期刊
ELECTROCHIMICA ACTA
卷 328, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2019.135075
关键词
Hydrogen evolution reaction; Interface engineering; NiTe2; NiS; Te nanowires
资金
- Foundation for Innovation Team of Bioanalytical Chemistry
- Anhui Provincial Department of Education Natural Science Foundation [KJ2017A315]
Transition metal chalcogenides are promising hydrogen evolution reaction (HER) electrocatalysts; however, their performance still needs to be improved to meet the requirements of practical applications. Herein, an interface-engineering strategy is exploited to prepare efficient transition metal chalcogenide based HER catalysts in alkaline medium. Specifically, the heterogeneous nanostructure of 1D core-shell Te@NiTe2 and 2D NiS (Te@NiTe2/NiS) has been fabricated by an easy one-step solvothermal method. The HER activity of Te@NiTe2/NiS is optimized by adjusting the ratio of raw materials and reaction time. Under the optimum conditions, the Te@NiTe2/NiS displays higher HER activity than individual Te@NiTe2 and NiS in alkaline medium and the reasons are investigated in detail. To improve the HER activity of Te@NiTe2/NiS, the Te@NiTe2/NiS is further combined with conductive acetylene black (AB) by physically mixing. The resulting Te@NiTe2/NiS/AB has a low overpotential at 10 mA/cm(2) of 101 mV, higher current density than 20% Pt/C when the overpotential is larger than 0.37 V and good long-term stability, indicating its practicability as HER electrocatalysts. This work presents the validity of interface-engineering strategy in preparing highly efficient transition metal chalcogenides based HER electrocatalysts. (C) 2019 Elsevier Ltd. All rights reserved.
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