Energy band modulation of N-doped rutile/anatase TiO_(2) photoanode promoting charge separation toward prominent photoelectrochemical performance  

作　　者：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 

机构地区：[1]School of Mechanics and Photoelectric Physics,Anhui University of Science and Technology,Huainan 232001,China [2]School of Materials Science and Engineering,Anhui University,Hefei230039,China [3]Tianneng Battery(Wuhu)Co.,Ltd.Wuhu 241000,China [4]School of Materials Science and Engineering,Anhui University of Science and Technology,Huainan 232001,China

出　　处：《Rare Metals》2024年第8期3784-3797,共14页稀有金属（英文版）

基　　金：financially supported by the University Natural Science Research Project of Anhui Province(No.2022AH050848);the Graduate Innovation Fund of Anhui Province(No.2022xscx082);the National Natural Science Foundation of China(No.12304134)。

摘　　要：To solve the problem of high photogenerated carrier recombination rate and low photoelectric conversion efficiency of TiO_(2)-based materials,a simple N-doped anatase/rutile TiO_(2) 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 TiO_(2)nanoparticles and rutile TiO_(2) nanorods.The introduction of N doping in anatase TiO_(2) resulted in an upward shift of the valence band and a narrowing of the band gap,consequently 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 reached2.19 mA·cm^(-2)(V_(RHE,1.23 eV)).Additionally,the incident photon-electron conversion efficiency(IPCE)and the charge injection efficiency(η)reached 81.4%and 51.6%at320 nm.Furthermore,the J,IPCE,andηvalues of the A-TO(N)@R-TONR photoanode were 2.96,2.1 and 3.2times those of pure R-TONR photoanode,respectively.This work presents a rational strategy for designing efficient TiO_(2)-based photoanodes.

关 键 词：TiO_(2) Heterophase junction PHOTOANODE 

分 类 号：TQ116.2[化学工程—无机化工] O644.1[理学—物理化学]