The synergistic effect with S-vacancies and built-in electric field on a TiO2/MoS2 photoanode for enhanced photoelectrochemical performance

被引：67

作者：

Han, Jianhua ^{[1
]}

Zhang, Shaoce ^{[2
]}

Song, Qinggong ^{[1
]}

Yan, Huiyu ^{[1
]}

Kang, Jianhai ^{[1
]}

Guo, Yanrui ^{[1
]}

Liu, Zhifeng ^{[1
,2
]}

机构：

[1] Civil Aviat Univ China, Coll Sci, Tianjin 300300, Peoples R China

[2] Tianjin Chengjian Univ, Tianjin Key Lab Bldg Green Funct Mat, Sch Mat Sci & Engn, Tianjin 300384, Peoples R China

来源：

SUSTAINABLE ENERGY & FUELS | 2021年 / 5卷 / 02期

基金：

中国国家自然科学基金;

关键词：

MOS2 ULTRATHIN NANOSHEETS; ACTIVE EDGE SITES; P-N-JUNCTION; OXYGEN VACANCIES; HYDROGEN EVOLUTION; NANOROD ARRAYS; WATER; HETEROJUNCTION; DEFECT; OXIDE;

D O I：

10.1039/d0se01515f

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：

It is significant to design an electrode with high carrier separation and transport efficiency in a photoelectrochemical water splitting system. In this study, we utilized a facile H2O2 etching method for modulating S-vacancies in a TiO2/MoS2 nanostructure to enhance photoelectrochemical performance. The as-prepared TiO2/MoS2 with S-vacancies demonstrates an increased photocurrent density of 1.56 mA cm(-2) at 1.23 V vs. RHE, which is 2.14 times higher than that of pristine TiO2 (0.73 mA cm(-2) at 1.23 V vs. RHE). An appropriate energy level alignment between TiO2 and MoS2 and defect modulation are demonstrated in this study. The photo-generated electrons and holes are effectively separated and transported due to the built-in electric field in TiO2/MoS2. Moreover, the surface oxygen production reaction is enhanced due to its plenty exposed reaction active sites. This study demonstrates the synergistic effects of S-vacancies and built-in electric field in enhancing the carrier separation and transport properties. Furthermore, this study provides a universal strategy in designing high quality photoelectrodes in the photoelectrochemical system.

引用

页码：509 / 517

页数：9

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