Engineering efficient hole transport layer Ferrihydrite-MXene on BiVO4 photoanodes for photoelectrochemical water splitting: Work function and conductivity regulated

Bai, Weihao ¹Zhou, Ye ¹Peng, Gang ¹Wang, Jinnan ¹Li, Aimin ¹Corvini, Philippe Francois-Xavier

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作者信息

1. Nanjing Univ
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Abstract

Although great interest is focused on development of semiconductor photoanodes for efficient photo electrochemical (PEC) water splitting, the pressing bottleneck to address the intrinsic charge transport for enhancement of PEC performance still remains to be resolved. Herein, hole transport layer (Fh-MXene) constructed by doping of MXene (Ti3C2) in Ferrihydrite (Fh) is loaded on BiVO4 photoanode. This novel BiVO4@Fh-MXene photoanode achieves high current density of 4.55 mA cm(-2) at 1.23 V versus reversible hydrogen electrode (vs. RHE), exhibiting excellent photostability. From electrochemical analysis and density functional theory calculations, high PEC performance is ascribed to incorporation of Fh-MXene as hole transport layer, enhancing conductivity and water oxidation reaction. Notably, MXene can improve band alignment of BiVO4/Fh-MXene interface by tuning work function, which strengthens the built-in electric field for more efficient hole extraction. This work provides a simple method to design photoanodes with efficient charge transport layers for feasible PEC water splitting application.

Key words

Ferrihydrite-MXene/BiVO(4 )photoanodes/Photoelectrochemical water splitting/Hole transport layer/Work function and conductivity regulated/PERFORMANCE/SEMICONDUCTORS/FABRICATION/TIO2

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出版年

2022

Applied Catalysis

ISSN：0926-3373

被引量35

参考文献量59

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