Electrochemical activation of CO2 by MOF-(Fe, Ni, Mn) derivatives of 5-aminoisophthalic acid and the thiazole group influence on its catalytic activity. (9th March 2022) - Robles-Marín, Elvis
Abstract : The electrocatalysis of carbon dioxide using earth abundant metals and a functionalized MOF to find a sustainable process was investigated. Abstract : Five new coordination polymers, [Fe(AIP)] (1 ), [M(L)] [M = Fe (2 ), Ni (3 )], [NiFe(L)] (4 ), and [Mn(L)] (5 ) (H2 AIP = 5-aminoisophthalic acid, LH2 = 5-((thiazol-2-ylmethyl)amino)isophthalic acid), were synthesized under solvothermal conditions and characterized using ATR-IR spectroscopy, ESR spectroscopy, and elemental analysis; 1 and 5 were characterized by single-crystal X-ray diffraction. Cyclic voltammetry (CV) under a carbon dioxide atmosphere, with an aqueous solution of KCl at 0.1 M, showed that 1 did not show electrochemical activity with CO2 . In contrast, complex 2 does work as an electrocatalyst, as it reduces CO2 to CO. Compounds 3 and 4 seem to activate CO2, generating the intermediate type [Ni 1+ -CO], without electrocatalytic activity. Only complex 5 performs oxidation processes owing to its high electronic stability. From ESR and single-crystal X-ray diffraction, 5 has a Paddle-Wheel agglomerate with an Mn–Mn interaction, not common for [Mn2 ] 4+ type species.