A small organic molecule strategy for remedying oxygen vacancies by bismuth defects in BiOBr nanosheet with excellent photocatalytic CO_(2)reduction  

作　　者：Jing Xie Zhenjiang Lu Yue Feng Jianguo Huang Jindou Hu Aize Hao Yali Cao 

机构地区：[1]State Key Laboratory of Chemistry and Utilization of Carbon Based Energy Resources,College of Chemistry,Xinjiang University,Urumqi 830046,China

出　　处：《Nano Research》2024年第1期297-306,共10页纳米研究（英文版）

基　　金：supported by the National Natural Science Foundation of China(No.52162023);the Natural Science Foundation of Xinjiang Autonomous Region(No.2021D01C093);the Xinjiang Tianchi Doctoral Project(No.TCBS201933);the Xinjiang University Doctoral Research Foundation(No.BS190228).

摘　　要：Defect modulation currently plays a decisive role in addressing the poor photoabsorption,sluggish electron hole separation,and high CO_(2)activation barrier in photocatalytic CO_(2)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 CO_(2)molecules,the evolution rates of photocatalytic CO_(2)conversion into CO(71.23μmol·g^(-1)·h^(-1))and CH4(8.90μmol·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 CO_(2)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.

关 键 词：solid-state synthesis BiOBr metal vacancies PHOTOCATALYSIS carbon dioxide reduction 

分 类 号：O64[理学—物理化学]