Cathodic behaviour of CoFe2O4 spinel electrodes in alkaline medium

Laouini, E.; Douch, J.; Hamdani, Mohamed; Berghoute, Y.; Mendonça, M.H.; Pereira, M.I.S.; Singh, R.N.

doi:10.1007/s10800-011-0289-9

Cited by 10 publications

(6 citation statements)

References 38 publications

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“…Through painting or brushing metal nitrates onto inactive substrate such as Ti, Ni, fluorine-doped tin oxide (FTO), and stainless foam, spinel composites can be formed on functional substrates. ,− Impregnating the metal nitrates into porous carbon and (La,Sr)MnO 3 -yttria with good dispersion results in spinel oxides in porous frameworks. − Additionally, nanocasting technology with soft or hard templates such as silica xerogel and metal nitrates as raw material is used to prepare porous spinel nanoparticles. ,− Their specific surface areas are up to 250 m 2 g –1 (Mg-substituted Co 3 O 4 ) . In the example of the fabrication of Mn 3 O 4 /CMK-3 nanohybrids, mesoporous CMK-3 was first dispersed in a mixed solution of H 2 O and ethanol containing the Mn(NO) 3 .…”

Section: Preparationmentioning

confidence: 99%

Spinels: Controlled Preparation, Oxygen Reduction/Evolution Reaction Application, and Beyond

et al. 2017

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Spinels with the formula of ABO (where A and B are metal ions) and the properties of magnetism, optics, electricity, and catalysis have taken significant roles in applications of data storage, biotechnology, electronics, laser, sensor, conversion reaction, and energy storage/conversion, which largely depend on their precise structures and compositions. In this review, various spinels with controlled preparations and their applications in oxygen reduction/evolution reaction (ORR/OER) and beyond are summarized. First, the composition and structure of spinels are introduced. Then, recent advances in the preparation of spinels with solid-, solution-, and vapor-phase methods are summarized, and new methods are particularly highlighted. The physicochemical characteristics of spinels such as their compositions, structures, morphologies, defects, and substrates have been rationally regulated through various approaches. This regulation can yield spinels with improved ORR/OER catalytic activities, which can further accelerate the speed, prolong the life, and narrow the polarization of fuel cells, metal-air batteries, and water splitting devices. Finally, the magnetic, optical, electrical, and catalytic applications beyond the OER/ORR are also discussed. The future applications of spinels are considered to be closely related to environmental and energy issues, which will be aided by the development of new species with precise preparations and advanced characterizations.

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Section: Preparationmentioning

confidence: 99%

Spinels: Controlled Preparation, Oxygen Reduction/Evolution Reaction Application, and Beyond

et al. 2017

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“…23,24 The oxygen evolution reaction (OER) attracts a reasonable deal of attention as a consequence of its importance * Author for correspondence (j.raoof@umz.ac.ir) in a wide range of industrial applications, such as water electrolysis, energy conversion and storage devices. [25][26][27][28][29][30] There is an extensive work in the literature addressing the development and characterization of suitable anodic materials for the applications in water electrolysis and batteries technology. [31][32][33] As alternative to precious metals, metal oxide-based electrodes, particularly Ni and Co oxides, have long been used as electrocatalysts for the OER in alkaline electrolyzers due to their great stability and high activity.…”

Section: Introductionmentioning

confidence: 99%

Cobalt oxide nanoparticle-modified carbon nanotubes as an electrocatalysts for electrocatalytic evolution of oxygen gas

Raoof

Ehsani

2015

Bull Mater Sci

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A simple procedure was developed to prepare cobalt oxide nanoparticles (nano-CoO x) on multiwall carbon nanotube-modified glassy carbon electrode (MWNT/GCE). Scanning electron microscopy revealed the electrodeposition of nano-CoO x with an average particle size of 25 nm onto MWNT/GCE. Also, the presence of nano-CoO x was revealed by energy dispersive X-ray spectra. The electrocatalytic activity of nano-CoO x and MWNT composite-modified GCE (CoO x-MWNT/GCE) has been examined towards the oxygen evolution reaction (OER) by linear sweep voltammetry. The OER is significantly enhanced at CoO x-MWNT/GCE, as demonstrated by a negative shift in the polarization curves at the CoO x-MWNT/GCE compared with that obtained at the CoO x-GCE and GCE. Optimization of the operating experimental conditions (i.e., solution pH and loading level of nano-CoO x) has been achieved to maximize the electrocatalytic activity of CoO x-MWNT/GCE. The maximum electrocatalytic activity towards the OER was obtained in alkaline media (pH = 13). The electrocatalytic activity of CoO x-MWNT/GCE increased with the number of potential cycles employed for the CoO x deposition till a certain loading (20 cycles) beyond which an adverse effect is observed. The fabricated CoO x-MWNT/GCE exhibited a good stability and durability. The value of energy saving per gram of oxygen gas at a current density of 10 mA cm −2 is 19.3 kWh kg −1 .

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“…In Figure 3, the redox behaviors of sonicated NP (a), sonicated NP-NH 2 (b) and APTMS (c) are compared. The NP in DMSO solution undergoes a not-well-defined reduction process at E pc = −1.17 V that seems to be an overlapping of several processes; the cathodic potential value and the shape of this peak correspond closely to those found for iron ion reductions in CoFe 2 O 4 spinel electrodes [19,20]. .…”

Section: Functionalized Nanoparticles (Np-nh 2 )mentioning

confidence: 62%

Hybrid Magnetic Hydrogel: A Potential System for Controlled Drug Delivery by Means of Alternating Magnetic Fields

Giani¹,

Fedi²,

Barbucci³

2012

Polymers

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Abstract:Novel hybrid magnetic hydrogels have demonstrated their influence in several areas, particularly in biomedical science where these innovative materials are showing interesting applications for controlled drug delivery. A hybrid hydrogel with CoFe 2 O 4 nanoparticles (NPs) as cross-linker agents of carboxymethylcellulose (CMC) polymer was obtained with the aim of testing it as a system for controlled drug release. The NPs were functionalized with (3-aminopropyl)-trimethoxysilane (APTMS) in order to introduce-NH 2 groups on the surface. Infrared spectroscopy, XPS and electrochemical analysis were performed to quantify the amino coating. The presence of magnetic nanoparticles makes the system suitable for an application with magnetic stimulus. Preliminary studies performed with alternating magnetic fields indicate a release of the drug-like molecules previously loaded in the matrix.

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Cathodic behaviour of CoFe2O4 spinel electrodes in alkaline medium

Cited by 10 publications

References 38 publications

Spinels: Controlled Preparation, Oxygen Reduction/Evolution Reaction Application, and Beyond

Spinels: Controlled Preparation, Oxygen Reduction/Evolution Reaction Application, and Beyond

Cobalt oxide nanoparticle-modified carbon nanotubes as an electrocatalysts for electrocatalytic evolution of oxygen gas

Hybrid Magnetic Hydrogel: A Potential System for Controlled Drug Delivery by Means of Alternating Magnetic Fields

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