Self-assembled CoOOH on TiO2 for enhanced photoelectrochemical water oxidation

• 作者: Xiangrong Ren Yujin Ji Yiyue Zhai Ningyi Yuan Jianning Ding Youyong Li Junqing Yan Shengzhong Frank Liu
• 来源期刊: 能源化学
• 年，卷（期）: 2021,（9）
• 页码范围: 512-521
• 页数: 10页
• 语种: 英文

摘要

Providing efficient charge transfer through the interface between the semiconductor and co-catalyst is greatly desired in photoelectrocatalytic(PEC)energy conversion.Herein,we excogitate a novel and facile means,via electrochemical activation,to successfully load the amorphous CoOOH layer architecture onto the surface of TiO2.Intriguingly,the as-obtained 6％CoOOH-TiO2 photoelectrode manifests optimal PEC performance with a high photocurrent density of 1.3 mA/cm2,3.5 times higher than that of pristine TiO2.Electrochemical impedance spectroscopy(EIS),Tafel analysis and cyclic voltammetry(CV)methods show that the carrier transfer barrier within the electrode and the transition of Co3+ OOH to Co4+ OOH have the dominating effects on the PEC performance.Theoretical calculation reveals that the interface between the CoOOH and TiO2 improves the homogeneity of effective d-orbital electronic-transfer ability among Co sites.This research sheds light on the water oxidation reaction and the design of more favorable PEC co-catalysts.