Publication date: 28th August 2024
The climate crisis is one of the most pressing challenges of our time. Global and coordinated action to reduce greenhouse gas emissions and mitigate their impacts is indispensable. Proposed solutions to address this crisis include the adoption of renewable energy, increased energy efficiency, reforestation, and the use of innovative technologies. In the technology sector, photocatalysis is attracting growing interest, fueling intense research into new materials.1 In our study, we examined the photocatalytic activity of heterojunctions between Bi2WO6 and Cs3(Bi1-xSbx)2Br9. Bi2WO6 is a widely recognized graphitic material in the field of photocatalysis, while perovskites, known for their excellent tunability, prove to be outstanding co-catalysts.2,3 Lead-free inorganic perovskites have been the subject of numerous studies for years.4,5 Of particular interest is the introduction of different metals into the B-site, introducing a high entropy approach which is still in its infancy.6 In our study, we analyzed how the structural and optical properties change with increasing doping rates. The formation of a heterojunction between the two materials could create a more complex charge carrier transport pattern than with single materials, increasing their lifetime and thus improving photocatalytic results.7 The heterojunction is facilitated by the innovative in-situ synthesis adopted, in which perovskite is formed within a solvent in which Bi2WO6 has been dispersed. The aim of the project is the photocatalytic splitting of water and CO2, underlining the importance of property-structure relationships also in the photocatalytic field. The project aims to highlight the differences in various set-ups, whether liquid-liquid or gas-solid. The discovery of new materials and the acquisition of new knowledge about photocatalysts are key to the development of advanced technologies for CO2 reduction. Photocatalytic methane evolution paves the way for a circular ‘waste to fuel’ economy in which waste molecules such as CO2 regain value.
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