Photocatalytic CO2 Reduction Using Perovskite Heterojunctions

Photocatalytic CO2 reduction with perovskite heterojunctions represents a frontier in solar‐to‐fuel conversion, combining the outstanding optoelectronic properties of perovskite materials with tailored semiconductor interfaces to drive CO2 transformation under light irradiation. Perovskites offer tunable band gaps, high absorption coefficients and favourable charge‐carrier mobilities, yet their intrinsic instability and rapid electron–hole recombination limit practical utility. Heterojunction engineering—particularly Z-scheme and S-scheme architectures—has emerged as a powerful strategy to overcome these challenges by establishing built-in electric fields or selective carrier pathways at the interface of perovskite and partner semiconductors. These designs promote spatial separation of photogenerated electrons and holes, enhance redox driving forces and improve product selectivity for CO, CH4 or other solar fuels. State-of-the-art studies span combinations of halide perovskites with metal oxides, carbon nitrides and graphene‐derived materials, emphasising scalable synthesis, interface stability and mechanistic insight. The global significance of this work lies in its potential to convert greenhouse gas into value‐added chemicals using sunlight, offering a sustainable approach to energy and environmental challenges.

Research from Nature Portfolio

Recent studies have demonstrated the construction of self-assembled S-scheme heterojunctions between titanium dioxide and cesium lead bromide perovskite quantum dots through an electrostatic self-assembly protocol. Combined theoretical modelling and in situ spectroscopic analysis reveal the formation of an internal electric field at the interface, directing photogenerated electrons and holes along distinct pathways. This robust S-scheme configuration nearly doubles the CO2 photoreduction rate compared with bare titanium dioxide, achieving an improved conversion of CO2 to CO under visible light. Isotopic labelling confirms that all reduction products derive exclusively from CO2 feedstock, highlighting the reliability of the system for solar‐fuel synthesis.

Photocatalytic CO2 Reduction Using Perovskite Heterojunctions publication trend

The graph below shows the total number of articles in photocatalytic co2 reduction using perovskite heterojunctions across all publications each year (not limited to Nature Index journals).

Technical terms

Photocatalysis: Light-driven acceleration of chemical reactions on a semiconductor surface, producing reactive charge carriers that convert CO2 into reduced products.

Perovskite: A class of materials with the general formula ABX3, where A and B are cations and X is an anion (often a halide), known for tunable electronic and optical properties.

Heterojunction: The interface formed between two dissimilar semiconductors, engineered to facilitate charge separation and transfer under illumination.

Z-scheme heterojunction: A photocatalytic arrangement in which two semiconductors mimic natural photosynthesis pathways, preserving high redox potentials for both oxidation and reduction.

S-scheme heterojunction: A staggered energy‐band alignment that creates an internal electric field at the interface, driving directional migration of electrons and holes to improve separation.

Photogenerated carriers: Electrons and holes created when a semiconductor absorbs photons with energy exceeding its band gap, which participate in redox reactions.

References

1. Unique S-scheme heterojunctions in self-assembled TiO2/CsPbBr3 hybrids for CO2 photoreduction. Nature Communications (2020).
2. Cs3Bi2Br9/g‑C3N4 Direct Z‑Scheme Heterojunction for Enhanced Photocatalytic Reduction of CO2 to CO. Chemistry of Materials (2023).
3. S-Scheme Heterojunction Photocatalysts for CO2 Reduction. Catalysts (2024).
4. A g-C 3 N 4 /rGO/Cs 3 Bi 2 Br 9 mediated Z-scheme heterojunction for enhanced photocatalytic CO 2 reduction. Journal of Materials Chemistry A (2024).