Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/151621
Title: Spatial engineering of a Co(OH)ₓ encapsulated p-Cu₂S/n-BiVO₄ photoanode : simultaneously promoting charge separation and surface reaction kinetics in solar water splitting
Authors: He, Bing
Wang, Yang
Liu, Xueqin
Li, Yinchang
Hu, Xiaoqin
Huang, Jing
Yu, Yongsheng
Shu, Zhu
Li, Zhen
Zhao, Yanli
Keywords: Science::Chemistry
Issue Date: 2019
Source: He, B., Wang, Y., Liu, X., Li, Y., Hu, X., Huang, J., Yu, Y., Shu, Z., Li, Z. & Zhao, Y. (2019). Spatial engineering of a Co(OH)ₓ encapsulated p-Cu₂S/n-BiVO₄ photoanode : simultaneously promoting charge separation and surface reaction kinetics in solar water splitting. Journal of Materials Chemistry A, 7(12), 6747-6752. https://dx.doi.org/10.1039/c9ta00171a
Project: RG5/16
RG11/17
RG114/17
Journal: Journal of Materials Chemistry A
Abstract: The photoelectrochemical (PEC) water splitting efficiency of a photoanode is restricted by charge recombination and sluggish reaction kinetics. Here, we demonstrated the spatial engineering of an ultrathin Co(OH)ₓ encapsulated p-Cu₂S/n-BiVO₄ photoanode for simultaneously enhancing charge separation and surface reaction kinetics in solar water splitting. Specifically, the separation efficiency of photoexcited charge carriers in the bulk was effectively improved due to the formation of a p-Cu₂S/n-BiVO₄ heterojunction, and the light-driven water oxidation reaction on the surface was further promoted because of the introduction of Co(OH)ₓ as an oxygen evolution catalyst (OEC) layer. As a result, the p-Cu₂S/n-BiVO₄ heterostructure yielded a largely enhanced charge separation efficiency of up to 79%, and a significant surface charge separation of 70% was achieved, attributed to the deposition of the Co(OH)ₓ cocatalyst. Furthermore, this synergistic effect in the photoanode gave rise to a remarkably enhanced photocurrent density of 3.51 mA cm⁻² at 1.23 V vs. the reversible hydrogen electrode. This spatial engineering provides an efficient strategy for the simultaneous improvement of internal and surface charge separation via dual modification, i.e., p-n heterojunction formation and OEC coating.
URI: https://hdl.handle.net/10356/151621
ISSN: 2050-7488
DOI: 10.1039/c9ta00171a
Rights: © 2019 The Royal Society of Chemistry. All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
Appears in Collections:SPMS Journal Articles

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