摘要
光生电荷的分离和转移被认为是影响BiVO_(4)基光阳极光电性能的核心因素之一.本文设计了在BiVO_(4)光阳极与析氧助催化剂之间插入空穴提取层的方法.Cu_(2)O作为空穴提取层引入到助催化剂层(FeOOH/NiOOH)和BiVO_(4)之间,可以有效优化空穴的迁移路径,延长光生空穴的寿命,从而提高电极的光电化学性能.与BiVO_(4)相比,调整后的BiVO_(4)/Cu_(2)O/FeOOH/NiOOH光阳极的电荷分离效率从70.6%提高到了92.0%.此外,该光阳极在1.23 VRHE(AM 1.5G照明下)下,还显示出了3.85 mA cm^(-2)的高光电流密度,是BiVO_(4)的2.77倍.我们的研究结果表明,电沉积Cu_(2)O空穴提取层是一种简单且可扩展的方法,能够有效提高BiVO_(4)的光电活性,可用于太阳能驱动水分解领域.
Photoinduced charge separation and transfer are the core factors affecting the photoelectrochemical performance of BiVO_(4)-based photoanodes.Herein,a hole extraction layer was inserted between a BiVO_(4)photoanode and an oxygen evolution cocatalyst(OEC).The introduction of Cu_(2)O as a hole extraction layer between the OEC layer(FeOOH/NiOOH)and BiVO_(4)optimized the migration paths and extended the lifetimes of the photogenerated holes,thus enhancing the photoelectrochemical performance of the photoelectrode.The charge separation efficiency of the optimized BiVO_(4)/Cu_(2)O/FeOOH/NiOOH photoanode was 92.0%significantly higher than the 70.6%efficiency for pure BiVO_(4).As expected,this photoanode also displayed a high photocurrent density of 3.85 mA cm^(-2)at 1.23 VRHE(under AM 1.5G illumination),which was 2.77 times greater than that of pure BiVO_(4).Our results indicate that electrodepositing a Cu_(2)O hole extraction layer is a simple and scalable method for increasing the photoelectrochemical activity of BiVO_(4)photoanodes for solar water splitting.
作者
田泽
王振霞
马自在
李晋平
王孝广
Ze Tian;Zhenxia Wang;Zizai Ma;Jinping Li;Xiaoguang Wang(Laboratory of Advanced Materials and Energy Electrochemistry,Institute of New Carbon Materials,College of Material Science and Engineering,Taiyuan University of Technology,Taiyuan,030024,China;College of Chemistry,Taiyuan University of Technology,Taiyuan,030024,China;Shanxi Key Laboratory of Gas Energy Efficient and Clean Utilization,Taiyuan University of Technology,Taiyuan,030024,China)
基金
supported by the National Natural Science Foundation of China(22008165 and 21878201)
the Natural Science Foundation of Shanxi Province(202303021211035)
the 7th Youth Talent Support Program of Shanxi Province
the Opening Project of Sichuan University of Science and Engineering,Material Corrosion and Protection Key Laboratory of Sichuan Province(2021CL22)。
