Photocatalytic Hydrogen Production Technologies
Summary
Photocatalytic hydrogen production harnesses semiconductor materials to split water or reform organic substrates under illumination, offering a route to clean, renewable hydrogen fuel. Titanium dioxide remains the archetypal photocatalyst due to its stability and cost-effectiveness, yet its wide band gap limits absorption to the ultraviolet region. Advances in band-gap engineering—through metal or non-metal doping, heterojunction formation and plasmonic enhancement—have extended activity into the visible spectrum. Co-catalysts such as platinum, palladium and gold nanoparticles promote charge separation and surface reactions, while reactor design and light-management strategies optimise photon utilisation and mass-transport effects. The field has witnessed progress in understanding reaction networks, interfacial charge dynamics and scalable photoreactor technologies, paving the way for practical implementation in decentralised energy systems and integrated waste-to-fuel processes.
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Photocatalytic Hydrogen Production Technologies publication trend
The graph below shows the total number of articles in photocatalytic hydrogen production technologies across all publications each year (not limited to Nature Index journals).
Technical terms
Photocatalysis: A light-driven process in which a semiconductor catalyst absorbs photons to generate charge carriers that drive chemical reactions.
Quantum yield: The ratio of molecules of hydrogen produced to photons absorbed by the photocatalyst.
Schottky junction: An interface between a metal and a semiconductor that facilitates charge separation and suppresses recombination.
Organic scavenger: A sacrificial molecule that consumes photogenerated holes, thereby enhancing electron availability for hydrogen evolution.
Band gap: The energy difference between the valence and conduction bands of a semiconductor, determining the wavelength of light it can absorb.
References
- A compact photoreactor for automated H2 photoproduction: Revisiting the (Pd, Pt, Au)/TiO2 (P25) Schottky junctions. Chemical Engineering Journal (2023).
- Isophotonic reactor for the precise determination of quantum yields in gas, liquid, and multi-phase photoreactions. Chemical Engineering Journal (2023).
- Green Thermo-Photo Catalytic Production of Syngas Using Pd/Nb–TiO2 Catalysts. ACS Sustainable Chemistry & Engineering (2023).
- Solar hydrogen production from ethanol-water vapours over metal/TiO2 photocatalysts supported on β-SiC alveolar foams. Catalysis Today (2023).
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