In-situ fabrication of CuS/g-C3N4 nanocomposites with enhanced photocatalytic H2-production activity via photoinduced interfacial charge transfer

被引:131
作者
Chen, Tianjun [1 ]
Song, Chengjie [1 ]
Fan, Mingshan [1 ]
Hong, Yuanzhi [2 ]
Hu, Bo [1 ]
Yu, Longbao [1 ]
Shi, Weidong [1 ]
机构
[1] Jiangsu Univ, Sch Chem & Chem Engn, Zhenjiang 212013, Peoples R China
[2] Jiangsu Univ, Sch Mat Sci & Engn, Zhenjiang 212013, Peoples R China
关键词
Interfacial charge transfer; CuS; g-C3N4; Hydrogen production; CARBON NITRIDE SEMICONDUCTORS; VISIBLE-LIGHT IRRADIATION; HYDROGEN-PRODUCTION; EFFICIENT; EVOLUTION; HETEROSTRUCTURES; PERFORMANCE; G-C3N4; HETEROJUNCTION; GENERATION;
D O I
10.1016/j.ijhydene.2017.03.188
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
In this work, novel CuS/g-C3N4 composite photocatalysts were successfully prepared via a simple in-situ growth method. CuS nanoparticles, with an average diameter of ca.10 nm, were well dispersed on the surface of g-C3N4, revealing that g-C3N4 nanosheets were promising support for in-situ growth of nanosize materials. The CuS/g-C3N4 composites exhibited highly enhanced visible light photocatalytic H-2 evolution from water -splitting compared to pure g-C3N4. The optimum photocatalytic activity of 2 wt% CuS/g-C3N4 composite photocatalytic H-2 evolution was about 13.76 times higher than pure g-C3N4. The enhanced photocatalytic activity is attributed to the interfacial charge transfer (IFCT). In this system, electrons in the valence band (VB) of g-C3N4 can transfer directly to CuS clusters, causing the reduction of partial CuS to Cu2S, which can act as an electron sink and co-catalyst to promote the separation and transfer of photo-generated electrons. The accumulated photoinduced electrons in CuS/Cu2S clusters could effectively reduce H+ to produce H-2. This work provides a possibility for constructing low-cost CuS as a substitute for noble metals in the photocatalytic production of H-2 via a facile method based on g-C3N4. (C) 2017 Published by Elsevier Ltd on behalf of Hydrogen Energy Publications LLC.
引用
收藏
页码:12210 / 12219
页数:10
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