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Cobalt-doping and CoOx cocatalyst synergistically enhances BiVO4 photoelectrochemical water and methane oxidation.

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Title: Cobalt-doping and CoOx cocatalyst synergistically enhances BiVO4 photoelectrochemical water and methane oxidation.
Authors: Rodrigues, Alessandra P.1 (AUTHOR), Zapata, Maximiliano J.M.1 (AUTHOR) moreno.zapata@ufms.br, Ricardo, Carla P.2 (AUTHOR), Martins, Cauê A.1 (AUTHOR), Wender, Heberton1 (AUTHOR) heberton.wender@ufms.br
Source: Materials Letters. Aug2025, Vol. 392, pN.PAG-N.PAG. 1p.
Subjects: Oxidation of water, Solar energy conversion, Carrier density, Sustainability, Charge transfer, Photoelectrochemistry
Abstract: • Synergistic Co-doping and CoO x cocatalyst enhance BiVO 4 photoanode performance. • Dual modification preserves BiVO 4 ′s structural, optical, and morphological properties. • Photocurrent densities of 4.2 and 4.6 mA/cm2 achieved for water and CH 4 oxidation. This study presents a BiVO 4 (BVO) photoanode modified with cobalt doping and CoO x cocatalyst (Co 10 BVO/CoO x) to enhance photoelectrochemical (PEC) performance, particularly for methane oxidation. While BVO is well-studied for water oxidation, its application in methane conversion remains limited. The synergistic effect of Co-doping and CoO x significantly improves PEC performance, achieving photocurrent densities of 4.2 and 4.6 mA/cm2 at 1.23 V RHE for water and methane oxidation, respectively. Despite maintaining structural, optical, and morphological properties like pristine BVO, Co 10 BVO/CoO x exhibits reduced charge transfer resistance, increased carrier density, and a lower onset potential, enhancing PEC activity. These findings highlight the potential of this dual modification strategy for solar-driven methane valorization and sustainable fuel production. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
Description
Abstract:• Synergistic Co-doping and CoO x cocatalyst enhance BiVO 4 photoanode performance. • Dual modification preserves BiVO 4 ′s structural, optical, and morphological properties. • Photocurrent densities of 4.2 and 4.6 mA/cm2 achieved for water and CH 4 oxidation. This study presents a BiVO 4 (BVO) photoanode modified with cobalt doping and CoO x cocatalyst (Co 10 BVO/CoO x) to enhance photoelectrochemical (PEC) performance, particularly for methane oxidation. While BVO is well-studied for water oxidation, its application in methane conversion remains limited. The synergistic effect of Co-doping and CoO x significantly improves PEC performance, achieving photocurrent densities of 4.2 and 4.6 mA/cm2 at 1.23 V RHE for water and methane oxidation, respectively. Despite maintaining structural, optical, and morphological properties like pristine BVO, Co 10 BVO/CoO x exhibits reduced charge transfer resistance, increased carrier density, and a lower onset potential, enhancing PEC activity. These findings highlight the potential of this dual modification strategy for solar-driven methane valorization and sustainable fuel production. [ABSTRACT FROM AUTHOR]
ISSN:0167577X
DOI:10.1016/j.matlet.2025.138569