Self-Assembled Coral-like Hierarchical Architecture Constructed by NiSe2Nanocrystals with Comparable Hydrogen-Evolution Performance of Precious Platinum Catalyst.
For the first time, self-assembled coral-like hierarchical architecture constructed by NiSe2nanocrystals 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 ∼136 mV (vs RHE), a very high cathode current density of 40 mA/cm2at ∼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-NiSe2is 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 NiSe2nanocrystals. The DNC-NiSe2is promising to be a viable alternative to precious metal catalysts for hydrogen evolution.
State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China , Chengdu 610054, People's Republic of China.
Bo
B
Yu
State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China , Chengdu 610054, People's Republic of China.
Xinqiang
X
Wang
State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China , Chengdu 610054, People's Republic of China.
Fei
F
Qi
State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China , Chengdu 610054, People's Republic of China.
Binjie
B
Zheng
State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China , Chengdu 610054, People's Republic of China.
Jiarui
J
He
State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China , Chengdu 610054, People's Republic of China.
Jie
J
Lin
State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China , Chengdu 610054, People's Republic of China.
Wanli
W
Zhang
State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China , Chengdu 610054, People's Republic of China.
Yanrong
Y
Li
State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China , Chengdu 610054, People's Republic of China.
Yuanfu
Y
Chen
NiSe2 nanocrystals; electrocatalytic activity; hydrogen evolution reaction; nickel dichalcogenide; solvothermal reaction; transition metal dichalcogenide; ultrasmall Tafel slope