关键字：BIFUNCTIONAL ELECTROCATALYST; EFFICIENT ELECTROCATALYST; HYDROXIDE NANOSHEETS; OXYGEN REDUCTION; EVOLUTION; HYDROGEN; GRAPHENE; CARBON; DESIGN; OXIDES

摘要：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.

卷号：303

期号：

是否译文：否