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 f...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.展开更多
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)+2 种基金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.
文摘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.
