Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 10, Issue 44, Pages 37919-37927Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b07795
Keywords
cobalt porphyrin; iron porphyrin; rhenium bipyridine; covalent-organic framework; CO2 reduction
Funding
- University of Southern California (USC)
- USC Wrigley Institute
- National Science Foundation (NSF) through the CAREER award [CHE-1555387]
- Nanoporous Materials Genome Center of the U.S. Department of Energy, Office of Basic Energy Sciences, Division of Chemical Sciences, Geosciences and Biosciences [DE-FG02-17ER16362]
- NSF [CRIF 1048807]
- USC
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The incorporation of homogeneous catalysts for CO2 reduction into extended frameworks has been a successful strategy for increasing catalyst lifetime and activity, but the effects of the linkers on catalysis are underexplored. In this work, a novel rhenium bipyridine complex was synthesized for the purpose of designing a covalent-organic framework (COF) with both metalloporphyrin and metal bipyridine moieties. Investigation of the rhenium complex as a homogeneous catalyst shows a faradaic efficiency of 81(8)% for the electrocatalytic conversion of CO2 to CO upon the addition of methanol as the proton source. Treatment of the rhenium complex with tetra(4-aminophenyl)porphyrin under Schiff base conditions produces the desired COF, as indicated by powder X-ray diffraction (PXRD) studies. Metalation of the porphyrins was accomplished through postsynthetic modification with CoCl2 and FeCl3 metal precursors. The retention of the PXRD peaks and appearance of new Co and Fe peaks in the corresponding X-ray photoelectron spectroscopy spectra suggest the successful incorporation of a secondary metal site into the framework. Cyclic voltammetry measurements display increases in current densities when the atmosphere is changed from N-2 to CO2. Controlled potential electrolyses show that the cobalt-postmetalated COF has the highest activity toward CO2 reduction, reaching a faradaic efficiency of 18(2)%.
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