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

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Authors
Bai, Weihao
Zhou, Ye
Peng, Gang
Wang, Jinnan
Li, Aimin
Author (Corporation)
Publication date
2022
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01A - Journal article
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Parent work
Applied Catalysis B: Environmental
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DOI of the original publication
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Volume
315
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Elsevier
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Abstract
Although great interest is focused on development of semiconductor photoanodes for efficient photoelectrochemical (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.
Keywords
Ferrihydrite-MXene, BiVO4 photoanodes, Photoelectrochemical water splitting, Hole transport layer, Work function and conductivity regulated
Subject (DDC)
500 - Naturwissenschaften
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1873-3883
0926-3373
Language
English
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Yes
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Publication status
Published
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Closed
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Citation
BAI, Weihao, Ye ZHOU, Gang PENG, Jinnan WANG, Aimin LI und Philippe CORVINI, 2022. Engineering efficient hole transport layer Ferrihydrite-MXene on BiVO4 photoanodes for photoelectrochemical water splitting: Work function and conductivity regulated. Applied Catalysis B: Environmental. 2022. Bd. 315. DOI 10.1016/j.apcatb.2022.121606. Verfügbar unter: https://irf.fhnw.ch/handle/11654/33941