CO2 to CO Electroreduction, Electrocatalytic H2 Evolution, and Catalytic Degradation of Organic Dyes Using a Co(II) meso-Tetraarylporphyrin

The meso-tetrakis(4-(trifluoromethyl)phenyl)porphyrinato cobalt(II) complex [Co(TMFPP)] was synthesised in 93% yield. The compound was studied by 1H NMR, UV-visible absorption, and photoluminescence spectroscopy. The optical band gap Eg was calculated to 2.15 eV using the Tauc plot method and a semi...

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Published in:Molecules (Basel, Switzerland) Vol. 27; no. 5; p. 1705
Main Authors: Guergueb, Mouhieddinne, Loiseau, Frédérique, Molton, Florian, Nasri, Habib, Klein, Axel
Format: Journal Article
Language:English
Published: Basel MDPI AG 05.03.2022
MDPI
Subjects:
Catalysis
catalytic degradation of dyes
Chemical Sciences
Cobalt
cobalt(II) porphyrins
Composite materials
Coordination chemistry
cyclic voltammetry
electrocatalytic hydrogen evolution
Electrodes
electroreduction CO2 to CO
Ligands
Other
Spectrum analysis
CO 2 reduction
Catalysis
Electrolysis
Iron Porphyrin
Spectroelectrochemistry
ISSN:1420-3049, 1420-3049
Online Access:Get full text
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Summary:The meso-tetrakis(4-(trifluoromethyl)phenyl)porphyrinato cobalt(II) complex [Co(TMFPP)] was synthesised in 93% yield. The compound was studied by 1H NMR, UV-visible absorption, and photoluminescence spectroscopy. The optical band gap Eg was calculated to 2.15 eV using the Tauc plot method and a semiconducting character is suggested. Cyclic voltammetry showed two fully reversible reduction waves at E1/2 = −0.91 V and E1/2 = −2.05 V vs. SCE and reversible oxidations at 0.30 V and 0.98 V representing both metal-centred (Co(0)/Co(I)/Co(II)/Co(III)) and porphyrin-centred (Por2−/Por−) processes. [Co(TMFPP)] is a very active catalyst for the electrochemical formation of H2 from DMF/acetic acid, with a Faradaic Efficiency (FE) of 85%, and also catalysed the reduction of CO2 to CO with a FE of 90%. Moreover, the two triarylmethane dyes crystal violet and malachite green were decomposed using H2O2 and [Co(TMFPP)] as catalyst with an efficiency of more than 85% in one batch.
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Dedicated to Prof. Dr. Wolfgang Beck on the occasion of his 90th birthday.
ISSN:1420-3049
1420-3049
DOI:10.3390/molecules27051705