Electrocatalytic properties of new active ternary ferrite film anodes for O2 evolution in alkaline medium

Singh, R.N.; Singh, Narendra Kumar; Singh, Jitendra

doi:10.1016/s0013-4686(02)00354-7

Cited by 90 publications

(62 citation statements)

References 31 publications

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“…and negative (E k-) potential limits on the voltammetric responses of each oxide electrodes was performed (Figs. [5][6][7][8]. Figure 5a shows the influence of the potential limits on the voltammetric behaviour of Co 3 O 4 oxide electrode when the starting potential is 0.500 V. Two cathodic peaks appear at ca.…”

Section: Effect Of the Scan Potential Limits On The Oxides Voltammetrmentioning

confidence: 99%

“…Moreover, spinel-type oxides containing iron and cobalt have also generated great interest due to the possible applications as anode materials for batteries [4] and high density recording media [5]. Several studies on the catalytic activity for OER of spinel-type oxide thin films containing cobalt and iron have been published, namely on cobalt ferrite CoFe 2 O 4 where the Fe is partially replaced by Ni and or Mn [6], Fe x Co 3-x O 4 (0 B x B 2) [7] and ternary ferrites CoFe 2-x Cr x O 4 (0 B x B 1) [8]. These studies show that the solid-state surface redox transitions (SSSRT), which take place on electrode surfaces, play a crucial role in their activity.…”

Section: Introductionmentioning

confidence: 99%

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Electrochemical behaviour of Fe x Co3−x O4 with (x = 0, 1, 2 and 3) oxides thin film electrodes in alkaline medium

et al. 2009

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Spinel-type Fe x Co 3-x O 4 thin films with x = 0, 1, 2 and 3 were prepared, on stainless steel supports, using the thermal decomposition method at 400°C. The X-ray diffraction patterns show the presence of a spinel-type structure with a low crystallinity. The electrochemical behaviour was investigated in 1 M KOH, using open-circuit-potential measurements and cyclic voltammetry. The studies allowed to observe the redox reactions occurring at the Fe x Co 3-x O 4 (x = 1 and 2) oxide surface, namely Fe 3 O 4 / Fe(OH) 2 or Fe 3 O 4 /Fe 2 O 3 , Co 3 O 4 /CoOOH, Co(OH) 2 /CoO OH and CoO 2 /CoOOH by comparing the experimental data with those obtained for the Co 3 O 4 and Fe 3 O 4 films as well as with those referred to in the literature. The results show that iron ions play the major role in the solid-state surface redox transitions in the negative potential range, whereas the cobalt ions are the key species in the positive potential range. However, the contribution of each component, although small, has to be considered in both potential regions.

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Section: Effect Of the Scan Potential Limits On The Oxides Voltammetrmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Electrochemical behaviour of Fe x Co3−x O4 with (x = 0, 1, 2 and 3) oxides thin film electrodes in alkaline medium

et al. 2009

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“…Amongst the anode materials for which impedance responses at overpotentials associated with significant OER current densities have been detailed are: oxidised polycrystalline Ni [2], Co [3] and Pt [4], cobalt oxides deposited on various substrates [5][6][7], Co and Ni mixed oxides [8,9] and alloys [10], perovskites (e.g. La 0.5 Ba 0.5 CoO 3 [11] or various ferrites [12]), IrO 2 and related materials [13][14][15][16] and various amorphous alloys [17,18].…”

Section: Introductionmentioning

confidence: 99%

The significance of electrochemical impedance spectra recorded during active oxygen evolution for oxide covered Ni, Co and Fe electrodes in alkaline solution

Lyons

Brandon

2009

Journal of Electroanalytical Chemistry

201

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Please cite this article as: M.E.G. Lyons, M.P. Brandon, The significance of electrochemical impedance spectra recorded during active oxygen evolution for oxide covered Ni, Co and Fe electrodes in alkaline solution, Journal of Electroanalytical Chemistry (2009Chemistry ( ), doi: 10.1016Chemistry ( /j.jelechem.2009 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. ACCEPTED MANUSCRIPTTitle: The significance of electrochemical impedance spectra recorded during active oxygen evolution for oxide covered Ni, Co and Fe electrodes in alkaline solution. Abstract: Although the mechanism for the oxygen evolution reaction (OER) is likely to be similar for oxidised electrodes of the adjacent transition metals Ni, Co and Fe, the electrochemical impedance spectra, recorded for each of these anodes during oxygen evolution in 1.0 M NaOH, are significantly different in appearance. This impedance data is analysed using an approach similar to that of Cahan and Chen [1] in an earlier important article on this topic. A controversial proposal by these workers that OER "Tafel slopes" (measured by either ac or dc techniques) for many electrode systems are not in fact characteristic of the kinetics of the reaction, but instead of the potential dependent conductivity of the oxide, is dismissed on the basis of our data. In the case of Co however, it is found that the kinetics of the OER are masked by a dominant low frequency pseudo-capacitance, arising most likely from a nonhomogeneous surface charge distribution associated with the oxidation of Co(III) to Co(IV) oxy-hydroxide species. A consistent interpretation of the data is provided, which envisages that Fe exhibits the most general impedance response with the spectra for the other anodes taking the form of limiting cases. Consideration is also given to the most appropriate choice of equivalent circuit model (with a firm physical basis) to aid our understanding of the complex interface at which oxygen evolution proceeds.

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“…Among Fe-Co oxides, the spinel cobalt ferrite oxide, CoFe 2 O 4 , presents interesting electrochemical properties and a good stability in alkaline solutions. Recently, cobalt ferrite oxide electrodes were studied as anodes for batteries [2][3][4] and the oxygen evolution reaction (OER) [5]. On the other hand, polypyrrole/CoFe 2 O 4 composite films have been studied as cathode for the oxygen reduction reaction (ORR) [6].…”

Section: Introductionmentioning

confidence: 99%

Cathodic behaviour of CoFe2O4 spinel electrodes in alkaline medium

et al. 2011

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Spinel type CoFe 2 O 4 thin films have been prepared, on stainless steel supports, by thermal decomposition of aqueous solutions of mixed cobalt and iron nitrates in 1:2 molar ratio at 400°C. The electrochemical behaviour of the CoFe 2 O 4 /1 M KOH interface was investigated by cyclic voltammetry, chronoamperometry and impedance techniques. The studies allowed finding out the redox reactions occurring at the oxide surface. The results were compared with colloidal electrodes prepared by alkaline precipitation of Fe(II) or Fe(III) hydrous oxihydroxides on platinum electrodes. In addition, it has been concluded that the processes are diffusion-controlled and the diffusion of the hydroxide ion, through the oxide, acts as the rate-determining step. The diffusion coefficient of OH -through the oxide film was determined using cyclic voltammetry, chronoamperometry and electrochemical impedance spectroscopy techniques.

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Electrocatalytic properties of new active ternary ferrite film anodes for O2 evolution in alkaline medium

Cited by 90 publications

References 31 publications

Electrochemical behaviour of Fe x Co3−x O4 with (x = 0, 1, 2 and 3) oxides thin film electrodes in alkaline medium

Electrochemical behaviour of Fe x Co3−x O4 with (x = 0, 1, 2 and 3) oxides thin film electrodes in alkaline medium

The significance of electrochemical impedance spectra recorded during active oxygen evolution for oxide covered Ni, Co and Fe electrodes in alkaline solution

Cathodic behaviour of CoFe2O4 spinel electrodes in alkaline medium

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