Internal magnetic-field-enhanced photogenerated charge separation in ferromagnetic TiO_(2)surface heterojunctions  

作　　者：Guojing Wang Shirong Xiong Yonghui Chen Chunchang Wang Shasha Lv Ke Jia Yunjie Xiang Jianbo Liu Chong Liu Zhengcao Li 

机构地区：[1]School of Materials and Energy,Lanzhou University,Lanzhou 730000,China [2]State Key Laboratory of New Ceramics and Fine Processing,Key Laboratory of Advanced Materials(MOE),School of Materials Science and Engineering,Tsinghua University,Beijing 100084,China [3]Laboratory of Dielectric Functional Materials,School of Physics and Material Science,Anhui University,Hefei 230601,China [4]Key Laboratory of Beam Technology,Ministry of Education,College of Nuclear Science and Technology,Beijing Normal University,Beijing 100875,China [5]School of Materials and Energy,Southwest University,Chongqing 404100,China

出　　处：《Journal of Materials Science & Technology》2023年第29期240-247,共8页材料科学技术(英文版)

基　　金：the China Postdoctoral Science Foundation(Grant No.2021M701829);It was also sup-ported by the Natural Science Foundation of Gansu Province in China(Grant No.22JR5RA484);Fundamental Research Funds for the Central University(Nos.lzujbky-2021-61 and SWU-KT22001);State Key Laboratory of New Ceramic and Fine Processing Ts-inghua University(No.KF202118);The authors would like to thank Tsinghua-Deqing Joint Research center for Materials Design and Industrial Innovation for the support.The authors would like to thank Shiyanjia Lab(www.shiyanjia.com)for the support provided for hydrogen generation,SS-SPV measurement,ESR test,DFT cal-culations,and modification polish.

摘　　要：The use of the internal magnetic field of ferromagnets can effectively promote charge separation and transfer(CST)in photoelectrochemical energy conversion.However,photoelectrochemical materials with a ferromagnetic field are scarce,and the internal magnetic field is negligible in nonferromagnetic mate-rials.To address this issue,we propose a rational method for preparing ferromagnetic TiO_(2)powder using controllable oxygen vacancies in anatase TiO_(2)with co-exposed{001}and{101}facets.Accordingly,an ex-cellent saturation magnetisation of 0.0014 emu/g in TiO_(2)is achieved owing to an asymmetric and uneven charge distribution.Compared with that of nonferromagnetic TiO_(2),the efficiency of photocatalytic hydro-gen generation of ferromagnetic TiO_(2)is improved by 0.64 times.The enhancement of photocatalytic hy-drogen generation is due to the different forces exerted on the electrons and holes in the magnetic field,which significantly improve the photogenerated CST efficiency of ferromagnetic TiO_(2).This result high-lights the significant role of the synergistic regulation of the crystal structure and defects in regulating the ferromagnetic characteristics of materials.The findings of this study provide guidance for leveraging point defects to promote CST for high-efficiency solar-energy conversion systems.

关 键 词：PHOTOCATALYSIS TiO_(2){001}-{101}surface heterojunctions Oxygen vacancies FERROMAGNETIC 

分 类 号：X701[环境科学与工程—环境工程] O643.36[理学—物理化学] O644.1[理学—化学]