AI Article Synopsis
- BaTiO (BTO) is a promising photocatalyst but is limited to ultraviolet light absorption; doping it with iridium (Ir) allows for visible light absorption.
- The study shows that changing the valence state of Ir enhances hydrogen generation efficiency significantly, indicating important changes in the material's optoelectronic and structural properties.
- Findings suggest that the Ir:BTO combination could improve photocatalytic performance for solar hydrogen production, making it a valuable candidate for future sustainable energy applications.
Article Abstract
Despite having favorable energetics and tunable optoelectronic properties, utilization of BaTiO (BTO) for photocatalytic reactions is limited by its absorption only in the ultraviolet region. To address this challenge, BTO is doped with iridium (Ir) to induce visible light absorption. The visible light-induced photocatalytic H generation efficiency is enhanced by 2 orders of magnitude on selective conversion of the Ir valence state from Ir to Ir. To understand such intriguing behavior, valence state-dependent changes in the optoelectronic, structural, and surface properties and electronic band structure are comprehensively investigated. The effect of electron occupancy change between Ir (t e) and Ir (t e) and their energetic positions within the band gap is found to significantly influence H generation. Besides this, converting Ir to Ir enhanced the photocathodic current and lowered the onset potential. Results aid in designing photocatalysts to efficiently use low-energy photons for enhancing solar H production in these emerging BTO-based photocatalysts. Collectively, the observations made in this work highlight the promising application of Ir:BTO in z-scheme photocatalysis.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC10895576 | PMC |
| http://dx.doi.org/10.1021/acsami.3c16710 | DOI Listing |
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