首页|Energy band modulation of N-doped rutile/anatase TiO2 photoanode promoting charge separation toward prominent photoelectrochemical performance
Energy band modulation of N-doped rutile/anatase TiO2 photoanode promoting charge separation toward prominent photoelectrochemical performance
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To solve the problem of high photogenerated carrier recombination rate and low photoelectric conver-sion efficiency of TiO2-based materials,a simple N-doped anatase/rutile TiO2 heterophase nanorod film was designed by a low-temperature hydrothermal method in this work.The enhanced separation and transport of photogenerated charges were facilitated by the smaller contact barrier and appropriate band matching between anatase TiO2 nanoparticles and rutile TiO2 nanorods.The introduction of N doping in anatase TiO2 resulted in an upward shift of the valence band and a narrowing of the band gap,conse-quently enhancing the efficiency of visible light utilization.The combination of the heterophase junction and N-doping exhibited a synergistic effect,effectively suppressing the recombination of photogenerated charges and enhancing the photoelectric conversion efficiency of the photoanode.Under AM 1.5G irradiation,the photocurrent density(J)of the A-TO(N)@R-TONR photoanode reached 2.19 mA·cm-2(VRHE,1.23 eV).Additionally,the incident photon-electron conversion efficiency(IPCE)and the charge injection efficiency(η)reached 81.4％and 51.6％at 320 nm.Furthermore,the J,IPCE,and η values of the A-TO(N)@R-TONR photoanode were 2.96,2.1 and 3.2 times those of pure R-TONR photoanode,respectively.This work presents a rational strategy for designing effi-cient TiO2-based photoanodes.
TiO2Heterophase junctionPhotoanode
Juan Gao、Shi-Xuan Wang、Jia-Le Deng、Ping-Ping Wei、Fu-Zhang Chen、Ling-Cheng Zheng、Yue-Qin Wang、Yang Li、Yin Liu、Gang He
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School of Mechanics and Photoelectric Physics,Anhui University of Science and Technology,Huainan 232001,China
School of Materials Science and Engineering,Anhui University,Hefei 230039,China
Tianneng Battery(Wuhu)Co.,Ltd.,Wuhu 241000,China
School of Materials Science and Engineering,Anhui University of Science and Technology,Huainan 232001,China
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University Natural Science Research Project of Anhui ProvinceGraduate Innovation Fund of Anhui ProvinceNational Natural Science Foundation of China
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