Nitrogen incorporated oxygen vacancy enriched MnCo_(2)O_(x)/BiVO_(4) photoanodes for efficient and stable photoelectrochemical water splitting  

作　　者：Liangcheng Xu Yingjuan Zhang Boyan Liu Xin Wang Gangqiang Zhu Lianzhou Wang Songcan Wang Wei Huang 

机构地区：[1]Frontiers Science Center for Flexible Electronics,Xi’an Institute of Flexible Electronics(IFE),Northwestern Polytechnical University,127 West Youyi Road,Xi’an 710072,China [2]School of Physics and Information Technology,Shaanxi Normal University,Xi’an 710062,China [3]Nanomaterials Centre,Australian Institute for Bioengineering and Nanotechnology and School of Chemical Engineering,The University of Queensland,Brisbane,Queensland 4072,Australia [4]Research&Development Institute of Northwestern Polytechnical University in Shenzhen,Sanhang Science&Technology Building,No.45th,Gaoxin South 9th Road,Nanshan District,Shenzhen 518063,China

出　　处：《Nano Research》2024年第3期1140-1150,共11页纳米研究（英文版）

基　　金：The authors would like to acknowledge the financial support from National Natural Science Foundation of China(No.52002328);Shenzhen Science and Technology Program(No.JCYJ20220530161615035);the Practice and Innovation Funds for Graduate Students of Northwestern Polytechnical University(No.PF2023151);the Fundamental Research Funds for the Central Universities,and material characterizations from the Analytical&Testing Center of Northwestern Polytechnical University.

摘　　要：Oxygen vacancies in oxygen evolution cocatalysts(OECs)can significantly improve the photoelectrochemical(PEC)water splitting performance of photoanodes.However,OECs with abundant oxygen vacancies have a poor stability when exposing to the highly-oxidizing photogenerated holes.Herein,we partly fill oxygen vacancies in a MnCo_(2)O_(x) OEC with N atoms by a combined electrodeposition and sol-gel method,which dramatically improves both photocurrent density and stability of a BiVO_(4) photoanode.The optimized N filled oxygen vacancy-rich MnCo_(2)O_(x)/BiVO_(4) photoanode(3 at.%of N)exhibits an outstanding photocurrent density of 6.5 mA·cm^(-2) at 1.23 VRHE under AM 1.5 G illumination(100 mW·cm^(-2)),and an excellent stability of over 150 h.Systematic characterizations and theoretical calculations demonstrate that N atoms stabilize the defect structure and modulate the surface electron distribution,which significantly enhances the stability and further increases the photocurrent density.Meanwhile,other heteroatoms such as carbon,phosphorus,and sulfur are confirmed to have similar effects on improving PEC water splitting performance of photoanodes.

关 键 词：water splitting oxygen evolution bismuth vanadate(BiVO_(4)) filling oxygen vacancies COCATALYSTS 

分 类 号：O643.3[理学—物理化学]