Proceedings of Materials for Sustainable Development Conference (MAT-SUS) (NFM22)
DOI: https://doi.org/10.29363/nanoge.nfm.2022.170
Publication date: 11th July 2022
Halide perovskites are well known for their good light absorption properties, tuneable electronic band structures, and good charge carrier mobility. Cs3Bi2Br9 is a lead-free ternary halide perovskite with the ability to absorb light in the UV and visible ranges with a band structure that allows it to be used for photocatalytic CO2 reduction. However, the low surface area, poor CO2 adsorption, and high charge recombination of Cs3Bi2Br9 prevents it from obtaining high production rates of solar fuels. Therefore, the purpose of this work is to design a novel heterojunction between templated g-C3N4 and Cs3Bi2Br9 with Pt nanoparticles as a co-catalyst. SiO2 nanospheres with a diameter of 250 nm were synthesised and used as a template to form homogeneous and well-ordered g-C3N4 inverse opal structures. Templated g-C3N4 were successfully obtained and proven to show a 52% increase in BET surface area with an improvement in CO2 adsorption compared to bulk g-C3N4. Gas-phase photocatalytic reactions were performed and a selectivity shift towards CO production was observed with an increase from 2.23 to 6.28 µmol CO g-1 h-1 using templated g-C3N4. The incorporation of 1 wt% Pt nanoparticles induced the evolution of 71.83 µmol H2 g-1 h-1 in addition to 7.21 µmol CO g-1 h-1 and 1.57 µmol CH4 g-1 h-1. A preliminary assessment of the effectiveness of Cs3Bi2Br9 perovskite showed a production of 5.5 µmol CO g-1 h-1 as well as a good electronic band structure alignment with g-C3N4. Current stages of this project entail optimising the band structure alignment of the two materials to synthesise a heterojunction that further boosts solar fuels production as well as exploring the effects of different cocatalysts on the efficiency of the process.
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