Journal
NATURE COMMUNICATIONS
Volume 12, Issue 1, Pages -Publisher
NATURE RESEARCH
DOI: 10.1038/s41467-021-22991-7
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Funding
- National Natural Science Foundation of China [21971012, 21922502, 21971017, 21625102]
- Beijing Municipal Natural Science Foundation [JQ20007]
- Beijing Institute of Technology Research Fund Program for Young Scholars
- National Key Research and Development Program of China [2020YFB1506300]
- Beijing Institute of Technology Research Fund Program
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The research demonstrates that by decorating porous metal-organic framework membranes with metal single atoms, the photoreduction of CO2 and O-2 can be promoted, enhancing gas diffusion and activation for efficient liquid fuel production.
The demand for sustainable energy has motivated the development of artificial photosynthesis. Yet the catalyst and reaction interface designs for directly fixing permanent gases (e.g. CO2, O-2, N-2) into liquid fuels are still challenged by slow mass transfer and sluggish catalytic kinetics at the gas-liquid-solid boundary. Here, we report that gas-permeable metal-organic framework (MOF) membranes can modify the electronic structures and catalytic properties of metal single-atoms (SAs) to promote the diffusion, activation, and reduction of gas molecules (e.g. CO2, O-2) and produce liquid fuels under visible light and mild conditions. With Ir SAs as active centers, the defect-engineered MOF (e.g. activated NH2-UiO-66) particles can reduce CO2 to HCOOH with an apparent quantum efficiency (AQE) of 2.51% at 420nm on the gas-liquid-solid reaction interface. With promoted gas diffusion at the porous gas-solid interfaces, the gas-permeable SA/MOF membranes can directly convert humid CO2 gas into HCOOH with a near-unity selectivity and a significantly increased AQE of 15.76% at 420nm. A similar strategy can be applied to the photocatalytic O-2-to-H2O2 conversions, suggesting the wide applicability of our catalyst and reaction interface designs. Photoreduction of permanent gas faces challenges in reactant diffusion and activation at the three-phase interface. Here the authors showed porous metal-organic framework membranes decorated by metal single atoms can boost the photoreduction of CO2 and O-2 at the high-throughput gas-solid interface.
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