Journal
CHEMICAL ENGINEERING JOURNAL
Volume 431, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2021.134125
Keywords
High-index facets; NH2-MIL-125(Ti); Metal-organic frameworks; Carbon dioxide; Photocatalytic reduction
Categories
Funding
- National Natural Science Foundation of China [22171131]
- National Basic Research Program of China [2017YFA0303504]
- Priority Aca-demic Program Development of Jiangsu Higher Education Institutions
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Facet engineering of NH2-MIL-125(Ti) with exposed high-index {1 1 2} facets is found to significantly enhance its photocatalytic activity for CO2 conversion, with 33 and 31 times higher CO and CH4 production rates compared to {00 1}/{1 1 1} facets. The superior activity is attributed to the large CO2 uptake and efficient photoexcitation, charge separation and migration behaviors of the exposed high-index facets.
Facets exposed on metal-organic frameworks (MOFs) are considered to be responsible for the efficiency of photocatalytic CO2 conversion. Here, NH2-MIL-125(Ti) with exposed high-index {1 1 2} facets has been investigated in detail for photocatalytic CO2 reduction. Compared with low-index facets, the high-index {1 1 2} facets exhibit superior activity for CO2-to-CO and CO2-to-CH4 conversions, which are 33 and 31 times higher for CO and CH4 productions than the {00 1}/{1 1 1} facets. The superior photocatalytic activity is attributed to the large CO2 uptake, efficient photoexcitation, charge separation and migration behaviors of the NH2-MIL-125(Ti) with exposing high-index facets. This study provides an effective strategy to develop MOFs catalysts via facet engineering for targeted performance.
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