Small moleculeπ-conjugated electron acceptor for highly enhanced photocatalytic nitrogen reduction of BiOBr  

作　　者：Derek Hao Tianyi Ma Baohua Jia Yunxia Wei Xiaojuan Bai Wei Wei Bing-Jie Ni 

机构地区：[1]Centre for Technology in Water and Wastewater(CTWW),School of Civil and Environmental Engineering,University of Technology Sydney(UTS),Sydney,NSW 2007,Australia [2]Centre for Translational Atomaterials,Faculty of Science,Engineering and Technology,Swinburne University of Technology,Hawthorn,VIC 3122,Australia [3]College of Chemistry and Chemical Engineering,Lanzhou City University,Lanzhou 730070,China [4]Beijing Engineering Research Center of Sustainable Urban Sewage System Construction and Risk Control,Beijing University of Civil Engineering and Architecture,Beijing 102612,China

出　　处：《Journal of Materials Science & Technology》2022年第14期276-281,共6页材料科学技术（英文版）

基　　金：supported by an Australian Research Council(ARC)Future Fellowship(FT160100195);the support from National Natural Science Foundation of China(21607034);Beijing Natural Science Foundation(8192011);Science and Technology General Project of Beijing Municipal Education Commission(KM202010016006);the Pyramid Talent Training Project of Beijing University of Civil Engineering and Architecture(JDYC20200313);the support of Key Talent Project of Gansu Province。

摘　　要：Artificial ammonia synthesis using solar energy is of great significance as it can help narrow the gap to the zero-net emission target.However,the current photocatalytic activity is generally too low for mass production.Herein,we report a novel bismuth bromide oxide(BiOBr)-Tetracyanoquinodimethane(TCNQ)photocatalyst prepared via a facile self-assembly method.Due to the well-match band structure of TCNQ and Bi OBr,the separation and transfer of photogenerated electron-hole pairs were significantly boosted.More importantly,the abundant delocalizedπelectrons of TCNQ,and the electron-withdrawing property of TNCQ made electrons efficiently accumulated on the catalysts,which can strengthen the adsorption and cleavage of nitrogen molecules.As a result,the photocatalytic activity increased significantly.The highest ammonia yield of the optimized sample reached 2.617 mg/(h gcat),which was 5.6-fold as that of pristine BiOBr and higher than the reported BiOBr-based photocatalysts.The isotope labeled^(15)N_(2)was used to confirm that the ammonia is formed form the fixation of N_(2).Meanwhile,the sample also had good stability.After 4-time usage,the photocatalysts still had about 81.8%as the fresh sample.The results of this work provide a new way for optimizing the electronic structure of photocatalysts to achieve highly efficient photochemical N_(2) reduction.

关 键 词：BiOBr TCNQ Nitrogen reduction Electron accepter Photocatalysis。 

分 类 号：O643.36[理学—物理化学] O644.1[理学—化学] TQ113.2[化学工程—无机化工]