Effect of the partial replacement of Fe by Ni and/or Mn on the electrocatalytic activity for oxygen evolution of the CoFe2O4 spinel oxide electrode

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

“…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.…”

“…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.…”

Electrochemical oxidation of paraquat in neutral medium

“…In the last decade there was a successful development of low cost mixed oxide electrodes with high stability and relevant activity to pollution abatement. During the past years our efforts have been devoted to study mixed valence oxides with spinel structures, with focus on the search of novel electrode materials, for oxygen reactions [10][11][12]. Recent work has used successfully Fe-Co 3 O 4 thin film electrodes (Fe = 0%, 5% and 10%), for the electrooxidation of phenol in alkaline medium.…”

Synthesis and Characterization of Fucan-Coated Cobalt Ferrite Nanoparticles

“…The properties of these materials are so peculiar that they can be used in a large number of biotechnological applications, such as DNA and RNA purification, cell separation, drug delivery, magnetic resonance imaging [1], magnetic hyperthermia for cancer treatments [2], biosensors [3], etc. Several techniques, such as the sol-gel methods [4], citrate precursor techniques [5], electrochemical synthesis [6], combustion methods [7], solid state reaction [8], mechanical alloying [9], and the chemical precipitation, which is known as an economical way to produce fine powders [10,11] are used to produce ferrite nanoparticles. This paper reports on the synthesis of cobalt ferrite by an improved precipitation method, and the production of a nanoparticle coated with oleic acid and fucan polysaccharide.…”