N_(2)photofixation promoted by in situ photoinduced dynamic iodine vacancies at step edge in Bi_(5)O_(7)I nanotubes  

作　　者：Xing’an Dong Kaiwen Wang Zhihao Cui Xian Shi Zhiming Wang Fan Dong 

机构地区：[1]Research Center for Carbon-Neutral Environmental&Energy Technology,Institute of Fundamental and Frontier Sciences,University of Electronic Science and Technology of China,Chengdu 611731,China [2]Beijing Key Lab of Microstructure and Properties of Advanced Materials,Beijing University of Technology,Beijing 100124,China [3]Department of Chemistry and Biochemistry,The Ohio State University,Columbus,Ohio 43210,USA

出　　处：《Nano Research》2023年第5期6679-6686,共8页纳米研究（英文版）

基　　金：the National key Research and Development project of China(No.2020YFA0710000);the National Natural Science Foundation of China(Nos.22225606,22176029,and 21822601);the Sichuan Natural Science Foundation for Distinguished Scholars(No.2021JDJQ0006);the Fundamental Research Funds for the Central Universities(No.ZYGX2019Z021).

摘　　要：Heterogeneous photosynthesis is a promising route for sustainable ammonia production,which can utilize renewable energy and water as the hydrogen source under ambient condition.In this study,a series of Bi_(5)O_(7)I(BOI)nanosheets and nanotubes are synthesized,the surface tensile strain is formed by curling the nanosheets into nanotubes to tune the concentration and location of dynamic vacancies.Scanning transmission electron microscopy(STEM)with spherical aberration correction confirms the presence of intrinsic areal defects on the surface of the BOI nanotube resulted from surface tensile strain.The presence of areal defects lowers the formation energy of I vacancies(IV)at step edge site,thus the IV with higher concentration would be favorably generated under visible light.Rapid scan in situ Fourier transform infrared(FT-IR)analysis in the aqueous media reveals that the IV promotes photocatalytic N_(2) activation and reduction,proceeds through an associative alternating mechanism.Specially,after turning off the light,the surface vacancy sites can be reoccupied by I−ions,which enables the protection and regeneration of photocatalyst surface in an aerobic and dark environment.This work provides an innovative strategy to tune concentration and location of dynamic surface vacancies on photocatalysts by building surface tensile strain for advancing sustainable ammonia production.

关 键 词：nitrogen fixation halogen vacancy PHOTOREDUCTION surface tensile strain rapid scan in situ Fourier transform infrared(FTIR) 

分 类 号：TB383[一般工业技术—材料科学与工程]