Photoelectrochemical Hydrogen Production with Nanostructured Semiconductors

Photoelectrochemical water splitting harnesses sunlight to drive the separation of water into hydrogen and oxygen, offering a route to sustainable fuel generation with minimal environmental impact. Nanostructured semiconductors play a central role as photoelectrodes, where their high surface area, tuned bandgaps and tailored interfaces improve light harvesting, charge separation and catalytic reactions. Advances in morphology control—such as one-dimensional nanorods, core–shell architectures and three-dimensional branched arrays—have enhanced photon absorption and shortened carrier transport pathways. Concurrent progress in band alignment, interfacial engineering and co-catalyst integration has reduced charge recombination and lowered overpotentials for hydrogen evolution. The global significance of these developments lies in the potential to scale photoelectrochemical systems for decentralised hydrogen production, integrating with renewable electricity to form carbon-neutral energy cycles. Practical applications span from domestic fuel cells to industrial feedstock, underpinned by robust, earth-abundant materials. Ongoing challenges include improving long-term stability in aqueous environments and maximising solar-to-hydrogen conversion efficiencies under real-world conditions.

Research from Nature Portfolio

Interface-induced growth of an intermediate solid-solution layer within CdS/ZnS core–shell nanorods has demonstrated a breakthrough in bandgap engineering. By forming a uniform lamellar CdS–Zn₁₋ₓCdₓS–ZnS interlayer, the photocurrent density of the nanorod array rose to 14.0 mA cm⁻² at zero bias, nearly eight times higher than pure CdS counterparts. Incident-photon-to-current conversion efficiencies exceeded 50 % under simulated sunlight, while photocatalytic stability extended beyond 6 000 s. The intermediate layer provides a scalable, crystalline charge-transfer channel, enhancing both carrier separation and durability—key metrics for large-area photoanodes in practical water-splitting devices.

Photoelectrochemical Hydrogen Production with Nanostructured Semiconductors publication trend

The graph below shows the total number of articles in photoelectrochemical hydrogen production with nanostructured semiconductors across all publications each year (not limited to Nature Index journals).

Technical terms

Photoelectrochemical water splitting: Light-driven electrochemical process that dissociates water into hydrogen and oxygen at semiconductor electrodes.

Nanorod arrays: Vertically aligned one-dimensional nanostructures that increase surface area and shorten charge-transport distances.

Heterostructure: Junction of two or more semiconductors with distinct bandgaps designed to facilitate charge separation and transfer.

Band alignment: Relative energies of conduction and valence bands at an interface, determining carrier flow and reaction selectivity.

Incident photon-to-current conversion efficiency (IPCE): Ratio of collected charge carriers to incident photons at a given wavelength, indicating spectral response.

References

1. Interface induce growth of intermediate layer for bandgap engineering insights into photoelectrochemical water splitting. Scientific Reports (2016).
2. Regulating the Charge Migration in CuInSe2/N‐Doped Carbon Nanorod Arrays via Interfacial Engineering for Boosting Photoelectrochemical Water Splitting. Advanced Science (2023).
3. Controlling the thiourea for optimized growth of CdS nanorod arrays for improved photoelectrochemical water splitting. Journal of Crystal Growth (2024).
4. Controlled growth of 3D CdS-branched ZnO nanorod arrays for efficient solar driven photoelectrochemical water splitting. Solid State Sciences (2024).