Enhanced Photocarrier Separation in Hierarchical Graphitic-C3N4-Supported CuInS2 for Noble-Metal-Free Z-Scheme Photocatalytic Water Splitting

被引:102
作者
Li, Xiaoxue [1 ,2 ]
Xie, Keyu [3 ]
Song, Long [1 ,2 ]
Zhao, Mengjia [1 ,2 ]
Zhang, Zhipan [1 ,2 ]
机构
[1] Beijing Inst Technol, Sch Chem & Chem Engn, Minist Educ China, Key Lab Cluster Sci, Beijing 100081, Peoples R China
[2] Beijing Inst Technol, Sch Chem & Chem Engn, Beijing Key Lab Photoelect Electrophoton Conver M, Beijing 100081, Peoples R China
[3] Northwestern Polytech Univ, State Key Lab Solid Proc, Xian 710072, Shaanxi, Peoples R China
关键词
Z-scheme; copper indium sulfide; graphitic carbon nitride; hydrogen generation; photocatalytic water splitting; CARBON NITRIDE NANOSHEETS; DRIVEN Z-SCHEME; VISIBLE-LIGHT; H-2; EVOLUTION; SOLAR-CELLS; HYDROGEN EVOLUTION; PERFORMANCE; GRAPHENE; EXFOLIATION; GENERATION;
D O I
10.1021/acsami.7b06030
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
The effective separation of photogenerated electrons and holes in photocatalysts is a prerequisite for efficient photocatalytic water splitting. CuInS2 (CIS) is a widely used light absorber that works properly in photovoltaics but only shows limited performance in solar-driven hydrogen evolution due to its intrinsically severe charge recombination. Here, we prepare hierarchical graphitic C3N4-supported CuInS2 (denoted as GsC) by an in situ growth of CIS directly on exfoliated thin graphitic C3N4 nanosheets (g-C3N4 NS) and demonstrate efficient separation of photoinduced charge carriers in the GsC by forming the Z-scheme system for the first time in CIS-catalyzed water splitting. Under visible light illumination, the GsC features an enhanced hydrogen evolution rate up to 1290 mu mol g(-1) h(-1), which is 3.3 and 6.1 times higher than that of g-C3N4 NS and bare-CIS, respectively, thus setting a new performance benchmark for CIS-based water-splitting photocatalysts.
引用
收藏
页码:24577 / 24583
页数:7
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