Mixtures of NiCo 2O 4 and FeO x were obtained by thermal decomposition of the nitrates of Ni, Co, and Fe in appropriate proportions. Two series of electrodes were prepared: (1) at constant composition (20 mol% FeO x ) and various calcination temperatures in the range 200 to 480 °C and (2) at constant calcination temperature (300 °C) and various compositions in the whole composition range 0 to 100 mol% FeO x . The oxide layers were characterized by thermogravimetric analysis, X-ray diffraction, scanning electron microscopy, and cyclic voltammetry. Experimental data showed that the layers consist of a mixture of phases in which Fe oxide is present as Fe 2O 3. The electrocatalytic properties were assessed by means of quasi-stationary potentiostatic current-potential curves for the O 2 evolution reaction from alkaline solution. Results have shown that the mechanism of O 2 evolution depends on composition moderately. The electrocatalytic activity appears to depend on composition only slightly.

Effect of FeOx on the electrocatalytic properties of NiCo2O4 for O-2 evolution from alkaline solutions / E. Guerrini, M. Piozzini, A. Castelli, A. Colombo, S. Trasatti. - In: JOURNAL OF SOLID STATE ELECTROCHEMISTRY. - ISSN 1432-8488. - 12:4(2008), pp. 363-373.

Effect of FeOx on the electrocatalytic properties of NiCo2O4 for O-2 evolution from alkaline solutions

E. Guerrini;A. Colombo;S. Trasatti
2008

Abstract

Mixtures of NiCo 2O 4 and FeO x were obtained by thermal decomposition of the nitrates of Ni, Co, and Fe in appropriate proportions. Two series of electrodes were prepared: (1) at constant composition (20 mol% FeO x ) and various calcination temperatures in the range 200 to 480 °C and (2) at constant calcination temperature (300 °C) and various compositions in the whole composition range 0 to 100 mol% FeO x . The oxide layers were characterized by thermogravimetric analysis, X-ray diffraction, scanning electron microscopy, and cyclic voltammetry. Experimental data showed that the layers consist of a mixture of phases in which Fe oxide is present as Fe 2O 3. The electrocatalytic properties were assessed by means of quasi-stationary potentiostatic current-potential curves for the O 2 evolution reaction from alkaline solution. Results have shown that the mechanism of O 2 evolution depends on composition moderately. The electrocatalytic activity appears to depend on composition only slightly.
Electrocatalysis; Fe oxide; NiCo 2O 4 ; O 2 evolution; Oxide electrodes
Settore CHIM/02 - Chimica Fisica
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2434/56277
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