Photocatalytic Materials for Solar Energy Applications

Photocatalytic materials convert sunlight into chemical energy by generating electron–hole pairs upon light absorption and using these charge carriers to power redox reactions. Central to this field are semiconductor oxides, chalcogenides and emerging perovskite structures, each engineered to optimise light harvesting, charge separation and surface reactivity. Strategies such as elemental doping, heterojunction formation and nanostructuring have yielded significant gains in visible‐light responsiveness and catalytic efficiency. Recent efforts focus on tailoring band gaps to extend absorption into the visible spectrum, introducing internal electric fields to suppress recombination and creating high‐surface‐area morphologies to maximise active sites. These advances underpin solar‐driven water splitting for hydrogen production, carbon dioxide reduction and pollutant degradation, addressing both renewable energy generation and environmental remediation. Integration of computational design with advanced synthesis and in situ characterisation continues to propel the discovery of robust, earth‐abundant photocatalysts suitable for large‐scale deployment.

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Photocatalytic Materials for Solar Energy Applications publication trend

The graph below shows the total number of articles in photocatalytic materials for solar energy applications across all publications each year (not limited to Nature Index journals).

Technical terms

Photocatalysis: A process in which a material absorbs photons to generate reactive charge carriers that drive chemical reactions.

Band gap: The energy difference between a semiconductor’s valence band and conduction band, determining the wavelength of light it can absorb.

Electron–hole recombination: The undesirable recombination of photogenerated electrons and holes, which reduces photocatalytic efficiency.

Oxygen vacancy: A type of point defect in oxide materials where an oxygen ion is missing, often enhancing charge carrier separation and surface reactivity.

Defect pyrochlore: A crystalline framework with the general formula A₂B₂O₇ or variants thereof, where controlled cation vacancies or substitutions tailor photocatalytic properties.

References

1. Effect of the synthesis method on the MnCo2O4 towards the photocatalytic production of H2. REVIEWS ON ADVANCED MATERIALS SCIENCE (2022).
2. Effect of Fe dopant on oxygen vacancy variation and enhanced photocatalysis hydrogen production of LaMnO3 perovskite nanofibers. Materials Science in Semiconductor Processing (2023).
3. The Elemental Multifariousness of the Defect‐Pyrochlore Crystal Structure and Application in Photocatalytic Hydrogen Generation. Energy Technology (2021).