Constructing low-cost Ni3C/twin-crystal Zn0.5Cd0.5S heterojunction/homojunction nanohybrids for efficient photocatalytic H2 evolution

被引:315
|
作者
Shen, Rongchen [1 ]
Ding, Yingna [2 ]
Li, Shibang [2 ]
Zhang, Peng [3 ]
Xiang, Quanjun [4 ]
Ng, Yun Hau [5 ]
Li, Xin [1 ,2 ]
机构
[1] South China Agr Univ, Coll Forestry & Landscape Architecture, Key Lab Energy Plants Resource & Utilizat, Minist Agr, Guangzhou 510642, Guangdong, Peoples R China
[2] South China Agr Univ, Coll Mat & Energy, Guangzhou 510642, Guangdong, Peoples R China
[3] Zhengzhou Univ, State Ctr Int Cooperat Designer Low Carbon & Envi, Sch Mat Sci & Engn, Zhengzhou 450001, Henan, Peoples R China
[4] Univ Elect Sci & Technol China, State Key Lab Elect Thin Film & Integrated Device, Chengdu 610054, Sichuan, Peoples R China
[5] City Univ Hong Kong, Sch Energy & Environm, Hong Kong, Peoples R China
基金
中国国家自然科学基金;
关键词
Photocatalytic H-2 evolution; Zn0.5Cd0.5S solid solution; Twin nanocrystal; Heterojunction/homojunction; Earth-abundant Ni3C cocatalysts; METAL-FREE PHOTOCATALYST; FREE NIS COCATALYST; IN-SITU SYNTHESIS; HYDROGEN EVOLUTION; G-C3N4; NANOSHEETS; SOLID-SOLUTION; H-2-EVOLUTION PERFORMANCE; CDS NANOSHEETS; GENERATION; WATER;
D O I
10.1016/S1872-2067(20)63600-2
中图分类号
O69 [应用化学];
学科分类号
081704 ;
摘要
The development of low-cost semiconductor photocatalysts for highly efficient and durable photocatalytic H-2 evolution under visible light is very challenging. In this study, we combine low-cost metallic Ni3C cocatalysts with twin nanocrystal Zn0.5Cd0.5S (ZCS) solid solution homojunctions for an efficient visible-light-driven H-2 production by a simple approach. As-synthesized Zn0.5Cd0.5S-1% Ni3C (ZCS-1) heterojunction/homojunction nanohybrid exhibited the highest photocatalytic H-2-evolution rate of 783 mu mol h(-1) under visible light, which is 2.88 times higher than that of pristine twin nanocrystal ZCS solid solution. The apparent quantum efficiencies of ZCS and ZCS-1 are measured to be 6.13% and 19.25% at 420 nm, respectively. Specifically, the homojunctions between the zinc blende and wurtzite segments in twin nanocrystal ZCS solid solution can significantly improve the light absorption and separation of photogenerated electron-hole pairs. Furthermore, the heterojunction between ZCS and metallic Ni3C NP cocatalysts can efficiently trap excited electrons from ZCS solid solution and enhance the H-2-evolution kinetics at the surface for improving catalytic activity. This study demonstrates a unique one-step strategy for constructing heterojunction/homojunction hybrid nanostructures for a more efficient photocatalytic H-2 evolution compared to other noble metal photocatalytic systems. (C) 2021, Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by Elsevier B.V. All rights reserved.
引用
收藏
页码:25 / 36
页数:12
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