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Artificial photosynthetic system for diluted CO2 reduction in gas-solid phase
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Journal Article
Artificial photosynthetic system for diluted CO2 reduction in gas-solid phase
2024
Overview
Rational design of robust photocatalytic systems to direct capture and in-situ convert diluted CO
2
from flue gas is a promising but challenging way to achieve carbon neutrality. Here, we report a new type of host-guest photocatalysts by integrating CO
2
-enriching ionic liquids and photoactive metal-organic frameworks PCN-250-Fe
2
M (M = Fe, Co, Ni, Zn, Mn) for artificial photosynthetic diluted CO
2
reduction in gas-solid phase. As a result, [Emim]BF
4
(39.3 wt%)@PCN-250-Fe
2
Co exhibits a record high CO
2
-to-CO reduction rate of 313.34 μmol g
−1
h
−1
under pure CO
2
atmosphere and 153.42 μmol g
−1
h
−1
under diluted CO
2
(15%) with about 100% selectivity. In scaled-up experiments with 1.0 g catalyst and natural sunlight irradiation, the concentration of pure and diluted CO
2
(15%) could be significantly decreased to below 85% and 10%, respectively, indicating its industrial application potential. Further experiments and theoretical calculations reveal that ionic liquids not only benefit CO
2
enrichment, but also form synergistic effect with Co
2+
sites in PCN-250-Fe
2
Co, resulting in a significant reduction in Gibbs energy barrier during the rate-determining step of CO
2
-to-CO conversion.
Artificial photosynthetic diluted CO
2
reduction from fuel gas is promising but challenging for carbon neutrality. Here, the authors report a host-guest system by integrating CO
2
-enriching ionic liquids and photoactive metal-organic frameworks, greatly enhancing CO
2
-to-CO conversion efficiency.
