期刊
NATURE COMMUNICATIONS
卷 11, 期 1, 页码 -出版社
NATURE PORTFOLIO
DOI: 10.1038/s41467-020-16227-3
关键词
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资金
- EPSRC [EP/L017008/01, EP/K021192/1, EP/L018330/1, EP/S018204/2/1]
- Leverhulme Trust [RPG-2017-122]
- Newton Advanced Fellowship grant [NA170422, NAF\R1\191163]
- FRQNT
- NSERC
- CSC Scholarship
- ERC AdG Intersolar grant [291482]
- EPSRC CDT [EP/L015277/1]
Solar-driven CO2 reduction by abundant water to alcohols can supply sustainable liquid fuels and alleviate global warming. However, the sluggish water oxidation reaction has been hardly reported to be efficient and selective in CO2 conversion due to fast charge recombination. Here, using transient absorption spectroscopy, we demonstrate that microwave-synthesised carbon-dots ((CD)-C-m) possess unique hole-accepting nature, prolonging the electron lifetime (t(50%)) of carbon nitride (CN) by six folds, favouring a six-electron product. (CD)-C-m-decorated CN stably produces stoichiometric oxygen and methanol from water and CO2 with nearly 100% selectivity to methanol and internal quantum efficiency of 2.1% in the visible region, further confirmed by isotopic labelling. Such (CD)-C-m rapidly extracts holes from CN and prevents the surface adsorption of methanol, favourably oxidising water over methanol and enhancing the selective CO2 reduction to alcohols. This work provides a unique strategy for efficient and highly selective CO2 reduction by water to high-value chemicals. Solar-driven CO2 reduction by abundant water to alcohols is hindered by the sluggish water oxidation reaction. Here, the authors demonstrate that the microwave-synthesized carbon-dots possess unique hole-accepting nature, allowing stoichiometric oxygen and methanol production from water and CO2 with nearly 100% selectivity to methanol.
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