电催化剂
镍
材料科学
析氧
相(物质)
煅烧
阳极
电解
催化作用
解吸
阴极
分解水
吸附
化学工程
分析化学(期刊)
化学
电极
物理化学
冶金
电化学
光催化
有机化学
电解质
工程类
作者
Lei Tan,Jiangtao Yu,Haiyan Wang,Hongtao Gao,Xien Liu,Lei Wang,Xilin She,Tianrong Zhan
标识
DOI:10.1016/j.apcatb.2021.120915
摘要
NiSe2/Ni3Se4 dual-phase electrocatalysts are synthesized by calcining the Ni(OH)2 nanosheets on Ni foam and Se powder under an N2 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.
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