Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 10, Issue 3, Pages 2430-2441Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.7b14506
Keywords
Ni-S-Se nanorods; hydrogen evolution reaction; water splitting; electrocatalysis; DFT calculation
Funding
- Program for the Outstanding Innovative Teams of Higher Learning Institutions of Shanxi OIT
- Program for Shanxi Key Laboratory of Gas Energy Efficient and Clean Utilization [201705D111002]
- Shanxi Scholarship Council of China [2017-034]
- Special/Youth Foundation of Taiyuan University of Technology [1205-04020203]
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In this study, a novel three-dimensional self supported ternary NiS-Ni9S8-NiSe nanorod (NR) array cathode has been successfully in situ constructed by a two-step hydrothermal route. When applied to hydrogen evolution, the synthesized NiS-Ni9S8-NiSe-NR electrode demonstrates optimized electrocatalytic activity and long-term durability, only requiring overpotentials as low as 120 and 112 mV to drive 10 mA cm(-2) for hydrogen evolution reaction in 0.5 M H2SO4 and 1.0 M KOH, respectively. Density functional theory calculation reveals that after Se doping Se 3d orbitals are bonded to Ni 3d orbitals and S p orbitals near Fermi level, attesting a significant electron transfer between nickel and selenium atoms. The success of enhancing the electrocatalytic performance via introducing the Se dopant holds great promise for the potential optimization of other transition-metal compounds in highly efficient electrochemical water splitting for large-scale hydrogen production.
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