本项目结合能源材料领域对高效析氢电催化剂的迫切需求，针对电催化析氢反应中氢吸附过程和氢脱附过程不平衡、活性位点利用率低的问题，提出以新型可调控的二维硅氧烯作为铂族贵金属（Pt/Ir/Ru等）的有效载体，构筑氢溢流和氢反溢流贵金属/硅氧烯电催化剂，旨在提升高活性铂族贵金属的析氢电催化效率，减少贵金属负载量，从而降低应用成本。针对不同贵金属的氢吸附/脱附能力差异，拟通过调控二维硅氧烯的结构组成、表面性质和电子结构以及贵金属与硅氧烯的界面电子结构，设计构筑具有有效氢溢流或氢反溢流效应的贵金属/硅氧烯复合体系；在探究贵金属与硅氧烯的电子效应的基础上，揭示二者之间的氢溢流或氢反溢流效应对析氢电催化活性的影响并阐明析氢机理，开发低负载量的高效贵金属/硅氧烯析氢电催化剂。该研究可以为双组分析氢电催化剂的设计、研发提供新思路，是一项在理论和实际应用方面都具有突破潜力和重要意义的创新性研究。

Designing high-efficient electrocatalysts for hydrogen evolution reaction (HER) has attracted substantial attention owing to the urgent demand in the field of energy materials. From a fundamental viewpoint, the reaction rate of HER is a trade-off between hydrogen adsorption and desorption on the surface of catalysts. Too strong or too weak adsorption/desorption for hydrogen will result in either active site poisoning or inefficient proton supply. On the issues of the imbalance in hydrogen adsorption and desorption as well as the low utilization of active sites, this project proposes the construction of the noble-metal/siloxene electrocatalysts for HER based on the H-spillover and reverse H-spillover effect for the first time, using a novel regulable two-dimensional (2D) siloxene as an effective support for platinum group noble metals (Pt/Ir/Ru, etc.). Improved electrocatalytic efficiency of the HER electrocatalysts with decreased noble-metal loading and thus reduced cost will be realized. On the one hand, considering the difference in the hydrogen adsorption/desorption ability of different noble metals, the noble-metal/siloxene composite systems with efficient H-spillover or reverse H-spillover will be designed and constructed by regulating the morphology, composition, surface properties, and electronic structure of 2D siloxene as well as the interface electronic structure between noble metals and siloxene. On the other hand, the effect of H-spillover or reverse H-spillover on HER electrocatalytic activity and corresponding HER mechanism will be investigated based on exploring the electronic effect between noble metals and siloxene. Finally, high-efficiency noble-metal/siloxene electrocatalysts for HER with low loading of noble metals are expected. Relevant research work will provide new ideas for the design, research and development of binary HER electrocatalysts. It is an innovative research with breakthrough potential and important significance in theoretical and practical aspects.