期刊
MATERIALS TODAY CHEMISTRY
卷 29, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.mtchem.2023.101425
关键词
Core-shell structure; Heterostructure; Nanoarray; Hydrogen evolution reaction; Oxygen evolution reaction
A hollow nanoplate array of MoSe2/Co0.85Se heterostructure on a nickel frame was prepared using a metal-organic framework as a template and a process of dissolution-regrowth followed by gas-phase selenization and annealing. The 3D architecture of the MoSe2/Co0.85Se heterostructure exhibited significantly enhanced activity and durability as a bifunctional electrocatalyst for oxygen and hydrogen evolution reactions in alkaline solution. The superior performance of the MoSe2/Co0.85Se heterostructure holds great promise as an advanced catalyst for water splitting on an industrial scale.
Hollow nanoplate array of MoSe2/Co0.85Se heterostructure on nickel frame (MoSe2/Co0.85Se/NF) was prepared using metal-organic framework as a template via a process of dissolution-regrowth following by gas-phase selenization and annealing. 3D architecture of MoSe2/Co0.85Se heterostructure shows a significantly enhanced activity and durability as a bifunctional electrocatalyst for oxygen and hydrogen evolution reactions (OER and HER) in alkaline solution. A current density of 10 mA/cm2 can be delivered at an overpotential of 102 mV for HER and 229 mV for OER with a corresponding Tafel slope of only 35 mV/dec for HER and 48 mV/dec for OER, respectively. Density functional theory calculations revealed that MoSe2/Co0.85Se heterostructure will favor water dissociation, and the neutral adsorption energy of H* intermediate in MoSe2/Co0.85Se heterostructure can boost hydrogen evolution. OER measurements will cause surface reconstruction of MoSe2/Co0.85Se/NF and form a new heterostructure of CoO/ Co2Mo3O8 in alkaline media. OER occurs at Co atoms on CoO/Co2Mo3O8 heterojunction interface, and the neighboring Mo atom will promote the formation of OOH* intermediate, leading to a fast OER kinetics. The superior HER and OER performance of MoSe2/Co0.85Se/NF can rival most of reported transition metal catalysts, holding great promise as advanced catalysts for water splitting in industrial scale.(c) 2023 Elsevier Ltd. All rights reserved.
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