Abstract
In this study, we report the development of a BiVO4/ZnFe2O4 heterostructure and its characterization as a photoanode in solar water splitting. ZnFe2O4 was deposited on a BiVO4 thin film after electrodepositing varying charges of FeOOH (50, 100, and 250 mC), which were then thermally oxidized in the presence of air and a zinc source. Structural characterization via XRD and profilometry indicated an increase in film thickness with higher deposited charges. The analysis revealed a decrease in strain and Urbach energy, indicative of reduced structural defects and an increase in the bandgap. SEM images illustrated the porous nature of the film surfaces, with elongated 2D structures enhancing light absorption through multiple reflectance effects. However, increased charge deposition led to particle agglomeration, reducing light absorption efficiency and active surface area, thus diminishing photogenerated charge generation. Electrochemical and photoelectrochemical characterization confirmed the n-type nature of all films, with carrier concentration increasing with film thickness. Nevertheless, the thinnest film (50 mC) exhibited the highest photocurrent, attributed to reduced particle agglomeration, enhanced light absorption, greater charge transport capacity, and superior electrocatalytic behavior, thereby minimizing recombination effects. Overall, the heterostructure demonstrated suitability as a photoanode for oxygen evolution reaction, supported by correct band alignment as determined from flat band potentials.
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The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.
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Acknowledgements
The authors thank CONAHCYT-México for providing postdoctoral fellowships to carry out the present work (Odín Reyes). The authors also thank Dr. Patricia Altuzar Coello and MS María Luisa Ramón García for XRD analysis, and Rogelio Morán Elvira for SEM images. Thanks to QFB Nayeli del Carmen López Vázquez for her assistance in the Faculty of Chemical Sciences of the Autonomous University of Chiapas laboratories.
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Odín Reyes Vallejo (CVU 487411) acknowledges CONAHCYT for the postdoctoral fellowships.
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Rocío Magdalena Sánchez-Albores: Conceptualization, investigation, experiments, methodology, writing the original draft, and corrections. Odin Reyes-Vallejo: Conceptualization, investigation, experiments, characterization, methodology, writing the original draft, and corrections. Francisco Pola-Albores: Reviewing and editing. Arturo Fernández-Madrigal: Reagents/materials/analysis tools, and reviewing. Andrés López-López: Characterization and reviewing. Edna Iris Ríos-Valdovinos: Reviewing and editing.
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Sánchez-Albores, R.M., Reyes-Vallejo, O., Pola-Albores, F. et al. Development of the BiVO4/ZnFe2O4 heterostructure for solar water splitting. J Mater Sci: Mater Electron 35, 1538 (2024). https://doi.org/10.1007/s10854-024-13315-8
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DOI: https://doi.org/10.1007/s10854-024-13315-8