Controllable synthesis and phase-dependent catalytic performance of dual-phase nickel selenides on Ni foam for overall water splitting
Tan, Lei 1Yu, Jiangtao 1Wang, Haiyan 1Gao, Hongtao 1Liu, Xien 1Wang, Lei 1She, Xilin 2Zhan, Tianrong1
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作者信息
1. Qingdao Univ Sci & Technol
2. Qingdao Univ
折叠
Abstract
NiSe2/Ni3Se4 dual-phase electrocatalysts are synthesized by calcining the Ni(OH)(2) nanosheets on Ni foam and Se powder under an N-2 atmosphere. The Ni's charge-state, phase compositions, and electrocatalytic performances are dependent on the initial mass ratios of Ni to Se. The experimental results demonstrate that the electrocatalyst with a higher Ni charge-state and more Ni3Se4 phase facilitates oxygen evolution reaction (OER), whereas the one with a lower Ni charge-state and more NiSe2 phase boosts hydrogen evolution reaction (HER). Density functional theory calculations reveal that the interfacial electrons transfer from Ni3Se4 to NiSe2, which improves conductivity and optimizes adsorption/desorption energies. NiSe2/Ni3Se4/NF-4 containing more NiSe2 phase displays the best HER activity while NiSe2/Ni3Se4/NF-1 containing more Ni3Se4 phase shows the best HER activity. The electrolyzer, employing NiSe2/Ni3Se4/NF-4 and NiSe2/Ni3Se4/NF-1 as the cathode and anode, respectively, performs the full potential and demonstrates a low voltage of 1.56 V achieving 10 mA cm(-2) with good durability.
NSTL
Elsevier