关于解决g-C3N4在光催化制氢领域的两个局限的研究进展

Research progress on solving two limitations of g-C3N4 in photocatalytic hydrogen production

摘要:

随着工业的发展，化石燃料消耗巨大，环境问题也日益突出，寻找一种绿色新型能源已成为一个被广泛讨论的问题。氢气是一种清洁、可再生燃料，利用光催化剂分解水制氢气是一种制取氢气的有效途径。石墨碳氮化物（g-C3N4）作为光催化剂不仅成本低、反应稳定，而且其尺寸、厚度、结构、形貌等可控，在众多光催化剂中脱颖而出。但g-C3N4目前在光催化领域主要存在两个局限：g-C3N4不能有效地吸收光来产生足够多的光生电子-空穴对；g-C3N4不能有效的运输及分离光生电子-空穴对，以至于电子与空穴的复合率较高。文章综述了g-C3N4在光催化制氢领域的进展成果，分析了g-C3N4存在的问题并总结了其改进方法，最后对g-C3N4进行了展望，以期为设计高效、稳定的光催化制氢材料提供参考。

Abstract:

It is more and more important to find a novel green energy with the development of industry and consumption of fossil fuel. Hydrogen is a kind of clean and renewable fuel, and using photocatalyst to decompose water to produce hydrogen is an effective way to produce hydrogen. Graphite carbonitride photocatalyst (g-C3N4) as photocatalyst is low-cost and stable, also its size, thickness, structure and morphology is controllable. However, there are two main limitations of g-C3N4 in the field of photocatalysis: 1), the absorb light of g-C3N4 is limited by the wide band gap which caused the photoelectron-hole pairs is insufficient; 2), the recombination of electron and hole is high due to the transportation and separation of photoelectron-hole pair in g-C3N4 is limited. In this paper, the research progress of g-C3N4 in the field of photocatalytic hydrogen production is reviewed, the problem of g-C3N4 as photocatalyst is analyzed, also the improvement methods are summarized. Finally, the future development of g-C3N4 is prospected, the results can be used as a reference for the design and preparation of efficient and stable photocatalytic materials.