Boosting Photocatalytic Oxygen Evolution:Purposely Constructing Direct Z-Scheme Photoanode by Modulating the Interface Electric Field  

作　　者：LI Yinyin WU Qiannan ZHANG Kai HU Bin LIN Yanhong WANG Dejun XIE Tengfeng 

机构地区：[1]Institute of Physical Chemistry,College of Chemistry,Jilin University,Changchun 130012,P.R.China [2]State Key Laboratory of Inorganic Synthesis and Preparative Chemistry,College of Chemistry,Jilin University,Changchun 130012,P.R.China [3]College of Chemistry,Jilin University,Changchun 130012,P.R.China

出　　处：《Chemical Research in Chinese Universities》2020年第6期1059-1067,共9页高等学校化学研究（英文版）

基　　金：Supported by the National Natural Science Foundation of China(Nos.51572106,21773086,21872063).

摘　　要：Ti-Fe2O3 photoanode has received widespread attention in photoelectrochemical(PEC)water spilling because of its optimized oxidative and reductive capability of composites catalyst.However,its low efficiency could limit its development.Herein,in order to improve the efficiency of PEC water spilling,the all-solid-state direct Z-scheme Ti-ZnFe2O4/Ti-Fe2O3(TZFO/Ti-Fe2O3)nanorod arrays composited with the ideal energy band structure are synthesized by modulating the Fermi level of TZFO for PEC water splitting.The photophysical methods in this work,including the Kelvin probe measurement and transient photovoltage spectroscopy(TPV)measurement,are applied to explore the migration behavior of electric charges at the enhanced interface electric field.Finally,the Z-scheme charge transfer mechanism of TZFO/Ti-Fe2O3 photoanode is proved successfully.Benefiting from the desirable charge transfer at interface electric field,the TZFO/Ti-Fe2O3 exhibits the outstanding photocatalytic oxygen evolution reaction(OER)performance,and the photocurrent of 60TZFO/Ti-Fe2O3 photoanode reaches 2.16 mA/cm^2 at 1.23 V vs.reversible hydrogen electrode(RHE),which is three times higher than that of pure Ti-Fe2O3 photoanode.This work provides a facile approach of modulating interface electric field to optimize the Z-scheme charge-transfer process.

关 键 词：Ti-ZnFe2O3/Ti-Fe2O3 Z-Scheme Interface electric field Heterojunction photoanode 

分 类 号：O644.1[理学—物理化学]