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Enhancing Photoelectrochemical Water Oxidation Using Ferromagnetic Materials and Magnetic Fields. | LitMetric

Enhancing Photoelectrochemical Water Oxidation Using Ferromagnetic Materials and Magnetic Fields.

J Am Chem Soc

Institute of Photoelectronic Thin Film Devices and Technology, State Key Laboratory of Photovoltaic Materials and Cells, Tianjin Key Laboratory of Efficient Solar Energy Utilization, Ministry of Education Engineering Research Center of Thin Film Photoelectronic Technology, Nankai University, Tianjin 300350, China.

Published: December 2024

AI Article Synopsis

  • Photoelectrochemical (PEC) water splitting is an emerging method for hydrogen production, but its efficiency is hindered by issues like carrier recombination and slow water oxidation.
  • The study shows that adding a ferromagnetic coating (FeTiO) to a photoanode (BiVO) and using an external magnetic field enhances solar water oxidation performance by improving charge separation and catalytic efficiency.
  • The findings suggest that this magnetic field technique can be applied to other metal oxide photoanodes, indicating a new approach to boost PEC performance in nonmagnetic semiconductor materials.

Article Abstract

Photoelectrochemical (PEC) water splitting provides a promising strategy for H production. However, its performance is limited by severe carrier recombination and sluggish water oxidation kinetics. While numerous strategies, namely, elemental doping, morphology engineering, heterojunction formation, and catalyst modification, have been extensively explored to enhance the PEC performance, the application of external magnetic fields (MFs) to affect the catalysis or charge carrier dynamics remains yet to be exploited. Herein, BiVO is first selected as a representative photoanode, demonstrating that an ultrathin ferromagnetic coating based on FeTiO, when combined with an external MF, boosts its solar water oxidation performance. The combined analyses of the charge transfer and separation efficiency together with ultraviolet photoelectron spectroscopy and transient absorption spectroscopy data revealed that the MF positively affects the band alignment across the BiVO/FeTiO interface, improving the charge separation, while the oxygen evolution at the FeTiO/electrolyte interface was promoted. Finally, we expand this concept to other metal oxide photoanodes, such as TiO, WO, and FeO, demonstrating the universality of such an approach. Overall, this work pioneers a novel route to harvest external MFs and improve the PEC response of common nonmagnetic semiconductor photoelectrodes in photoelectrocatalytic conversion.

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Source
http://dx.doi.org/10.1021/jacs.4c13017DOI Listing

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