Studies on Fe–Co spinel electrodes

Cartaxo, M.A.M.; Ferreira, Teresa; Nunes, M. R.; Mendonça, M.H.; Pereira, M. I. da Silva; Costa, F.M.

doi:10.1016/j.solidstatesciences.2007.05.001

Cited by 16 publications

(13 citation statements)

References 39 publications

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“…After the electrochemical studies, the presence of the spinel structure was observed for all the analysed samples, which led us to conclude that the stability of the spinel oxides was acceptable. [9]. Silva et al [10] have shown that the presence of iron oxide in cobalt oxide coatings, on cold-rolled steel films, tends to lower the electrode potential in Na 2 SO 4 , pH 13.…”

Section: Resultsmentioning

confidence: 99%

“…Studies for FeCo 2 O 4 oxides in 1 M KOH, reported by Cartaxo et al [9], have assigned these peaks to either Fe 3 O 4 Á 4H 2 O/ Fe(OH) 2 or Fe 3 O 4 /Fe 2 O 3 redox couple. Our results are in good agreement with those reported by Vago and Calvo [21] for Fe 3 O 4 -PVC composite in 1 M NaOH, and by Allen et al [22] for magnetite ?…”

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

confidence: 98%

“…These studies show that the solid-state surface redox transitions (SSSRT), which take place on electrode surfaces, play a crucial role in their activity. A study on the SSSRT on FeCo 2 O 4 pelleted electrodes has recently been published by some authors [9]. The results obtained and the few publications on the electrochemical behaviour of FeCo 2 O 4 and CoFe 2 O 4 oxides led us to study these oxides as thin films.…”

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: Resultsmentioning

confidence: 99%

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

confidence: 98%

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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“…Different methods, such as electrochemical deposition [7,8], thermal decomposition [9], precipitation [5,6,10], sol-gel [3,11,12], and spray pyrolysis [13], have been used to prepare CoFe 2 O 4 . Recently, CoFe 2 O 4 nanoparticles were prepared by co-precipitation of ferric and cobaltous ions with sodium hydroxide [14] and also by spraying co-precipitation [15].…”

Section: Introductionmentioning

confidence: 99%

“…Godinho et al [16] studied the effect of the partial replacement of Fe by Ni and/or Mn on the electrocatalytic activity of the Fe/CoFe 2 O 4 thin film oxide electrode for the OER. The same group studied, also, the solid-state surface redox transitions on FeCo 2 O 4 pelleted electrode [10]. On the other hand, with the aim to improve its electrocatalytic activity towards the OER, the influence of the partial substitution of Fe by Cr in the CoFe 2 O 4 was also investigated [5].…”

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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Advances in Electrochemical and Catalytic Performance of Nanostructured FeCo₂O₄ and Its Composites

Shetgaonkar

Salkar

Morajkar

2021

Chemistry An Asian Journal

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It is well established that the excessive and uncontrolled use of fossil fuels and organic chemicals have put a risk to the earth‘s environment and the life that sustains within it. Carbon‐free, sustainable, alternative energy technologies have therefore become the prime focus of current research. Smart inorganic materials have emerged as the potential solution to suffice energy needs and remediate the organic pollutants discharged to the environment. One such promising, versatile material is FeCo2O4 which has gained immense research interest in the present decade due to its high efficiency and performance in energy and environmental applications. Innovative material design strategies involving the interplay of nanostructured morphology, chemical composition, redox surface states, and defect engineering have significantly enhanced both electrochemical and catalytic properties of FeCo2O4. Therefore, this review article aims to provide the first‐ever comprehensive account of the latest research and developments in design‐synthesis strategies, characterization techniques, and applications of nanostructured FeCo2O4 and its composites in various electrochemical as well as catalytic applications. A detailed account of the nanostructured FeCo2O4 and its composites in various energy storage and conversion devices such as supercapacitors (SCs), batteries, and fuel cells has been presented. Furthermore, a special section has been devoted to highlight the role of FeCo2O4 in enhancing the sluggish reaction kinetics of oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) in water splitting application. This review also highlights the role of nanostructured FeCo2O4 in photocatalytic waste water treatment, gas sensing, and dual‐phase membrane technologies wherein FeCo2O4 has demonstrated promising performance.

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Studies on Fe–Co spinel electrodes

Cited by 16 publications

References 39 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

Cathodic behaviour of CoFe2O4 spinel electrodes in alkaline medium

Advances in Electrochemical and Catalytic Performance of Nanostructured FeCo₂O₄ and Its Composites

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Studies on Fe–Co spinel electrodes

Cited by 16 publications

References 39 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

Cathodic behaviour of CoFe2O4 spinel electrodes in alkaline medium

Advances in Electrochemical and Catalytic Performance of Nanostructured FeCo2O4 and Its Composites

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Advances in Electrochemical and Catalytic Performance of Nanostructured FeCo₂O₄ and Its Composites