Synergism between chemisorption and unique electron transfer pathway in S-scheme AgI/g-C3N4 heterojunction for improving the photocatalytic H2 evolution

被引:27
作者
Shang, Yanyan [1 ]
Fan, Huiqing [1 ]
Yang, Xueya [1 ]
Dong, Wenqiang [2 ]
Wang, Weijia [1 ]
机构
[1] Northwestern Polytech Univ, Sch Mat Sci & Engn, State Key Lab Solidificat Proc, Xian 710072, Peoples R China
[2] Northwestern Polytech Univ, Inst Culture & Heritage, Xian 710072, Peoples R China
关键词
H2; production; S-scheme heterojunction; Built-in electric field; BORON-DOPED G-C3N4; REDUCTION; CO2; DEGRADATION; NANOSHEETS; PEROXYMONOSULFATE; COMPOSITE; IONS;
D O I
10.1016/j.jcis.2022.10.168
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
AgI/g-C3N4 S-scheme heterojunction with a unique electron transfer pathway was developed as a catalyst for H2 evolution. We discussed the behavior of chemisorption and photoexcited charge carriers in pho-tocatalytic reduction on the S-scheme AgI/g-C3N4 heterojunction. It was demonstrated that the path of charge transfer mediated by S-scheme AgI/g-C3N4 heterojunction was favorable for the improvement of electron utilization in photocatalysis. The advantage of S-scheme heterojunction was that the holes in the valence band (VB) of g-C3N4 could recombine with the electrons in the conduction band (CB) of AgI due to the built-in electric field. Electrons on the CB of g-C3N4 and holes on the VB of AgI were pre-served for further photocatalytic reaction. Therefore, a distinctive electron transfer pathway was intro-duced in the S-scheme heterojunction. In addition, the lifetime of charge carriers was prolonged, and the reduced ability of electrons was increased as compared to reference g-C3N4. It not only decreased the energy required for electron excitation, but also reduced the energy consumption for the charge transfer. This paper provided a new strategy to improve the utilization of photogenerated electrons and chemisorption of water for photocatalytic H2O splitting.(c) 2022 Elsevier Inc. All rights reserved.
引用
收藏
页码:269 / 280
页数:12
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