Understanding the effects of composition engineering in halide perovskite photocatalysts to enhance CO2 photoreduction efficiency

초록

Photocatalytic CO2 reduction is an energy-efficient approach to reduce CO2 emissions and convert CO2 into value-added chemicals. Metal halide perovskite (MHP) photocatalysts have emerged as promising materials for diverse photocatalytic applications, especially for CO2 photoreduction. Due to their tunable bandgap, strong light absorption in the visible range, high negative reduction potential, outstanding defect tolerance, and facile and cost-effective synthesis, MHPs are considered ideal candidates for CO2 photoreduction. This review analyzes how the A-site cations (Cs+, FA+, MA+), B-site cations (Pb2+, Sn2+, Bi3+, etc.), and halide anions (Cl-, Br-, I-) influence the intrinsic properties of perovskite materials and their photocatalytic CO2 reduction performance. The effects of cations and anions on perovskite structure, band energy, redox potential, active sites, charge dynamics, morphology, and stability are reviewed, along with CO2 reduction mechanisms, to provide a comprehensive understanding of sustainable CO2 treatment technology. Moreover, the existing challenges and research needs are also highlighted.

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