Surface modification by ligand growth strategy for dense copper bismuth film as photocathode to enhance hydrogen production activity  

作　　者：Zhouzhou WANG Qingwei WU Jieming WANG Ying YU 

机构地区：[1]Institute of Nanoscience and Nanotechnology,College of Physical Science and Technology,Central China Normal University,Wuhan 430079,China

出　　处：《Frontiers in Energy》2024年第1期89-100,共12页能源前沿（英文版）

基　　金：supported by the National Key R&D Program of China(Grant No.2022YFB3803600);the National Natural Science Foundation of China(Grant No.U20A20246);the Fundamental Research Funds for the Central Universities,China.

摘　　要：Hydrogen production from photoelectrochemical(PEC)water splitting has been regarded as a promising way to utilize renewable and endless solar energy.However,semiconductor film grown on photoelectrode suffers from numerous challenges,leading to the poor PEC performance.Herein,a straightforward sol-gel method with the ligand-induced growth strategy was employed to obtain dense and homogeneous copper bismuthate photocathodes for PEC hydrogen evolution reaction.By various characterizations,it was found that the nucleation and surface growth of CuBi_(2)O_(4)layer induced by 2-methoxyethanol ligand(2-CuBi_(2)O_(4))demonstrated a decent crystallinity and coverage,as well as a large grain size and a low oxygen vacancy concentration,leading to the good ability of light absorption and carrier migration.Consequently,under simulated sunlight irradiation(AM1.5G,100 mW/cm^(2)),the 2-CuBi_(2)O_(4)photocathode achieved an enhanced photocurrent density of−1.34 mA·cm^(−2)at 0.4 V versus the reversible hydrogen electrode and a promising applied bias photon-to-current efficiency of 0.586%.This surface modification by ligand growth strategy will shed light on the future design of advanced photoelectrodes for PEC water splitting.

关 键 词：copper bismuthate PHOTOCATHODE ligand growth strategy dense film PEC 

分 类 号：TQ116.2[化学工程—无机化工]