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Science China Materials

, Volume 62, Issue 5, pp 653–661 | Cite as

Improved photoelectric properties of BiOBr nanoplates by co-modifying SnO2 and Ag to promote photoelectrons trapped by adsorbed O2

  • Hao Wang (王皓)
  • Yang Qu (曲阳)Email author
  • Zhikun Xu (徐志堃)
  • Xuliang Zhang (张旭良)
  • Xinxin Zhang (张鑫鑫)
  • Fan Yang (杨帆)
  • Liqiang Jing (井立强)Email author
Articles
  • 85 Downloads

Abstract

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.

Keywords

Ag-SnO2-BiOBr photoelectron trapping O2 adsorption charge separation surface photovoltage response 

通过SnO2和Ag共修饰促进光生电子捕获氧气改善BiOBr纳米盘的光电特性

摘要

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-SnO2-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-SnO2-BiOBr复合纳米材料的电荷转移和分离机制. 结果表明, SnO2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SnO2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SnO2/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.

Notes

Acknowledgements

The authors are grateful for 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) and UNPYSCT-2016173.

Supplementary material

40843_2018_9362_MOESM1_ESM.pdf (1.5 mb)
Synergistic effect of SnO2 platform and Ag activator for improving the photoelectric property of BiOBr nanoplates via modulating photoelectrons and activating O2

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Copyright information

© Science China Press and Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  • Hao Wang (王皓)
    • 1
  • Yang Qu (曲阳)
    • 1
    Email author
  • Zhikun Xu (徐志堃)
    • 2
  • Xuliang Zhang (张旭良)
    • 1
  • Xinxin Zhang (张鑫鑫)
    • 1
  • Fan Yang (杨帆)
    • 1
  • Liqiang Jing (井立强)
    • 1
    Email author
  1. 1.Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education, School of Chemistry and Materials ScienceHeilongjiang UniversityHarbinChina
  2. 2.Key Laboratory for Photonic and Electronic Bandgap Materials, Ministry of Education, School of Physics and Electronic EngineeringHarbin Normal UniversityHarbinChina

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