EQCM and RDE/RRDE Study of Soluble Iron Phthalocyanine Bifunctional Catalyst for the Lithium-Oxygen Battery

TORRES, WALTER RAMÓN; DAVIA, FEDERICO GABRIEL; DEL POZO VAZQUEZ, MARÍA; TESIO, ALVARO YAMIL; CALVO, ERNESTO JULIO

JOURNAL OF THE ELECTROCHEMICAL SOCIETY

ELECTROCHEMICAL SOC INC

Año: 2017 vol. 164 p. 3785 - 3792

0013-4651

Soluble iron phtalocyanine (FePc) has been studied as a bifunctional catalyst for the oxygen reduction reaction (ORR) and oxygen evolution (OER) in lithium air cathodes by means of electrogravimetry with shear wave dissipation, cyclic voltammetry (CV) and rotating ring disk electrode (RRDE). The oxygen reduction reaction (ORR) has been studied on Au in oxygen saturated TBA-PF6 in DMSO and LiTFSI-DMSO electrolyte for increasing concentration of Fe-phtalocyanine as redox mediator for the two-electron ORR at 2.2 V and the oxidation of the surface Li2O2 product below 3.6 V vs. Li/Li+ where the solvent is stable. The soluble FePc catalyst promotes the ORR solution phase mechanism.