Photothermal‐boosted polaron transport in Fe_(2)O_(3)photoanodes for efficient photoelectrochemical water splitting  

作　　者：Xiaoqin Hu Jing Huang Yu Cao Bing He Xun Cui Yunhai Zhu Yang Wang Yihuang Chen Yingkui Yang Zhen Li Xueqin Liu 

机构地区：[1]State Key Laboratory of New Textile Materials and Advanced Processing Technologies,Wuhan Textile University,Wuhan,Hubei,China [2]Faculty of Materials Science and Chemistry,China University of Geosciences,Wuhan,Hubei,China [3]College of Chemistry and Materials Engineering,Wenzhou University,Wenzhou,Zhejiang,China

出　　处：《Carbon Energy》2023年第9期38-48,共11页碳能源（英文）

基　　金：This work was supported by the National Natural Science Foundation of China(51902297,52002361,52003300,and 22109120);the Zhejiang Provincial Natural Science Foundation of China(LQ21B030002);the fund of the Key Laboratory of Catalysis and Energy Materials Chemistry of Ministry of Education,and Hubei Key Laboratory of Catalysis and Materials Science.

摘　　要：Introduction of the photothermal effect into transition-metal oxide photoanodes has been proven to be an effective method to improve the photoelectrochemical(PEC)water-splitting performance.However,the precise role of the photothermal effect on the PEC performance of photoanodes is still not well understood.Herein,spinel-structured ZnFe_(2)O_(4)nanoparticles are deposited on the surface of hematite(Fe_(2)O_(3)),and the ZnFe_(2)O_(4)/Fe_(2)O_(3)photoanode achieves a high photocurrent density of 3.17 mA cm^(-2)at 1.23 V versus a reversible hydrogen electrode(VRHE)due to the photothermal effect of ZnFe_(2)O_(4).Considering that the hopping of electron small polarons induced by oxygen vacancies is thermally activated,we clarify that the main reason for the enhanced PEC performance via the photothermal effect is the promoted mobility of electron small polarons that are bound to positively charged oxygen vacancies.Under the synergistic effect of oxygen vacancies and the photothermal effect,the electron conductivity and PEC performance are significantly improved,which provide fundamental insights into the impact of the photothermal effect on the PEC performance of small polaron-type semiconductor photoanodes.

关 键 词：Fe_(2)O_(3)nanorods oxygen vacancies photoelectrochemical performance photothermal effect small polaron transport 

分 类 号：O46[理学—电子物理学]