FeF_(x) and Fe_(2)ZrO_(5) Co-modified hematite for highly efficient solar water splitting  

作　　者：Xiaoquan Zhao Cheng Lu Shuo Li Yufeng Chen Gaoteng Zhang Duo Zhang Kun Feng Jun Zhong 

机构地区：[1]Institute of Functional Nano and Soft Materials Laboratory(FUNSOM),Jiangsu Key Laboratory for Carbon-Based Functional Materials&Devices,Soochow University,Suzhou 215123,Jiangsu,China [2]State Key Laboratory of Radiation Medicine and Protection,School of Radiation Medicine and Protection,Soochow University,Suzhou 215123,Jiangsu,China

出　　处：《Journal of Energy Chemistry》2022年第6期414-420,I0012,共8页能源化学（英文版）

基　　金：supported by the National Key R&D Program of China (2020YFA0406103);the National Natural Science Foundation of China (U1932211);the Collaborative Innovation Center of Suzhou Nano Science & Technology, the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD);the 111 Project。

摘　　要：Hematite is an excellent catalyst for photoelectrochemical (PEC) water splitting but its performance has been highly limited by poor conductivity and high charge recombination.Here by a Zr-based treatment to create bulk Fe_(2)ZrO_(5) in hematite and a F-based treatment to form an ultrathin surface FeF_(x) layer,the charge transfer can be highly improved and the charge recombination can be significantly suppressed.As a result,the FeF_(x) /Zr-Fe_(2)O_(3) photoanode presents an enhanced PEC performance with a photocurrent density of 2.43 m A/cm^(2)at 1.23 V vs.RHE,which is around 3 times higher than that of the pristine Fe_(2)O_(3) .The FeF_(x) /Zr-Fe_(2)O_(3) photoanode also shows a low onset potential of 0.77 V vs.RHE (100 mV lower than the pristine hematite).The performance is much higher than that of the sample treated by Zr or F alone,suggesting the synergistic effect between bulk Fe_(2)ZrO_(5) and surface FeF_(x) .By coupling with the FeNiOOH co-catalyst,the final photoanode can achieve a high photocurrent density of 2.81 mA/cm^(2) at 1.23 V vs.RHE.The novel design of Zr and F co-modified hematite can be used as a promising way to prepare efficient catalysts for solar water splitting.

关 键 词：HEMATITE Fe_(2)ZrO_(5) FLUORINATION Solar water splitting 

分 类 号：TQ116.2[化学工程—无机化工] O643.36[理学—物理化学]