Publication date: 17th July 2025
Bismuth-based semiconductors, including the double perovskite Cs₂AgBiBr₆ but also perovskite-inspired materials such as bismuth oxyhalides or sulphides, show great promise for sustainable light-energy conversion due to their low toxicity, abundance, and tunable electronic properties. This presentation will explore strategies to enhance the efficiency, stability, and scalability of these materials in photoelectrocatalytic applications. Methods like automated film production, surface modifications, and heterojunction formation have been employed to improve the performance of BiOI and BiOBr in water splitting and hydrogen evolution reactions. A continuous automated film production method for BiOI and BiVO4 photoelectrodes was introduced, significantly improving the reproducibility and efficiency of large-scale production. Surface modifications and heterojunction formation have been explored to optimize PEC performance, with enhanced water oxidation and hydrogen evolution reactions observed. Some recent hints on the use of hydrothermally synthesized, low bandgap and highly absorbing AgBiS2 in PEC water oxidation will be further provided. These advancements position bismuth-based semiconductors as viable, eco-friendly alternatives for energy conversion technologies.
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