Preparation of cobalt polyporphine and its catalytic properties in oxygen electroreduction

D. V Konev (1) , K. V Lizgina , D. K Khairullina , M. A Shamraeva , Charles H. Devillers (2) , M. A Vorotyntsev (1)

1 Institute of Problems of Chemical Physics of RAS
2 ICMUB - Institut de Chimie Moléculaire de l'Université de Bourgogne [Dijon]

A new member of the polyporphine series-cobalt polyporphine of type I (pCoP-I)-was prepared from the starting magnesium polyporphine of type I (pMgP-I) by ion exchange, i.e. by sequential processing of the pMgP-I polymer film on the electrode surface with solutions of trifluoroacetic acid (forming metalfree polyporphine of type I, pH2P-I) and cobalt(II) acetate in organic solvents. The completeness of each stage of ion exchange can be judged from the change in the electrochemical and spectral characteristics of the obtained polymer films of unsubstituted porphine (рH2P-I) and cobalt porphine (pCoP-I) of type I. Oxidative transformation of this polyporphine pCoP-I was performed, which led to the formation of additional bonds between the neighboring porphine units in the polymer film (transition of polymer of type I into polymer of type II, pCoP-II). The behavior of the polymer films of cobalt polyporphine of types I and II in oxygen electroreduction was studied. The films showed catalytic activity in this process.

Mots clés: electropolymerization; porphine; metal porphines; conductive polymer; oxygen electroreduction; polymer-modified electrodes

Domaines: Chimie de coordination; Polymères; Catalyse; Autre

D. V Konev, K. V Lizgina, D. K Khairullina, M. A Shamraeva, Charles H. Devillers, et al.. Preparation of cobalt polyporphine and its catalytic properties in oxygen electroreduction. Elektrokhimiya / Russian Journal of Electrochemistry, 2016, 52 (8), pp.778-787. ⟨10.1134/S1023193516060069⟩. ⟨hal-03471752⟩