CO2 to CO Electroreduction,Electrocatalytic H2 Evolution,and Catalytic Degradation of Organic Dyes Using a Co(II) meso-Tetraarylporphyrin |
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| Authors: | Mouhieddinne Guergueb Frdrique Loiseau Florian Molton Habib Nasri Axel Klein |
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| Institution: | 1.Faculty of Sciences of Monastir, University of Monastir, Avenue de l’Environnement, Monastir 5019, Tunisia;2.Département de Chimie Moléculaire (DCM), CNRS UMR 5250, Université Grenoble Alpes, F-38000 Grenoble, France; (F.L.); (F.M.);3.Department of Chemistry, Faculty of Mathematics and Natural Sciences, Institute for Inorganic Chemistry, University of Cologne, 50939 Cologne, Germany |
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| Abstract: | 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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| Keywords: | cobalt(II) porphyrins cyclic voltammetry electrocatalytic hydrogen evolution electroreduction CO2 to CO catalytic degradation of dyes |
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