ZnO/BiOI heterojunction photoanodes with enhanced photoelectrochemical water oxidation activity

Mingyue Wang; Andreas Kafizas; Sanjayan Sathasivam; Matthew  Blunt; Benjamin  Moss; Soranyel Gonzalez-Carrero; Claire Carmalt

doi:10.1016/j.apcatb.2023.122657

ZnO/BiOI heterojunction photoanodes with enhanced photoelectrochemical water oxidation activity

Mingyue Wang, Andreas Kafizas, Sanjayan Sathasivam, Matthew Blunt, Benjamin Moss, Soranyel Gonzalez-Carrero, Claire Carmalt

Chemical and Energy Engineering

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

35 Citations (Scopus)

Abstract

ZnO/BiOI heterojunction photoanode thin films were prepared by aerosol-assisted chemical vapour deposition, and the impact of growth temperature and film thickness on the water oxidation functionality was systematically investigated. A top ZnO layer with a thickness of 120 nm (deposited at 350 °C) and a 390 nm thick BiOI layer (deposited at 300 °C) were found to achieve the best photoelectrochemical performance of the heterojunction. The ZnO/BiOI heterojunction exhibited a significant increase in photoelectrochemical activity, with a photocurrent of 0.27 mA·cm−2 observed at 1.1 VRHE (350 nm, 2.58 mW·cm−2), which is ~ 2.2 times higher than that of single-layer ZnO and far higher than that of BiOI. Photoluminescence spectroscopy and transient absorption spectroscopy measurements showed that there was effective charge transfer across the heterojunction which spatially separated charge carriers and increased their lifetime and ability to drive photoelectrochemical water oxidation.

Original language	English
Article number	122657
Journal	Applied Catalysis B: Environmental
Volume	331
DOIs	https://doi.org/10.1016/j.apcatb.2023.122657
Publication status	Published - 21 Mar 2023

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10.1016/j.apcatb.2023.122657

1-s2.0-S0926337323003004-mainFinal published version, 6.88 MBLicence: CC BY 4.0

Cite this

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title = "ZnO/BiOI heterojunction photoanodes with enhanced photoelectrochemical water oxidation activity",

abstract = "ZnO/BiOI heterojunction photoanode thin films were prepared by aerosol-assisted chemical vapour deposition, and the impact of growth temperature and film thickness on the water oxidation functionality was systematically investigated. A top ZnO layer with a thickness of 120 nm (deposited at 350 °C) and a 390 nm thick BiOI layer (deposited at 300 °C) were found to achieve the best photoelectrochemical performance of the heterojunction. The ZnO/BiOI heterojunction exhibited a significant increase in photoelectrochemical activity, with a photocurrent of 0.27 mA·cm−2 observed at 1.1 VRHE (350 nm, 2.58 mW·cm−2), which is ~ 2.2 times higher than that of single-layer ZnO and far higher than that of BiOI. Photoluminescence spectroscopy and transient absorption spectroscopy measurements showed that there was effective charge transfer across the heterojunction which spatially separated charge carriers and increased their lifetime and ability to drive photoelectrochemical water oxidation.",

author = "Mingyue Wang and Andreas Kafizas and Sanjayan Sathasivam and Matthew Blunt and Benjamin Moss and Soranyel Gonzalez-Carrero and Claire Carmalt",

year = "2023",

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doi = "10.1016/j.apcatb.2023.122657",

language = "English",

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TY - JOUR

T1 - ZnO/BiOI heterojunction photoanodes with enhanced photoelectrochemical water oxidation activity

AU - Wang, Mingyue

AU - Kafizas, Andreas

AU - Sathasivam, Sanjayan

AU - Blunt, Matthew

AU - Moss, Benjamin

AU - Gonzalez-Carrero, Soranyel

AU - Carmalt, Claire

PY - 2023/3/21

Y1 - 2023/3/21

N2 - ZnO/BiOI heterojunction photoanode thin films were prepared by aerosol-assisted chemical vapour deposition, and the impact of growth temperature and film thickness on the water oxidation functionality was systematically investigated. A top ZnO layer with a thickness of 120 nm (deposited at 350 °C) and a 390 nm thick BiOI layer (deposited at 300 °C) were found to achieve the best photoelectrochemical performance of the heterojunction. The ZnO/BiOI heterojunction exhibited a significant increase in photoelectrochemical activity, with a photocurrent of 0.27 mA·cm−2 observed at 1.1 VRHE (350 nm, 2.58 mW·cm−2), which is ~ 2.2 times higher than that of single-layer ZnO and far higher than that of BiOI. Photoluminescence spectroscopy and transient absorption spectroscopy measurements showed that there was effective charge transfer across the heterojunction which spatially separated charge carriers and increased their lifetime and ability to drive photoelectrochemical water oxidation.

AB - ZnO/BiOI heterojunction photoanode thin films were prepared by aerosol-assisted chemical vapour deposition, and the impact of growth temperature and film thickness on the water oxidation functionality was systematically investigated. A top ZnO layer with a thickness of 120 nm (deposited at 350 °C) and a 390 nm thick BiOI layer (deposited at 300 °C) were found to achieve the best photoelectrochemical performance of the heterojunction. The ZnO/BiOI heterojunction exhibited a significant increase in photoelectrochemical activity, with a photocurrent of 0.27 mA·cm−2 observed at 1.1 VRHE (350 nm, 2.58 mW·cm−2), which is ~ 2.2 times higher than that of single-layer ZnO and far higher than that of BiOI. Photoluminescence spectroscopy and transient absorption spectroscopy measurements showed that there was effective charge transfer across the heterojunction which spatially separated charge carriers and increased their lifetime and ability to drive photoelectrochemical water oxidation.

U2 - 10.1016/j.apcatb.2023.122657

DO - 10.1016/j.apcatb.2023.122657

M3 - Article

SN - 0926-3373

VL - 331

JO - Applied Catalysis B: Environmental

JF - Applied Catalysis B: Environmental

M1 - 122657

ER -