氢能源被视为21世纪最具发展潜力的清洁能源。光催化分解水制氢是一种重要的且有工业应用前景的制氢途径，也是光催化的重要研究方向。发展高光量子效率、高稳定性及廉价光催化剂和构建高效反应系统是研究核心。近年来，由非金属元素构成的新型光催化剂（如g-C3N4）由于具有价格低廉、环境友好、元素丰度高等特点而倍受关注。在前期工作中，我们成功地通过高温法制备出硼碳氮三元共聚物BCN半导体，初步开展了理论计算和光催化实验研究工作，发现BCN的能带结构与材料的碳、氮、硼的比例密切相关，在可见光照射下和电子助剂存在下，该三元固溶体具有很好稳定性和光催化制氢活性。但是我们也同时发现BCN半导体在光催化应用中还存在一些关键问题需要深入研究。为此，本课题拟进一步研究材料的构-效关系及其调控规律、光催化作用本质及反应机理，提高其光催化制氢性能，拓展BCN半导体光催化在能源、环境和化工等众多领域的工业化应用。

Hydrogen has been considered as one of the most potential clean energy sources in 21st century. Photocatalytic water splitting is one of the most important and promising routes to produce hydrogen, and thus becomes a fascinating research direction in photocatalysis. Low-cost and highly stable photocatalysts with high quantum yield and high-performance reaction systems are desirable for the practical applications. Recently, metal-free photocatalysts (e.g. g-C3N4) have attracted great attention because of their being low-cost, eco-friendly and earth-abundant. In our previous study, we successfully synthesized boron carbon nitride ternary (BCN) via high-temperature decomposition. We demonstrated the band structure of BCN strongly depends on the ratio of the elements boron, carbon and nitrogen contained in BCN. Moreover, we found for the first time BCN ternary exhibits an excellent catalytic activity for producing hydrogen in the presence of an electron promotor under visible light. However, there are still some key issues needed to be addressed for its practical application. Therefore, in this project, we plan to systematically investigate the structure - activity relationship and photocatalytic mechanism of BCN to enhance its photocatalytic hydrogen production and extend its other industrial applications.