OER Activity Promoted by Organic Ligand-Free Cs2Pt(Cl, Br)6 Perovskite Photocatalyst for Solar-Driven Water Splitting
[EN] The development of lead-free perovskites as environmentally sustainable materials has gained significant attention for their applications in solar cells and photocatalysis. In this study, Cs2PtCl6 and Cs2PtBr6 vacancy-ordered double perovskites are synthesized via a hydrothermal method and eval...
| Autores: | , , , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2025 |
| País: | España |
| Institución: | Universitat Politècnica de València (UPV) |
| Repositorio: | RiuNet. Repositorio Institucional de la Universitat Politécnica de Valéncia |
| Idioma: | inglés |
| OAI Identifier: | oai:riunet.upv.es:10251/230562 |
| Acceso en línea: | https://riunet.upv.es/handle/10251/230562 |
| Access Level: | acceso abierto |
| Palabra clave: | Lead-free perovskites Oxygen evolution reaction Photocatalysis Platinum Water splitting |
| Sumario: | [EN] The development of lead-free perovskites as environmentally sustainable materials has gained significant attention for their applications in solar cells and photocatalysis. In this study, Cs2PtCl6 and Cs2PtBr6 vacancy-ordered double perovskites are synthesized via a hydrothermal method and evaluated as ligand-free photocatalysts for solar-driven water splitting, targeting the oxygen evolution reaction (OER). Structural characterization confirms their cubic phase, and ultraviolet-visible diffuse reflectance spectroscopy reveals optical bandgaps of 2.17 eV for Cs2PtCl6 and 1.94 eV for Cs2PtBr6. Theoretical calculations based on density of states analysis confirms their semiconductor behavior. Photocatalytic studies show that Cs2PtBr6 exhibits superior O-2 evolution rates (368.9 mu mol g(-1) h(-1)) compared to Cs2PtCl6 (237.4 mu mol g(-1) h(-1)), attributed to its favorable electronic structure. Also, photoluminescence (PL) studies reveals that Cs2PtBr6 exhibits lower PL intensity and a longer emission lifetime (2.5 mu s) compared to Cs2PtCl6 (1.3 mu s). Long-term stability tests highlight moderate photostability, with Pt4+ reduction due to precipitation of Pt-0 under prolonged irradiation or reuses. This research highlights the potential of Cs2PtX6 perovskites for efficient, sustainable OER catalysis while identifying challenges related to structural stability and charge recombination. |
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