Efficient Visible-Light-Driven CO2 Reduction Mediated by Defect-Engineered BiOBr Atomic Layers

Angewandte Chemie
Ju WuYi Xie

Abstract

Solar CO2 reduction efficiency is largely limited by poor photoabsorption, sluggish electron-hole separation, and a high CO2 activation barrier. Defect engineering was employed to optimize these crucial processes. As a prototype, BiOBr atomic layers were fabricated and abundant oxygen vacancies were deliberately created on their surfaces. X-ray absorption near-edge structure and electron paramagnetic resonance spectra confirm the formation of oxygen vacancies. Theoretical calculations reveal the creation of new defect levels resulting from the oxygen vacancies, which extends the photoresponse into the visible-light region. The charge delocalization around the oxygen vacancies contributes to CO2 conversion into COOH* intermediate, which was confirmed by in situ Fourier-transform infrared spectroscopy. Surface photovoltage spectra and time-resolved fluorescence emission decay spectra indicate that the introduced oxygen vacancies promote the separation of carriers. As a result, the oxygen-deficient BiOBr atomic layers achieve visible-light-driven CO2 reduction with a CO formation rate of 87.4 μmol g-1  h-1 , which was not only 20 and 24 times higher than that of BiOBr atomic layers and bulk BiOBr, respectively, but also outperform...Continue Reading

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Citations

Sep 2, 2020·Chemical Communications : Chem Comm·Xiaodong SunTianyi Ma
May 28, 2020·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Jundan LiDongge Ma
Sep 16, 2020·Chemistry, an Asian Journal·Minhua AiJi-Jun Zou
Nov 3, 2020·Chemical Society Reviews·Xu-Bing LiLi-Zhu Wu
Jan 28, 2021·Advanced Materials·Fang ChenHongwei Huang
May 5, 2021·Journal of Colloid and Interface Science·Changjian ZhouWeidong Shi
Aug 12, 2021·Physical Chemistry Chemical Physics : PCCP·Sheng TianShuang-Feng Yin
Aug 14, 2021·ACS Applied Materials & Interfaces·Xingwang ZhuHui Xu
Aug 18, 2021·Chemistry, an Asian Journal·Yiming WuXiaogang Liu
Nov 26, 2020·Accounts of Chemical Research·Xiaodong LiYi Xie
Jun 30, 2019·ACS Applied Materials & Interfaces·Dong YaoHao Zhang
Jun 4, 2020·ACS Central Science·Xingchen JiaoYi Xie
Jun 20, 2020·ACS Applied Materials & Interfaces·Han ZhaoXiangmiao Zhu

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