摘要
It is highly desired to improve the photoelectric property of nanosized BiOBr by promoting the photogenerated charge transfer and separation. Herein, SnO2 and Ag comodified BiOBr nanocomposites(Ag-SO-BOB) have been prepared through a simple one-pot hydrothermal method.Surface photovoltage response of BiOBr nanoplates has 4.1-time enhancement after being modified with SnO2 nanoparticles. Transient-state surface photovoltage(TS-SPV) and the atmosphere-controlled steady-state surface photovoltage spectroscopy(AC-SPS) confirmed that this exceptional enhancement of the photovoltage response can be ascribed to the coupled SnO2 acting as platform for accepting the photoelectrons from BiOBr so as to prolong the lifetime and enhance charge separation. Remarkably, the surface photovoltage response can be further enhanced by synchronously introducing Ag nanoparticles, which is up to 15.4-times enhancement compared with bulk BiOBr nanoplates. The enhancement can be attributed to the improved O2 adsorption by introducing Ag to further enhance charge separation. Finally, the synergistic effect of SnO2 and Ag co-modification enhances the surface photovoltage response due to the enhanced charge separation and promoted O2 adsorption, which is also confirmed through photoelectrochemistry and photocatalytic experiment.
针对BiOBr纳米材料导带位置偏正导致的可见光生电子寿命短、电荷分离差和氧气捕获能力差等关键科学问题,本文通过简单的一步水热法合成高光伏响应的Ag-SnO_2-BiOBr复合纳米材料.通过气氛控制表面光电压、瞬态光电压技术和光电化学实验等深入揭示了Ag-SnO_2-BiOBr复合纳米材料的电荷转移和分离机制.结果表明, SnO_2可作为适当能量水平的可见光生电子接收平台,有效延长光生电子的寿命,提高其利用率并促进光生电荷分离.共修饰Ag有效改善了SnO_2和BiOBr的表面氧吸附能力,进一步促进了BiOBr可见光生电子的有效分离,因此表现出高的光伏响应,分别是SnO_2/BiOBr、Ag/BiOBr和BiOBr的3.8、1.3和15.4倍.本工作对深入研究含铋半导体材料的光电特性和电荷分离机理具有重要的意义,为后续设计光伏传感等光电器件提供实验和理论依据.
作者
Hao Wang
Yang Qu
Zhikun Xu
Xuliang Zhang
Xinxin Zhang
Fan Yang
Liqiang Jing
王皓;曲阳;徐志堃;张旭良;张鑫鑫;杨帆;井立强(Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education, School of Chemistry and Materials Science, Heilongjiang University;Key Laboratory for Photonic and Electronic Bandgap Materials, Ministry of Education, School of Physics and Electronic Engineering, Harbin Normal University)
基金
financial support from the National Natural Science Foundation of China (U1401245, 21501052 and 91622119)
the Program for Innovative Research Team in Chinese Universities (IRT1237)
China Postdoctoral Science Foundation (2015M570304)
the Special Funding for Postdoctoral of Heilongjiang Province (LBH-TZ06019)
UNPYSCT-2016173
作者简介
Hao Wang, obtained her BSc degree from Bohai University in 2016. She then moved to the College of Physics in Heilongjiang University for her Master degree. She is interested in developing photoelectric properties of bismuthcontaining materials;Corresponding authors:曲阳(emails: quyang@hlju.edu.cn (Qu Y);Yang Qu obtained his BSc and MSc degree from Heilongjiang University in 2008, and his PhD degree from Jilin University in 2014. At present, he works in Heilongjiang University. His current research concentrates on the synthesis of Bi-contained multi-metal oxides and their applications in the fields of environment remediation and solar fuel production. Liqiang;Corresponding authors:井立强(emails:jinglq@hlju.edu.cn (Jing L))Liqiang Jing is a full professor in Heilongjiang University. He received a PhD degree in environmental chemistry from Harbin Institute of Technology in 2003, and completed a postdoctoral programme in physical chemistry at Jilin University from 2004 to 2006. From 2009 to 2010, Professor Jing worked in professor Durrant's group as an visiting scholar in the department of Chemistry at Imperial College London, UK. His research fields include semiconductor photocatalysis and photogenerated charge properties.通.
