Spin polarization in Fe-doped CsPbBr3 perovskite nanocrystals for enhancing photocatalytic CO2 reduction
Chemical Engineering Journal(2024)
摘要
Spin manipulation offers an effective strategy to enhance photocatalytic activity in metal halide perovskites by suppressing the recombination of photo-excited electrons. However, the scope of the magnetic dopant inducing spin polarization is still limited. Here, we introduce synergetic strategies to polarize the spin in photo-excited electrons and boost their photocatalytic activity for CO2 reduction. We dope iron cation (Fe2+) into CsPbBr3 perovskite nanocrystals (PNCs). Fe ions induce paramagnetism, fostering spin polarization within the Fe-doped CsPbBr3 PNCs (Fe-CsPbBr3 PNCs) under magnetic fields. The magnetic compositions in PNC tend to stabilize the spin polarized electrons within the PNC, mitigate the recombination of photo-excited electrons and enhance the redox reaction for photocatalytic CO2 reduction. The synergistic effects of magnetic element doping and the application of magnetic fields resulted in a photocatalytic CO2 reduction of 133.04 g−1, which is 1.68-fold increase compared to the Fe-PNC without a magnetic field. This work provides a simple and environmentally friendly approach to CO2 reduction based on PNCs.
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关键词
Photocatalyst,CO2 reduction,Spin polarization,Magnetic field,Iron doping
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