Boosting charge separation of BiVO_(4)photoanode modified with 2D metal-organic frameworks nanosheets for high-performance photoelectrochemical water splitting  

作　　者：Lina Wang Zejun Liu Jinming Zhang Yuefa Jia Jingwei Huang Qiong Mei Qizhao Wang 

机构地区：[1]School of Water and Environment,Key Laboratory of Subsurface Hydrology and Ecological Effects in Arid Region of Ministry of Education,Chang’an University,Xi’an 710054,China [2]College of Chemistry and Chemical Engineering,Northwest Normal University,Lanzhou 730070,China [3]School of Land Engineering,Chang’an University,Xi’an 710054,China

出　　处：《Chinese Chemical Letters》2023年第6期287-292,共6页中国化学快报（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(No.52173277);the Innovative Research Team for Science and Technology of Shaanxi Province(No.2022TD-04);the Fundamental Research Funds for the Central Universities of Chang’an University(Nos.300102299304,300102291403);the Natural Science Basic Research Fund of Shaanxi Province(No.2020JZ-20)。

摘　　要：Water splitting by photoelectrochemical(PEC)processes to convert solar energy into hydrogen energy using semiconductors is regarded as one of the most ideal methods to solve the current energy crisis and has attracted widespread attention.Herein,Co-based metal-organic framework(Co(bpdc)(H_(2)O)_(4)(CoMOF)nanosheets as passivation layers were in-situ constructed on the surface of Bi VO_(4)films through an uncomplicated hydrothermal method(Co-MOF/Bi VO_(4)).Under AM 1.5G illumination,synthesized CoMOF/BiVO_(4)electrode exhibited a 4-fold higher photocurrent than bare Bi VO_(4),measuring 6.0 m A/cm^(2)at 1.23 V vs.RHE in 1 mol/L potassium borate electrolyte(pH 9.5)solution.Moreover,the Co-MOF/BiVO_(4)film demonstrated a 96%charge separation efficiency,a result caused by an inhibited recombination rate of photogenerated electrons and holes by the addition of Co-MOF nanosheets.This work provides an idea for depositing inexpensive 2D Co-MOF nanosheets on the photoanode as an excellent passivation layer for solar fuel production.

关 键 词：PHOTOELECTROCHEMICAL BiVO_(4) Water splitting Co-MOF 2D nanosheets Charge separation 

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