<br>Ti3C2 MXene 负载的 VS2 纳米花作为析氢反应的电催化剂,ACS Applied Nano Materials

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Ti3C2 MXene 负载的 VS2 纳米花作为析氢反应的电催化剂
ACS Applied Nano Materials ( IF 5.3 ) Pub Date : 2024-11-07 , DOI: 10.1021/acsanm.4c05027
Keqing Zhao ₁ , Yuxuan Zhang ₁ , Xinlong Zhang ₁ , Fei Xing ₁ , Yonghui Zhang ₁ , Yu Feng ₁ , Tong Zhou ₁

Affiliation

在能源短缺和环境退化两大困境的威胁下，开发可持续、清洁和高效的能源变得越来越紧迫。近年来，电催化析氢反应（HER）已成为一种很有前途的制备可持续氢气生产能源的方法。然而，金属过渡金属二硫化物（MTMD）的活性位点/活性相的整体性质限制了 HER 的性能与商业 Pt/C 催化剂的性能。在此，我们首次报道了 VS₂/Ti₃C₂ 异质结构在 MXene 衬底上的水热生长。VS₂/Ti₃C₂ 非均相结构表现出极高的催化活性和电化学耐久性。在 0.5 M H₂SO₄ 酸性电解质中，催化剂的过电位仅为 33 mV，塔菲尔斜率为 25.93 mV dec^–1，在 24 小时内表现出优异的耐久性和接近 100% 的法拉第效率。同时，X 射线光电子能谱（XPS）和透射电子显微镜（TEM）数据也证明了异质结构的形成。理论研究证实，在 VS₂/Ti₃C₂ 非均相结构中成功构建 Ti-S 键加速了电荷转移速率，从而改变了 VS₂ 纳米花的电学性质以及 Ti 边缘和 S 边缘的氢吸附性能。这项工作通过在 VS₂ 和 Ti₃C₂ 之间形成非均相结构来加速电催化剂的电荷转移速率，为高效电催化析氢反应提供了一种策略。

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VS2 Nanoflowers Supported on Ti3C2 MXene as Electrocatalyst for the Hydrogen Evolution Reaction

Under the threat of the two major dilemmas of energy scarcity and environmental degradation, the development of sustainable, clean, and efficient energy sources has become increasingly urgent. In recent years, electrocatalytic hydrogen evolution reaction (HER) has become a promising method for the preparation of energy sources for sustainable hydrogen production. However, the monolithic nature of the active site/active phase of metallic transition metal disulfides (MTMDs) limits the performance of HER to that of commercial Pt/C catalysts. Herein, we report the hydrothermal growth of VS₂/Ti₃C₂ heterogeneous structure on MXene substrates for the first time. The VS₂/Ti₃C₂ heterogeneous structure exhibits extremely high catalytic activity and electrochemical durability. Exhibiting an overpotential of only 33 mV and a Tafel slope of 25.93 mV dec^–1 in 0.5 M H₂SO₄ acidic electrolyte, the catalysts showed excellent durability over 24 h and near 100% Faraday efficiency. Meanwhile, the formation of heterogeneous structure was also demonstrated by both X-ray photoelectron spectroscopy (XPS) and transmission electron microscopy (TEM) data. Theoretical studies confirmed that the successful construction of Ti–S bonds in VS₂/Ti₃C₂ heterogeneous structure accelerates the charge transfer rate, which modifies the electrical properties of VS₂ nanoflowers and the hydrogen adsorption properties at the Ti-edge and the S-edge. This work accelerated the charge transfer rate of the electrocatalyst through the formation of a heterogeneous structure between VS₂ and Ti₃C₂, providing a strategy for highly efficient electrocatalytic hydrogen evolution reaction.

更新日期：2024-11-07

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