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Elucidating the dynamics and transfer pathways of photogenerated charge carriers in V2O5/BiVO4 heterojunction photoanodes: A transient absorption spectroscopy study. / Yaw, C.S.; Günnemann, C.; Bahnemann, D.W.; Chong, M.N.

In: Journal of Alloys and Compounds, Vol. 1010, 177011, 05.01.2025.

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Yaw, C.S. ; Günnemann, C. ; Bahnemann, D.W. ; Chong, M.N. / Elucidating the dynamics and transfer pathways of photogenerated charge carriers in V2O5/BiVO4 heterojunction photoanodes: A transient absorption spectroscopy study. In: Journal of Alloys and Compounds. 2025 ; Vol. 1010.

BibTeX

@article{d908c0efc2294747ab41e0bb5eb7de1a,
title = "Elucidating the dynamics and transfer pathways of photogenerated charge carriers in V2O5/BiVO4 heterojunction photoanodes: A transient absorption spectroscopy study",
abstract = "Pairing of bismuth vanadate (BiVO4) with vanadium pentoxide (V2O5) forms a Type II heterojunction photoanode, which has been proven to be a high-performance photoanode architecture for efficient photoelectrochemical (PEC) water oxidation. To further support for advanced rational design and improvement of the heterojunction photoanode, it is quintessential to understand the mechanics and properties of photogenerated charge carriers formed. This study aims to probe the dynamics of photogenerated electron-hole pairs formed in pristine photoanode as well as the heterojunction photoanodes using transient absorption spectroscopy (TAS). Relative to the BiVO4/V2O5 structure, modelling and quantification of the decay constant helps in explaining why the V2O5/BiVO4 heterojunction photoanode exhibited a longer lifetime of the photogenerated charge carriers with a lower decay rate constant that leads to a much-improved overall generation of photocurrent density. An oxygen evolving catalyst of nickel oxyhydroxide (NiOOH) was then anchored on the exterior surfaces of the heterojunction photoanode system to further investigate and modify the transfer pathways of the photogenerated charge carriers. Furthermore, the hole- and scavenger-assisted TAS measurements on the BiVO4/V2O5 heterojunction photoanode revealed that the majority of trapped holes species are accumulated within the BiVO4 layer. The findings suggested that the Type II heterojunction formation in V2O5/BiVO4 could effectively reduce its charge recombination process. {\textcopyright} 2024 The Authors",
keywords = "Characterisation, Electron-hole pairs, Heterojunction photoanode, PEC water splitting, Photocatalysis, Decay (organic), Heterojunctions, Transient absorption spectroscopy, Vanadium compounds, Characterization, Dynamic pathways, Electron hole pairs, Photo-anodes, Photoelectrochemical water splitting, Photogenerated charge carriers, Transfer pathway, Transient absorption spectroscopies, Type II heterojunction, Rate constants",
author = "C.S. Yaw and C. G{\"u}nnemann and D.W. Bahnemann and M.N. Chong",
note = "Export Date: 24 October 2024 CODEN: JALCE",
year = "2025",
month = jan,
day = "5",
doi = "10.1016/j.jallcom.2024.177011",
language = "Английский",
volume = "1010",
journal = "Journal of Alloys and Compounds",
issn = "0925-8388",
publisher = "Elsevier",

}

RIS

TY - JOUR

T1 - Elucidating the dynamics and transfer pathways of photogenerated charge carriers in V2O5/BiVO4 heterojunction photoanodes: A transient absorption spectroscopy study

AU - Yaw, C.S.

AU - Günnemann, C.

AU - Bahnemann, D.W.

AU - Chong, M.N.

N1 - Export Date: 24 October 2024 CODEN: JALCE

PY - 2025/1/5

Y1 - 2025/1/5

N2 - Pairing of bismuth vanadate (BiVO4) with vanadium pentoxide (V2O5) forms a Type II heterojunction photoanode, which has been proven to be a high-performance photoanode architecture for efficient photoelectrochemical (PEC) water oxidation. To further support for advanced rational design and improvement of the heterojunction photoanode, it is quintessential to understand the mechanics and properties of photogenerated charge carriers formed. This study aims to probe the dynamics of photogenerated electron-hole pairs formed in pristine photoanode as well as the heterojunction photoanodes using transient absorption spectroscopy (TAS). Relative to the BiVO4/V2O5 structure, modelling and quantification of the decay constant helps in explaining why the V2O5/BiVO4 heterojunction photoanode exhibited a longer lifetime of the photogenerated charge carriers with a lower decay rate constant that leads to a much-improved overall generation of photocurrent density. An oxygen evolving catalyst of nickel oxyhydroxide (NiOOH) was then anchored on the exterior surfaces of the heterojunction photoanode system to further investigate and modify the transfer pathways of the photogenerated charge carriers. Furthermore, the hole- and scavenger-assisted TAS measurements on the BiVO4/V2O5 heterojunction photoanode revealed that the majority of trapped holes species are accumulated within the BiVO4 layer. The findings suggested that the Type II heterojunction formation in V2O5/BiVO4 could effectively reduce its charge recombination process. © 2024 The Authors

AB - Pairing of bismuth vanadate (BiVO4) with vanadium pentoxide (V2O5) forms a Type II heterojunction photoanode, which has been proven to be a high-performance photoanode architecture for efficient photoelectrochemical (PEC) water oxidation. To further support for advanced rational design and improvement of the heterojunction photoanode, it is quintessential to understand the mechanics and properties of photogenerated charge carriers formed. This study aims to probe the dynamics of photogenerated electron-hole pairs formed in pristine photoanode as well as the heterojunction photoanodes using transient absorption spectroscopy (TAS). Relative to the BiVO4/V2O5 structure, modelling and quantification of the decay constant helps in explaining why the V2O5/BiVO4 heterojunction photoanode exhibited a longer lifetime of the photogenerated charge carriers with a lower decay rate constant that leads to a much-improved overall generation of photocurrent density. An oxygen evolving catalyst of nickel oxyhydroxide (NiOOH) was then anchored on the exterior surfaces of the heterojunction photoanode system to further investigate and modify the transfer pathways of the photogenerated charge carriers. Furthermore, the hole- and scavenger-assisted TAS measurements on the BiVO4/V2O5 heterojunction photoanode revealed that the majority of trapped holes species are accumulated within the BiVO4 layer. The findings suggested that the Type II heterojunction formation in V2O5/BiVO4 could effectively reduce its charge recombination process. © 2024 The Authors

KW - Characterisation

KW - Electron-hole pairs

KW - Heterojunction photoanode

KW - PEC water splitting

KW - Photocatalysis

KW - Decay (organic)

KW - Heterojunctions

KW - Transient absorption spectroscopy

KW - Vanadium compounds

KW - Characterization

KW - Dynamic pathways

KW - Electron hole pairs

KW - Photo-anodes

KW - Photoelectrochemical water splitting

KW - Photogenerated charge carriers

KW - Transfer pathway

KW - Transient absorption spectroscopies

KW - Type II heterojunction

KW - Rate constants

UR - https://www.mendeley.com/catalogue/16ab534d-1823-3cef-aa22-5ed7183043c8/

U2 - 10.1016/j.jallcom.2024.177011

DO - 10.1016/j.jallcom.2024.177011

M3 - статья

VL - 1010

JO - Journal of Alloys and Compounds

JF - Journal of Alloys and Compounds

SN - 0925-8388

M1 - 177011

ER -

ID: 126349934