Surface treatment of GaN nanowires for enhanced photoelectrochemical water-splitting  

作　　者：Wenhao Chen Jian Du Hanbin Zhang Hancheng Wang Kaicheng Xu Zhujun Gao Jiaming Tong Jin Wang Junjun Xue Ting Zhi Longlu Wang 

机构地区：[1]College of Integrated Circuit Science and Engineering,Nanjing University of Posts and Telecommunications,Nanjing 210023,China [2]College of Electronic and Optical Engineering&College of Flexible Electronics(Future Technology),Nanjing University of Posts and Telecommunications,Nanjing 210023,China

出　　处：《Chinese Chemical Letters》2024年第9期398-402,共5页中国化学快报（英文版）

基　　金：funded by the National Key R&D Program of China(No.2021YFB3601600);Innovation Support Programme(Soft Science Research)Project Achievements of Jiangsu Province(No.BK20231514);the National Nature Science Foundation of China(Nos.61974062,62004104);the Leading-edge Technology Program of Jiangsu Natural Science Foundation(No.BE2021008–2);The Fundamental Research Foundation for the Central Universities;Collaborative Innovation Center of Solid-State Lighting and Energy-Saving Electronics。

摘　　要：High-efficiency hydrogen production through photoelectrochemical(PEC)water splitting has emerged as a promising solution to address current global energy challenges.Ⅲ-nitride semiconductor photoelectrodes with nanostructures have demonstrated great potential in the near future due to their high light absorption,tunable direct band gap,and strong physicochemical stability.However,several issues,including surface trapping centers,surface Fermi level pinning,and surface band bending,need to be addressed.In this work,enhanced photovoltaic properties have been achieved using gallium nitride(GaN)nanowires(NWs)photoelectrodes by adopting an alkaline solution surface treatment method to reduce the surface states.It was found that surface oxides on NWs can be removed by an alkaline solution treatment without changing the surface morphology through X-ray photoelectron spectroscopy(XPS),scanning electron microscopy(SEM)and other characterization methods.These findings provide new insights to the development of high-efficiency photoelectrodes for new energy source applications.

关 键 词：Water splitting Photoelectrochemical cells Gallium nitride Surface treatment Nano-architectures 

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