Using hollow dodecahedral NiCo-LDH with multi-active sites to modify BiVO4 photoanode facilitates the photoelectrochemical water splitting performance  

作　　者：Siwen Feng Shuyan Fan Ling Li Zeyu Sun Hongwen Tang Yan Xu Ling Fang Cuijuan Wang 

机构地区：[1]School of Chemistry,Southwest Jiaotong University,Chengdu 610031,China [2]Chongqing Institute of Green and Intelligent Technology,Chinese Academy of Sciences,Chongqing 400714,China

出　　处：《Nano Research Energy》2024年第3期50-60,共11页纳米能源研究（英文）

基　　金：financial support from the National Natural Science Foundation of China(No.21401151);Science and Technology Program of Sichuan Province(No.2021YFSY0048);Fundamental Research Funds for the Central Universities(No.2682023ZTPY064).

摘　　要：Photoelectrochemical(PEC)water splitting presents a promising approach for harnessing solar energy and converting it into hydrogen energy.However,the limited water oxidation activity of semiconductor photoanodes has severely hampered the overall conversion efficiency.In this study,a hollow dodecahedral structure of NiCo-LDH(HD-NiCo-LDH)was designed using the metal-organic framework ZIF-67 as a precursor.HD-NiCo-LDH was employed to modify the BiVO4 photoanode,serving as an oxygen evolution cocatalyst.HD-NiCo-LDH can enhance light absorption,accelerate photogenic hole extraction,promote photogenic charge separation and improve the kinetics of water oxidation reaction.Significantly,the unique hollow dodecahedral structure of HD-NiCo-LDH possesses a larger specific surface areas,which provides additional active sites for the water oxidation reaction and facilitates the adsorption of water molecules.The photocurrent density of the optimized HD-NiCo-LDH/BiVO4 photoanode reaches 4.54 mA/cm^(2)at 1.23 V vs.RHE,which is 3.3 times greater than the bare BiVO4 photoanode.This presented work introduces an innovative design concept for photoanodes supported by oxygen evolution cocatalysts with multi-active sites.

关 键 词：BIVO4 photoelectrochemical water splitting oxygen evolution cocatalysts layered double hydroxides 

分 类 号：O646[理学—物理化学]