Unraveling the role of Ti3C2 MXene underlayer for enhanced photoelectrochemical water oxidation of hematite photoanodes  

作　　者：Haiyan Ji Shan Shao Guotao Yuan Cheng Lu Kun Feng Yujian Xia Xiaoxin Lv Jun Zhong Hui Xu Jiujun Deng 

机构地区：[1]School of Materials Science and Engineering,Jiangsu University,Zhenjiang 212013,Jiangsu,China [2]Institute for Energy Research,Jiangsu University,Zhenjiang 212013,Jiangsu,China [3]Institute of Functional Nano and Soft Materials Laboratory(FUNSOM),Jiangsu Key Laboratory for Carbon-Based Functional Materials&Devices,Soochow University,Suzhou 215123,Jiangsu,China [4]Automotive Engineering Research Institute,Jiangsu University,Zhenjiang 212013,Jiangsu,China

出　　处：《Journal of Energy Chemistry》2021年第1期147-154,I0005,共9页能源化学（英文版）

基　　金：the support from the high-performance computing platform of Jiangsu University;The Jiangsu University Foundation (18JDG019);the Postdoctoral Foundation of Jiangsu Province (2018K072C);Six Talent Peak Project of Jiangsu Province (XLC-158);the China Postdoctoral Science Foundation (2019M651727, 2019M651719);the National Natural Science Foundation of China (21808090, 51902139, U1932211) financially supported this work。

摘　　要：Hematite is regarded as a promising photoanode for photoelectrochemical(PEC) water splitting.However,the charge recombination occurred at the interface of FTO/hematite strictly limits the PEC performance of hematite.Herein,we reported a Ti3C2 MXene underlayer modified hematite(Ti-Fe2O3) photoanode via a simple drop-casting followed by hydrothermal and annealing processes.Owing to the bifunctional role of Ti3C2 MXene underlayer in improving the interfacial properties of FTO/hematite and providing Ti source for the construction of Fe2 TiO5/Fe2O3 heterostructure in hematite nanostructure,the bulk and interfacial charge transfer dynamics of hematite are significantly enhanced,and consequently enhancing the PEC performance.Compared with the pristine hematite,the as-prepared Ti-Fe2O3 photoanode shows an increased photocurrent density from 0.80 mA/cm^(2) to 1.30 mA/cm^(2) at 1.23 V vs.RHE.Moreover,a further promoted PEC performance including a dramatically increased photocurrent density of 2.49 mA/cm^(2) at1.23 V vs.RHE and an obviously lowered onset potential is achieved for the Ti-Fe2O3 sample after the subsequent surface F-treatment and the loading of FeNiOOH cocatalyst.Such results suggest that the introduction of Ti3C2 MXene underlayer is a facile but effective approach to improve the PEC water splitting activity of hematite.

关 键 词：HEMATITE PHOTOELECTROCHEMICAL Water splitting Ti3C2 MXene UNDERLAYER 

分 类 号：TB383.1[一般工业技术—材料科学与工程]