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Hydrothermal Surface Engineering of Anodic WO3 Photoelectrode by Simultaneous Iron Doping and Fe3O4/FeWO4 Formation

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Title: Hydrothermal Surface Engineering of Anodic WO3 Photoelectrode by Simultaneous Iron Doping and Fe3O4/FeWO4 Formation
Authors: Piyali Chatterjee, Daniel Piecha, Sebastian Kotarba, Karolina Syrek, Marcin Pisarek, Grzegorz D. Sulka
Source: ACS Appl Mater Interfaces
Publisher Information: American Chemical Society (ACS), 2025.
Publication Year: 2025
Subject Terms: hydrothermal, anodic oxidation, photoanode, photoelectrochemical, water splitting, tungsten oxide, Research Article
Description: This study reports a hydrothermal surface modification approach to porous anodized WO3 to enhance its photoelectrochemical water oxidation performance. This results in the Fe doping of monoclinic WO3 and the simultaneous formation of Fe-containing phases, such as FeWO4 and Fe3O4. The photocurrent generated at the surface-engineered electrodes was double that of pure WO3 with long-term stability. The enhancement is attributable to the creation of oxygen vacancies due to Fe doping and the formation of the heterojunction between WO3 and FeWO4, a p-type semiconductor, which likely improved the charge carrier lifetime and charge transfer properties. Incident photon to current efficiency (IPCE) measurements revealed enhanced visible light performance, supported by the observed red shift in the light absorption edge. This work is one of the few explorations of WO3 photoanodes with an opaque metal substrate that involves fabrication of a light-facing overlayer at the surface. Characterization of the fabricated electrodes was carried out using X-ray diffraction (XRD), scanning electron microscopy (FESEM), energy dispersive X-ray spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS), Raman spectroscopy, and diffuse reflectance spectroscopy (UV-Vis DRS). Photoelectrochemical studies were conducted using linear voltammetry, amperometry, and electrochemical impedance spectroscopy (Nyquist, Bode, and Mott-Schottky plots).
Document Type: Article
Other literature type
Language: English
ISSN: 1944-8252
1944-8244
DOI: 10.1021/acsami.5c03437
Access URL: https://pubmed.ncbi.nlm.nih.gov/40340342
https://pubs.acs.org/doi/10.1021/acsami.5c03437
https://ruj.uj.edu.pl/handle/item/552936
Rights: CC BY
URL: http://creativecommons.org/licenses/by/4.0/This article is licensed under CC-BY 4.0
Accession Number: edsair.doi.dedup.....e96d87867e1452e80f515390745ebba1
Database: OpenAIRE
Description
Abstract:This study reports a hydrothermal surface modification approach to porous anodized WO3 to enhance its photoelectrochemical water oxidation performance. This results in the Fe doping of monoclinic WO3 and the simultaneous formation of Fe-containing phases, such as FeWO4 and Fe3O4. The photocurrent generated at the surface-engineered electrodes was double that of pure WO3 with long-term stability. The enhancement is attributable to the creation of oxygen vacancies due to Fe doping and the formation of the heterojunction between WO3 and FeWO4, a p-type semiconductor, which likely improved the charge carrier lifetime and charge transfer properties. Incident photon to current efficiency (IPCE) measurements revealed enhanced visible light performance, supported by the observed red shift in the light absorption edge. This work is one of the few explorations of WO3 photoanodes with an opaque metal substrate that involves fabrication of a light-facing overlayer at the surface. Characterization of the fabricated electrodes was carried out using X-ray diffraction (XRD), scanning electron microscopy (FESEM), energy dispersive X-ray spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS), Raman spectroscopy, and diffuse reflectance spectroscopy (UV-Vis DRS). Photoelectrochemical studies were conducted using linear voltammetry, amperometry, and electrochemical impedance spectroscopy (Nyquist, Bode, and Mott-Schottky plots).
ISSN:19448252
19448244
DOI:10.1021/acsami.5c03437