Publication date: 28th August 2024
Converting atmospheric CO2 into renewable fuels using sunlight is an attractive concept for addressing the energy crisis and reducing fossil fuel consumption. Most studies which integrate nanophotonics and catalysis are based on the principle of fabricating hybrid catalysts using plasmonic metal particles as co-catalysts for semiconductor nanostructures. However, nanophotonics can be leveraged in other ways to improve photocatalytic performance.
Meta-surfaces, which are arrays of nanostructures with subwavelength spacing, enable the development of materials with functions beyond the intrinsic properties of the materials. Although demonstrated primarily for imaging and sensing applications, they have the potential to improve energy conversion devices. For example, all-dielectric metasurfaces with low intrinsic losses can allow efficient focusing of light near catalyst sites and improve reaction yields without increasing incident energy, boosting performance significantly compared to thin film based devices. In addition, the spectral response of these devices can be tuned by developing the geometry of the unit cell and the spatial arrangement to make the meta-devices suitable for a wide range of photocatalysis reactions. In this project, we develop Mie resonant metasurface reactors towards enhanced photocatalytic fuel conversion that exhibits unprecedented optical modes and light trapping features.
We acknowledge funding from STI Engineering Discovery Initiative and SNSF Eccellenza Grant PCEGP2-194181.
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