期刊
ACS APPLIED MATERIALS & INTERFACES
卷 9, 期 8, 页码 7154-7159出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b15719
关键词
NiSe2 nanocrystals; solvothermal reaction; hydrogen evolution reaction; ultrasmall Tafel slope; transition metal dichalcogenide; nickel dichalcogenide; electrocatalytic activity
资金
- National Natural Science Foundation of China [51372033, 51202022, 61378028]
- National High Technology Research and Development Program of China [2015AA034202]
- 111 Project [B13042]
For the first time, self-assembled coral-like hierarchical architecture constructed by NiSe2 nanocrystals has been synthesized via a facile one-pot DMF-solvothermal method. Compared with hydrothermally synthesized NiSe2 (H-NiSe2), the DMF-solvothermally synthesized nanocrystalline NiSe2 (DNC-NiSe2) exhibits superior performance of hydrogen evolution reaction (HER): it has a very low onset overpotential of similar to 136 mV (vs RHE), a very high cathode current density of 40 mA/cm(2) at similar to 200 mV (vs RHE), and an excellent long-term stability; most importantly, it delivers an ultrasmall Tafel slope of 29.4 mV dec(-1), which is the lowest ever reported for NiSe2-based catalysts, and even lower than that of precious platinum (Pt) catalyst (30.8 mV dec(-1)). The superior HER performance of DNC-NiSe2 is attributed to the unique self-assembled coral-like network, which is a benefit to form abundant active sites and facilitates the charge transportation due to the inherent high conductivity of NiSe2 nano crystals. The DNC-NiSe2 is promising to be a viable alternative to precious metal catalysts for hydrogen evolution.
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