jurong Island 627833, Singapore

Funding

Ministry of Education of the People's Republic of China · National Research Foundation Singapore · China Scholarship Council · National Natural Science Foundation of China · Strategic Fund, National University of Singapore

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