Investigation on photocatalytic property of SiH/GaSe and SiH/InSe heterojunctions for photocatalytic water splitting

异质结 材料科学 光催化 单层 带隙 吸收(声学) 光电子学 光催化分解水 吸收边 光化学 分解水 化学 纳米技术 有机化学 复合材料 催化作用
作者
Zekun Yang,Huanming Chen,Fangfang Wu,Yi Hou,Jinyu Qiao,Xiaobo Ma,Hongcun Bai,Bin Ma,Jiapeng Li
出处
期刊:International Journal of Hydrogen Energy [Elsevier BV]
卷期号:47 (73): 31295-31308 被引量:27
标识
DOI:10.1016/j.ijhydene.2022.07.048
摘要

The structural stability, electronic structure and optical property of the monolayers SiH, GaSe and InSe as well as constructed SiH/GaSe and SiH/InSe heterojunctions are investigated based on first principles calculations. The band alignment and the charge transfer of SiH/GaSe and SiH/InSe heterojunctions as well as their solar-to-hydrogen production efficiency during photocatalytic process for water splitting are analyzed systematically. The effect of applied electric field or biaxial strain taking on the electronic structure of heterojunctions is also included. The results indicated that the absorption range and intensity of SiH/GaSe and SiH/InSe heterojunctions are significantly improved. Both SiH/GaSe and SiH/InSe heterojunctions have the relatively higher light absorption coefficient in the visible and ultraviolet range. These light absorption capacities are conducive to improve the solar-to-hydrogen production efficiency. Compared with the monolayers SiH, GaSe and InSe, the SiH/GaSe and SiH/InSe heterojunctions have the property of type-II band alignment. This band alignment is also in favor of improving the efficiency of photocatalytic activity. The band gap and band edge structure of SiH/GaSe and SiH/InSe heterojunctions can also be adjusted effectively by applied electric field or biaxial strain, which provides a method for improving the photocatalysis performance.
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