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

被引：94

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

页码：1218 / 1225

页数：8

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