材料科学
合金
催化作用
吉布斯自由能
分解水
氢
过渡金属
电催化剂
金属
纳米技术
化学工程
物理化学
冶金
电化学
电极
热力学
化学
光催化
有机化学
工程类
物理
作者
Ik Seon Kwon,Ju Yeon Kim,Getasew Mulualem Zewdie,Junjie Yang,Kug‐Seung Lee,Seung Jo Yoo,Ik Seon Kwon,Jeunghee Park,Hong Seok Kang
标识
DOI:10.1002/adma.202310769
摘要
It is challenging to control the electronic structure of 2D transition metal dichalcogenides (TMD) for extended applications in renewable energy devices. Here, ReSe2-VSe2 (Re1-xVxSe2) alloy nanosheets over the whole composition range via a colloidal reaction is synthesized. Increasing x makes the nanosheets more metallic and induces a 1T″-to-1T phase transition at x = 0.5-0.6. Compared to the MoSe2-VSe2 and WSe2-VSe2 alloy nanosheets, ReSe2 and VSe2 are mixed more homogeneously at the atomic scale. The alloy nanosheets at x = 0.1-0.7 exhibit an enhanced electrocatalytic activity toward acidic hydrogen evolution reaction (HER). In situ X-ray absorption fine structure measurements reveal that alloying caused the Re and V atoms to be synergically more active in the HER. Gibbs free energy (ΔGH*) and density of state calculations confirm that alloying and Se vacancies effectively activate the metal sites toward HER. The composition dependence of HER performance is explained by homogenous atomic mixing with the increased Se vacancies. The study provides a strategy for designing new TMD alloy nanosheets with enhanced catalytic activity.
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