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.Research output: Contribution to journal › Article › peer-review
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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