Engineering the Interfacial Contact between Bi2WO6 and WO3 Heterojunction Photoanode for Improved Charge Transportation

Hoi Ying Chung; Roong Jien Wong; Rose Amal; Yun Hau Ng

doi:10.1021/acs.energyfuels.2c01346

Engineering the Interfacial Contact between Bi₂WO₆ and WO₃ Heterojunction Photoanode for Improved Charge Transportation

Hoi Ying Chung, Roong Jien Wong, Rose Amal, Yun Hau Ng^*

^*Corresponding author for this work

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

13 Citations (Scopus)

Abstract

Bi₂WO₆/WO₃ heterojunction thin films with low or high interfacial contact between the Bi₂WO₆ and WO₃ photo-catalyst were employed as the photoanode for photoelectrochem-ical (PEC) reactions. By modulation of the transformation of WO₃ to Bi₂WO₆ via a combined electrodeposition and hydrothermal reaction, a controlled degree of interfacial contact between Bi₂WO₆ and WO₃ was achieved. An increase in the anodic photocurrent was observed from the PEC measurement, which was further supported by the conductive atomic force microscopy analysis under a low applied bias when the higher Bi₂WO₆/WO₃ interfacial contact photoelectrode was examined. Experiment results suggested that the improvement was ascribed to a lower density of surface trap of the photoelectrons that reduced the charge recombination rate within the bulk photocatalyst.

Original language	English
Pages (from-to)	11550–11558
Journal	Energy & Fuels
Volume	36
Issue number	19
Online published	28 Jul 2022
DOIs	https://doi.org/10.1021/acs.energyfuels.2c01346
Publication status	Published - 6 Oct 2022

Funding

This work was supported by the Australian Research Council under the Laureate Fellowship Scheme (FL140100081), the Hong Kong Research Grants Council (RGC) under General Research Fund (GRF CityU 11305419, CityU 11306920 and CityU 11308721), and the General Program of Science and Technology Innovation Committee of Shenzhen Municipality (Grant JCYJ20190808181805621). The authors acknowledge the facilities and the scientific and technical assistance of the Electron Microscope Unit, University of New South Wales.

Research Keywords

P-N HETEROJUNCTION
PHOTOELECTROCHEMICAL PERFORMANCE
WATER OXIDATION
FILMS

RGC Funding Information

RGC-funded

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1021/acs.energyfuels.2c01346

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title = "Engineering the Interfacial Contact between Bi2WO6 and WO3 Heterojunction Photoanode for Improved Charge Transportation",

abstract = "Bi2WO6/WO3 heterojunction thin films with low or high interfacial contact between the Bi2WO6 and WO3 photo-catalyst were employed as the photoanode for photoelectrochem-ical (PEC) reactions. By modulation of the transformation of WO3 to Bi2WO6 via a combined electrodeposition and hydrothermal reaction, a controlled degree of interfacial contact between Bi2WO6 and WO3 was achieved. An increase in the anodic photocurrent was observed from the PEC measurement, which was further supported by the conductive atomic force microscopy analysis under a low applied bias when the higher Bi2WO6/WO3 interfacial contact photoelectrode was examined. Experiment results suggested that the improvement was ascribed to a lower density of surface trap of the photoelectrons that reduced the charge recombination rate within the bulk photocatalyst.",

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author = "Chung, {Hoi Ying} and Wong, {Roong Jien} and Rose Amal and Ng, {Yun Hau}",

year = "2022",

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language = "English",

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AU - Chung, Hoi Ying

AU - Wong, Roong Jien

AU - Amal, Rose

AU - Ng, Yun Hau

PY - 2022/10/6

Y1 - 2022/10/6

N2 - Bi2WO6/WO3 heterojunction thin films with low or high interfacial contact between the Bi2WO6 and WO3 photo-catalyst were employed as the photoanode for photoelectrochem-ical (PEC) reactions. By modulation of the transformation of WO3 to Bi2WO6 via a combined electrodeposition and hydrothermal reaction, a controlled degree of interfacial contact between Bi2WO6 and WO3 was achieved. An increase in the anodic photocurrent was observed from the PEC measurement, which was further supported by the conductive atomic force microscopy analysis under a low applied bias when the higher Bi2WO6/WO3 interfacial contact photoelectrode was examined. Experiment results suggested that the improvement was ascribed to a lower density of surface trap of the photoelectrons that reduced the charge recombination rate within the bulk photocatalyst.

AB - Bi2WO6/WO3 heterojunction thin films with low or high interfacial contact between the Bi2WO6 and WO3 photo-catalyst were employed as the photoanode for photoelectrochem-ical (PEC) reactions. By modulation of the transformation of WO3 to Bi2WO6 via a combined electrodeposition and hydrothermal reaction, a controlled degree of interfacial contact between Bi2WO6 and WO3 was achieved. An increase in the anodic photocurrent was observed from the PEC measurement, which was further supported by the conductive atomic force microscopy analysis under a low applied bias when the higher Bi2WO6/WO3 interfacial contact photoelectrode was examined. Experiment results suggested that the improvement was ascribed to a lower density of surface trap of the photoelectrons that reduced the charge recombination rate within the bulk photocatalyst.

KW - P-N HETEROJUNCTION

KW - PHOTOELECTROCHEMICAL PERFORMANCE

KW - WATER OXIDATION

KW - FILMS

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JO - Energy & Fuels

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ER -

Engineering the Interfacial Contact between Bi₂WO₆ and WO₃ Heterojunction Photoanode for Improved Charge Transportation

Abstract

Funding

Research Keywords

RGC Funding Information

UN SDGs

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GRF: Understanding the Improved Photocharge Transportation in Bismuth-Based Photocatalysts via Defect and Structural Engineering

GRF: Development of Nanostructured Photoelectrodes for Solar Water Splitting via Advanced Electrochemical-based Synthesis Techniques

GRF: Development of High-Efficiency Non-Tio2 Based Oxide Photocatalysts by Understanding the Underlying Photocorrosion Phenomena

Cite this

Engineering the Interfacial Contact between Bi2WO6 and WO3 Heterojunction Photoanode for Improved Charge Transportation

Abstract

Funding

Research Keywords

RGC Funding Information

UN SDGs

Access Output

Other Access Options

Permanent Link

Other Files and Links

Fingerprint

Projects

GRF: Understanding the Improved Photocharge Transportation in Bismuth-Based Photocatalysts via Defect and Structural Engineering

GRF: Development of Nanostructured Photoelectrodes for Solar Water Splitting via Advanced Electrochemical-based Synthesis Techniques

GRF: Development of High-Efficiency Non-Tio2 Based Oxide Photocatalysts by Understanding the Underlying Photocorrosion Phenomena

Cite this

Engineering the Interfacial Contact between Bi₂WO₆ and WO₃ Heterojunction Photoanode for Improved Charge Transportation