Selective CO2 Photoreduction Enabled by Water-stable Cu-based Metal-organic Framework Nanoribbons

Chemphyschem. 2024 Jan 9:e202300368. doi: 10.1002/cphc.202300368. Online ahead of print.ABSTRACTThe goal of photocatalytic CO2 reduction system is to achieve near 100% selectivity for the desirable product with reasonably high yield and stability. Here, two-dimensional metal-organic frameworks are constructed with abundant and uniform monometallic active sites, aiming to be an emerged platform for efficient and selective CO2 reduction. As an example, water-stable Cu-based metal-organic framework nanoribbons with coordinatively unsaturated single CuII sites are first fabricated, evidenced by X-ray diffraction patterns and X-ray absorption spectroscopy. In situ Fourier-transform infrared spectra and Gibbs free energy calculations unravel the formation of the key intermediate COOH* and CO* is an exothermic and spontaneous process, whereas the competitive hydrogen evolution reaction is endothermic and non-spontaneous, which accounts for the selective CO2 reduction. As a result, in an aqueous solution containing 1 mol L-1 KHCO3 and without any sacrifice reagent, the water-stable Cu-based metal-organic framework nanoribbons exhibited an average CO yield of 82 μmol g-1 h-1 with the selectivity up to 97% during 72 h cycling test, which is comparable to other reported photocatalysts under similar conditions.PMID:38193665 | DOI:10.1002/cphc.202300368
Source: Chemphyschem - Category: Chemistry Authors: Source Type: research