New insight into the effect of interface supercapacitance on the performance of titanium dioxide/carbon nanowire array for photoelectrochemical water oxidation  

作　　者：Zhuofeng Hu Weiqing Guo 

机构地区：[1]School of Environmental Science and Engineering,Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology,Sun Yat-sen University,Guangzhou 510006,China [2]School of Environmental and Chemical Engineering,Foshan University,Foshan 528000,China

出　　处：《Chinese Chemical Letters》2021年第11期3359-3363,共5页中国化学快报（英文版）

基　　金：supported by the National Natural Science Foundation of China(No.51902357);the Natural Science Foundation of Guangdong Province,China(No.2019A1515012143);the Start-up Funds for High-Level Talents of Sun Yat-sen University(No.38000-18841209);the Fundamental Research Funds for the Central Universities(No.191gpy153).

摘　　要：The electrode/electrlyte interface is of great signifance to photoelectrochemical(PEC)water oxidation as the reaction mainly occur here.Herein,we focus on the effect of supercapactance of the electrode/electrlyte interface on the performance of PEC.It is discovered that the supercapacitor on the interface is crucial because it links the charge transport and solution ion adsorption on its two sides.In this study,we demonstrate an approach to promote the performance of TiO_(2)nanowire array(TiO_(2)NWs)photoanode in photoelectrochemical cells(PECs)by increasing its supercapacitance.A 2−5 nm carbon layer was coated and the interface supercapacitance increases by about 150 times.This enhances the separation rate of electron-hole pairs by collecting more holes.Meanwhile,it also promotes the water oxidation rate by adsorbing more OH−on its surface.As a result,the photocurrent density of C-TiO_(2)NWs was about 8 times higher than that of its carbon-free counterpart.This approach of increasing the supercapacitance of photoanodes would be attractive for enhancement of the efficiency of PECs and this work demonstrate the importance of supercapacitance of the interface for PECs.

关 键 词：TiO_(2) CARBON SUPERCAPACITOR PHOTOELECTROCHEMICAL Water oxidation 

分 类 号：TM53[电气工程—电器] TB383.1[一般工业技术—材料科学与工程]