Enhanced Catalytic Activity of Cobalt Porphyrin in CO2 Electroreduction upon Immobilization on Carbon Materials

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DOI

In a comparative study of the electrocatalytic CO2 reduction, cobalt meso-tetraphenylporphyrin (CoTPP) is used as a model molecular catalyst under both homogeneous and heterogeneous conditions. In the former case, employing N,N-dimethylformamide as solvent, CoTPP performs poorly as an electrocatalyst giving low product selectivity in a slow reaction at a high overpotential. However, upon straightforward immobilization of CoTPP onto carbon nanotubes, a remarkable enhancement of the electrocatalytic abilities is seen with CO2 becoming selectively reduced to CO (>90%) at a low overpotential in aqueous medium. This effect is ascribed to the particular environment created by the aqueous medium at the catalytic site of the immobilized catalyst that facilitates the adsorption and further reaction of CO2. This work highlights the significance of assessing an immobilized molecular catalyst from more than homogeneous measurements alone.

Original languageEnglish
JournalAngewandte Chemie International Edition
Volume56
Issue23
Pages (from-to)6468-6472
Number of pages5
ISSN1433-7851
DOIs
Publication statusPublished - 1 Jun 2017

    Research areas

  • CO2 conversion, electrocatalysis, heterogeneous catalyst, immobilization, molecular catalyst, ELECTROCHEMICAL REDUCTION, ELECTROCATALYTIC REDUCTION, HOMOGENEOUS CATALYSIS, CO2-TO-CO CONVERSION, ORGANIC FRAMEWORKS, AQUEOUS-SOLUTION, DIOXIDE, ELECTRODES, COMPLEXES, WATER

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