Insight into the improvement mechanism of Co-Pi-modified hematite nanowire photoanodes for solar water oxidation  

作　　者：Xu Zhou Chunyan Wang Fulin Liu Chengyu He Shiming Zhang 

机构地区：[1]Key Laboratory of Flexible Electronics(KLOFE)&Institute of Advanced Materials(IAM),Nanjing Tech University(NanjingTech),Nanjing 211816,China [2]Jiangsu Seenbom Flexible Electronics Institute Co.,Ltd.,Nanjing 210061,China

出　　处：《Chinese Chemical Letters》2021年第10期3261-3263,共3页中国化学快报（英文版）

基　　金：financially supported by the National Natural Science Foundation of China (No.21503109);the Research-Starting Funds for Introduced Talents of Nanjing Tech University。

摘　　要：The composite photoanodes composed by cobalt phosphate catalyst(Co-Pi) modified semiconductor have been widely used for solar water splitting,but the improvement mechanism has not been experimentally confirmed.Here we use transient photoelectrochemical measurements and impedance spectroscopy to investigate the effect of Co-Pi catalyst on hematite nanowire photoanode.It is found that under illumination the Co-Pi catalyst can efficiently promote the transfer of photo-generated holes to the Co-Pi layer by increasing the electrical conductivity of the composite structure under a low potential.The Co-Pi catalyst can recombine with photo-generated electrons to reduce the surface recombination efficiency of photo-generated holes and electrons under a high potential.These results provide important new understanding of the performance improvement mechanism for the Co-Pi-modified semiconductor nanowire composite photoanodes.

关 键 词：Semiconductor nanowires Oxygen-evolving catalyst Composite structure Water oxidation mechanism 

分 类 号：TQ116.2[化学工程—无机化工] TQ426[一般工业技术—材料科学与工程] TB383.1