Noncovalent Immobilization of a Molecular Iron-Based Electrocatalyst on Carbon Electrodes for Selective, Efficient CO2-to-CO Conversion in Water
Laboratoire d’Electrochimie
Moléculaire, Univerity of Paris Diderot,
Sorbonne Paris Cité, UMR 7591 CNRS, 15 rue Jean- Antoine de Baïf, F-75205 Paris Cedex 13, France
J. Am. Chem. Soc., Article ASAP
DOI: 10.1021/jacs.5b12652
Abstract
Catalysis
of fuel-producing reactions can be transferred from homogeneous
solution to surface via attachment of the molecular catalyst. A
pyrene-appended iron triphenyl porphyrin bearing six pendant OH groups
on the phenyl rings in all ortho and ortho′ positions was immobilized on
carbon nanotubes via noncovalent interactions and further deposited on
glassy carbon. X-ray photoelectron spectroscopy and electrochemistry
confirm catalyst immobilization. Using the carbon material, highly
selective and rapid catalysis of the reduction of CO2 into CO
occurs in water (pH 7.3) with 480 mV overpotential. Catalysis could be
sustained for hours without loss of activity and selectivity, and high
turnover number was obtained.
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