Rationally Designed n-n Heterojunction with Highly Efficient Solar Hydrogen Evolution

被引：93
|
作者：
Xu, Miao [1 ]
Ye, Tiannan [1 ]
Dai, Fang [2 ]
Yang, Jindi [1 ]
Shen, Jingmei [2 ]
He, Qingquan [1 ]
Chen, Wenlong [1 ]
Liang, Na [1 ]
Zai, Jiantao [1 ]
Qian, Xuefeng [1 ]
机构：
[1] Shanghai Jiao Tong Univ, Sch Chem & Chem Engn, Shanghai Electrochem Energy Devices Res Ctr, State Key Lab Met Matrix Composites, Shanghai 200240, Peoples R China
[2] Gen Motors, Global Res & Dev, Warren, MI 48090 USA
来源：
CHEMSUSCHEM | 2015年 / 8卷 / 07期
基金：
中国国家自然科学基金;
关键词：
active sites; hydrogen; n-n heterojunction; photocatalysis; water splitting; VISIBLE-LIGHT; H-2; EVOLUTION; CDS NANOPARTICLE; ZNWO4; OXIDE; WATER; ZNO; PHOTOCATALYSTS; SPECTROSCOPY; DEGRADATION;
D O I：
10.1002/cssc.201403334
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
In most of the reported n-n heterojunction photocatalysts, both the conduction and valence bands of one semiconductor are more negative than those of the other semiconductor. In this work, we designed and synthesized a novel n-n heterojunction photocatalyst, namely CdS-ZnWO4 heterojunctions, in which ZnWO4 has more negative conduction band and more positive valence band than those of CdS. The hydrogen evolution rate of CdS-30mol%-ZnWO4 reaches 31.46mmolh(-1)g(-1) under visible light, which is approximately 8 and 755 times higher than that of pure CdS and ZnWO4 under similar conditions, respectively. The location of the surface active sites is researched and a plausible mechanism of performance enhancement by the tuning of the structure is proposed based on the photoelectrochemical characterization. The results illustrate that this kind of nonconventional n-n heterojunctions is also suitable and highly efficient for solar hydrogen evolution.
引用
收藏
页码：1218 / 1225
页数：8
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