A small organic molecule strategy for remedying oxygen vacancies by bismuth defects in BiOBr nanosheet with excellent photocatalytic CO2 reduction

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外文摘要：Defect modulation currently plays a decisive role in addressing the poor photoabsorption,sluggish electron hole separation,and high CO2 activation barrier in photocatalytic CO2 reduction.However,hunting for a straightforward strategy to balance the concentration of oxygen vacancy and metal cation defect in one photocatalyst is still a great challenge.Herein,a bismuth vacancies BiOBr nanosheets(BiOBr-1)on the exposed[001]facets were constructed via an acetic acid molecule modification strategy,which can repair oxygen defect by bismuth vacancy in low-temperature solid-state chemical method.Benefiting from the formed bismuth defects that can not only broaden light absorption and elevate charge separation efficiency,but also enhance adsorption and activation of CO2 molecules,the evolution rates of photocatalytic CO2 conversion into CO(71.23 μmol·g-1·h-1)and CH4(8.90 μmol·g-1·h-1)attained by BiOBr-1 are superior 7.1 and 11 times to that of plate-like BiOBr.The photocatalytic mechanisms including adsorption concentration and activation process of CO2 are further revealed by the in situ diffuse reflectance infrared flourier transform spectra(DRIFTS).This finding of the existence of distinct defects in ultrathin nanosheets undoubtedly leads to new possibilities for photocatalyst design using two-dimensional materials with high solar-driven photocatalytic activity.

外文关键词：

solid-state synthesisBiOBrmetal vacanciesphotocatalysiscarbon dioxide reduction

作者：

Jing Xie、Zhenjiang Lu、Yue Feng、Jianguo Huang、Jindou Hu、Aize Hao、Yali Cao

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作者单位：

State Key Laboratory of Chemistry and Utilization of Carbon Based Energy Resources

College of Chemistry,Xinjiang University,Urumqi 830046,China

基金：

National Natural Science Foundation of ChinaNatural Science Foundation of Xinjiang Autonomous RegionXinjiang Tianchi Doctoral ProjectXinjiang University Doctoral Research Foundation

项目编号：

521620232021D01C093TCBS201933BS190228

出版年：

2024

DOI：

10.1007/s12274-023-5828-2

纳米研究(英文版)

CSTPCD

ISSN：

年,卷(期)：2024.17(1)

参考文献量37