Ni/NiO异质结的离子注入制备及其电催化析氢性能研究

高效催化电极是制备清洁能源氢气的关键，在碱性析氢反应中，因Ni催化剂的氢吸附自由能强及水解效率低，其过电势相对较高。研究表明，调控电子结构可优化氢吸附自由能，进而提高本征催化活性；与化合物形成异质结可以提高水解效率。然而，较少有研究发挥金属与化合物的原子相互作用，同时实现电子结构调控及提高水解效率。近期和申请人研究表明，当纳米颗粒镶嵌入介质中时，与介质的相互作用将使其电子结构发生改变。因此，本项目提出利用离子注入制备Ni纳米颗粒半裸露式镶嵌NiO的异质结构，可使Ni与NiO相互作用，调节Ni的电子结构；同时暴露Ni与NiO表面，提高水解效率；此外，还可提高稳定性，发挥协同作用，有望进一步提高Ni基催化剂的碱性析氢活性。同时，利用多种物质结构、电化学及理论计算分析手段，揭示该异质结电子结构与暴露比例等微结构对其析氢性能的作用及机制，为开发高效催化电极提供离子束改性实验方法及理论指导。

The high efficiency catalytic electrode is the key to the preparation of clean hydrogen energy. The Ni catalyst has a relatively high overpotential of hydrogen evolution reaction in alkaline electrolyte because of its strong free energy of hydrogen adsorption and low hydrolysis efficiency. The research showed that adjusting the electronic structure could optimize the free energy of hydrogen adsorption and improving the intrinsic catalytic activity. The formation of heterojunction with the compound can use the compound to improve the hydrolysis efficiency. However, there are relative few studies focus on the atomic interaction between metal nanoparticles and compounds to adjust the electronic structure and improve the hydrolysis efficiency at the same time. Recent research and applicant have shown that the electronic structure of nanoparticles will be changed by interacting with the medium with embedded in medium. Therefore, this project intends to use ion implantation technology to prepare the heterostructures of Ni nanoparticles embedded in NiO in semi-exposed form, which can not only adjust the electronic structure of Ni by interacting with the NiO, but also improve the hydrolysis efficiency by exposing the surface of NiO at the same time. In addition, the stability can also be improved. The synergistic effect is expected to further improve the hydrogen evolution activity of Ni catalyst in alkaline electrolyte. At the same time, the effect and mechanism of the electronic structure and exposure ratio of the heterojunction on the performance of hydrogen evolution reaction in alkaline electrolyte will reveal by means of various material structure, electrochemical and theoretical calculation analysis. This project will provide experimental and theoretical guidance for the development of efficient catalytic electrode by ion beam technology.