Photoelectrochemical Water Splitting with TiO2 Nanostructures

Titanium dioxide (TiO2) nanostructures have emerged as leading photoanode materials for solar-driven water splitting, converting sunlight into hydrogen and oxygen via a photoelectrochemical (PEC) process. Nanostructuring at the micro- to nanoscale—ranging from nanorods and nanowires to hierarchical nanotubes and porous films—amplifies the active surface area and shortens charge-carrier pathways, mitigating recombination losses. Tailoring crystal phase, doping, surface treatments and heterojunction interfaces further broadens the optical response into the visible region and accelerates charge separation. By engineering oxygen vacancies, introducing co-catalysts or incorporating plasmonic species, researchers have significantly enhanced light absorption, charge transport and catalytic activity for water oxidation and reduction. These advances not only deepen our understanding of interfacial charge dynamics and surface chemistry but also pave the way towards scalable, durable electrodes for sustainable hydrogen production, underpinning global decarbonisation efforts.

Research from Nature Portfolio

No recent Nature Portfolio content available.

Photoelectrochemical Water Splitting with TiO2 Nanostructures publication trend

The graph below shows the total number of articles in photoelectrochemical water splitting with tio2 nanostructures across all publications each year (not limited to Nature Index journals).

Technical terms

Photoelectrochemical water splitting: A process in which semiconductor photoelectrodes use sunlight to drive the decomposition of water into hydrogen and oxygen.

Photocurrent density: The electrical current generated per unit area of a photoelectrode under illumination, indicating PEC activity.

Incident photon-to-current efficiency (IPCE): The ratio of electrons produced to incident photons at a given wavelength, reflecting light-to-electricity conversion efficiency.

Oxygen vacancy: A missing oxygen atom in the TiO2 lattice that can introduce electronic states favourable for charge transport or catalytic activity.

Heterojunction: An interface between two semiconductor phases or materials with different energy band structures, promoting charge separation.

Charge recombination: The undesirable process where photogenerated electrons and holes recombine without contributing to the water-splitting reaction.

References

1. Regulating the surface of anion-doped TiO2 nanorods by hydrogen annealing for superior photoelectrochemical water oxidation. Nano Convergence (2022).
2. Defect Engineering and Surface Polarization of TiO2 Nanorod Arrays toward Efficient Photoelectrochemical Oxygen Evolution. Catalysts (2022).
3. Enhanced hydrogen evolution reaction performance of anatase–rutile TiO 2 heterojunction via charge transfer from rutile to anatase. Catalysis Science & Technology (2023).