Photoelectrochemical Nanostructures for Energy and Environmental Applications

Photoelectrochemical nanostructures harness nanoscale architectures and semiconductor junctions to convert solar energy into chemical fuels and to drive environmental remediation processes. By engineering materials such as titanium dioxide nanotubes, chalcogenide–oxide heterostructures and plasmonic metal–semiconductor composites, researchers have achieved enhanced light absorption across ultraviolet and visible regions, more efficient charge separation and extended operational stability. In energy applications, these nanostructured photoelectrodes facilitate solar-driven water splitting, generating hydrogen fuel through oxidation at a photoanode and reduction at a cathode under mild conditions. Environmental uses include degradation of organic pollutants and decontamination of water, achieved via photogenerated reactive species at the semiconductor surface. Key design strategies involve tailoring bandgap energies to absorb broader portions of the solar spectrum, constructing p–n and Z-scheme heterojunctions for directional charge flow, and incorporating plasmonic nanoparticles or photosensitisers to boost visible-light harvesting. Advances in fabrication—such as anodisation, hydrothermal synthesis and successive ionic layer adsorption—enable precise control over morphology, surface chemistry and interfacial energetics. Taken together, these developments underscore the global significance of photoelectrochemical nanostructures as scalable, low-carbon solutions to energy and environmental challenges.

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Photoelectrochemical Nanostructures for Energy and Environmental Applications publication trend

The graph below shows the total number of articles in photoelectrochemical nanostructures for energy and environmental applications across all publications each year (not limited to Nature Index journals).

Technical terms

Photoelectrochemical water splitting: Process by which a semiconductor electrode absorbs light to drive the electrolysis of water into hydrogen and oxygen.

Heterojunction: Interface between two semiconductors with different band structures, engineered to direct and separate photogenerated charge carriers.

Localised surface plasmon resonance (LSPR): Resonant oscillation of electrons in metal nanoparticles under illumination, enhancing electromagnetic fields and light absorption.

Z-scheme mechanism: Two-step charge transfer architecture that mimics natural photosynthesis, combining separate semiconductors to achieve higher redox potentials and efficient electron–hole separation.

Photoanode: Light-absorbing electrode at which oxidation reactions occur in a photoelectrochemical cell, typically responsible for oxygen evolution from water.

References

1. Optimizing the performance of Au y /Ni x /TiO 2 NTs photoanodes for photoelectrochemical water splitting. RSC Advances (2023).
2. Degradation of Organic Dye Congo Red by Heterogeneous Solar Photocatalysis with Bi2S3, Bi2S3/TiO2, and Bi2S3/ZnO Thin Films. Catalysts (2024).
3. Crystal Design and Photoactivity of TiO2 Nanorod Template Decorated with Nanostructured Bi2S3 Visible Light Sensitizer. International Journal of Molecular Sciences (2022).