Molecular Electrocatalysis for Oxygen Reduction by Cobalt Porphyrins Adsorbed at Liquid/Liquid Interfaces

0341539 - ÚFCH JH 2011 RIV US eng J - Článek v odborném periodiku
Su, B. - Hatay, I. - Trojánek, Antonín - Samec, Zdeněk - Khoury, T. - Gros, C. P. - Barbe, J.-M. - Daina, A. - Carrupt, P. A. - Girault, H. H.
Molecular Electrocatalysis for Oxygen Reduction by Cobalt Porphyrins Adsorbed at Liquid/Liquid Interfaces.
Journal of the American Chemical Society. Roč. 132, č. 8 (2010), s. 2655-2662. ISSN 0002-7863. E-ISSN 1520-5126
Grant CEP: GA ČR(CZ) GA203/07/1257; GA MŠMT OC 177
Výzkumný záměr: CEZ:AV0Z40400503
Klíčová slova: electrocatalysis * atomic physicochemical parameters * immiscible electrolyte solution
Kód oboru RIV: CG - Elektrochemie
Impakt faktor: 9.019, rok: 2010

Molecular electrocatalysis for oxygen reduction at a polarized water/1,2-dichloroethane (DCE) interface was studied, involving aqueous protons, ferrocene (Fc) in DCE and amphiphilic cobalt porphyrin catalysts adsorbed at the interface. The catalyst, (2,8,13,17-tetraethyl-3,7,12,18-tetramethyl-5-p-aminophenylporphyrin) cobalt(II) (CoAP), functions like conventional cobalt porphyrins, activating 02 via coordination by the formation of a superoxide structure. Furthermore, due to the hydrophilic nature of the aminophenyl group, CoAP has a strong affinity for the water/DCE interface as evidenced by lipophilicity mapping calculations and surface tension measurements, facilitating the protonation of the CoAP-O-2 complex and its reduction by ferrocene. The reaction is electrocatalytic as its rate depends on the applied Galvani potential difference between the two phases.
Trvalý link: http://hdl.handle.net/11104/0184484