Preparation and characterisation of spinel oxide ferrites suitable for oxygen evolution anodes

Mendonça, M.H.; Godinho, M.; Catarino, Mónica; Pereira, M. I. da Silva; Costa, F.M.

doi:10.1016/s1293-2558(01)01238-9

Cited by 40 publications

(18 citation statements)

References 11 publications

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“…The oxygen overpotential for Ni 0.4 Mg 0.6 Fe 2 O 4 was very low compared with other electrodes. This may be due to the substitution of Mg 2 + ions, which creates the change in reaction mechanism, and consequently, the intrinsic activity of the base material [15]. It is seen that the Tafel slopes in the lower and higher potential regions are 50-90 and 200-230 mV/dec, respectively, which are in agreement with the value reported on NiFe 2 O 4 , prepared by thermal decomposition method using metal nitrate salts at 1150 jC [16].…”

Section: Electrochemical Studiessupporting

confidence: 84%

Evaluation of Mg2+-substituted NiFe2O4 as a green anode material

2004

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Section: Electrochemical Studiessupporting

confidence: 84%

Evaluation of Mg2+-substituted NiFe2O4 as a green anode material

2004

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“…This indicates that a (Transfer Coefficient) will be different for all the four cases and the path and mechanism will not be the same for them. Hence, a comparison of the electrocatalyic behavior is made at certain fixed current densities and at two low over potentials (Table 1) [13,43] [9].…”

Section: Powder Morphology Analysismentioning

confidence: 99%

Mechanochemical Synthesis and Electrochemical Characterization of Nano Crystalline Calcium Ferrite

et al. 2011

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The studies on the mechanochemical synthesis and electrochemical characterization of orthorhombic calcium ferrite (CaFe 2 O 4 ) are reported in this paper. Stoichiometric mixtures of a-Fe 2 O 3 and granulated Ca metal were used as the starting materials for the synthesis process. The synthesized calcium ferrite was characterized by roomtemperature Mössbauer spectra, XRD and TEM. The electrochemical characterisation was carried out using cyclic voltammetry studies. Mössbauer spectra provide the yield of the reaction, information on the charge status, the local symmetry and the magnetic state of the iron ions in the mechanosynthesized ferrite material. XRD analysis of the CaFe 2 O 4 compound reveals the orthorhombic crystal structure with an average crystalline size of about 28 nm. TEM micrographs reveal the nanoparticles with irregular crystal morphology ranging from 8 to 30 nm. The electrochemical studies clearly show that the calcium ferrite compound can act as an electrocatalyst for Oxygen Evolution Reaction (OER).

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“…Spinel ferrites are of great fundamental and technological important due to their structural, electronic, magnetic and catalytic properties [2]. The physico-chemical properties of these ferrospinels are strongly dependent on the sites and the nature of the catalyst [3], which are closely related to the method of preparation [4].…”

Section: Introductionmentioning

confidence: 99%

“…The physico-chemical properties of these ferrospinels are strongly dependent on the sites and the nature of the catalyst [3], which are closely related to the method of preparation [4]. There are two kinds of lattices for the cation occupancy in M II Fe 2 The decomposition of hydrogen peroxide has been catalyzed by a number of ferrites in the alkaline media [5] and in a neutral medium (pH 6.6) [6], being the effectiveness of the catalyst dependent on the ferrites composition. In a recent investigation [7], the rate of decomposition of hydrogen peroxide has been compared when controlled nano-sized magnetite powders are used * Corresponding author.…”

Section: Introductionmentioning

confidence: 99%