Preparation and electrochemical characterization of spinel type Fe–Co3O4 thin film electrodes in alkaline medium

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

doi:10.1016/j.ijhydene.2008.07.039

Cited by 54 publications

(35 citation statements)

References 36 publications

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“…In a recent study, we reported that E OC of Fe-Co 3 O 4 (with 0, 5 and 10% of Fe) was 0.000 ± 0.005 V vs. SCE regardless the oxide composition [11]. This result showed electrodes do not exhibit any current peak prior to the oxygen evolution but a slight increase in the background current is observed followed by a weak shoulder that overlaps the current due to oxygen evolution.…”

Section: Open-circuit Potentialmentioning

confidence: 81%

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: Open-circuit Potentialmentioning

confidence: 81%

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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“…The competition between the tetrahedral (A) and octahedral (B) coordinate cations in the spinel structure (AB 2 O 4 ) can also be responsible for the different intensity ratios observed for the doped samples. 21 Mn-doping decreases the crystallinity but Fe-doping increases the crystallinity. Slight shift in the peak position of doped samples is observed, which is due to the variation in the lattice constants.…”

Section: A Xrd Analysismentioning

confidence: 94%

Structural, optical, and magnetic properties of Mn and Fe-doped Co3O4 nanoparticles

2015

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Mn and Fe-doped Co3O4 nanoparticles were prepared by a simple precipitation method. The synthesized particles were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM), UV-Vis absorption spectroscopy, Fourier transform infrared spectroscopy (FTIR), Raman spectroscopy, and vibrating sample magnetometer (VSM) techniques. XRD analysis showed the cubic structure of Co3O4. SEM and TEM images confirmed the formation of interconnected nanoparticles. Mn and Fe-doped Co3O4 showed broad absorption in the visible region compared to undoped sample and the band gap values are red shifted. Five Raman active modes were observed from the Raman spectra. FTIR spectra confirmed the spinel structure of Co3O4 and the doping of Mn and Fe shifts the vibrational modes to lower wave number region. The magnetic measurements confirmed that Fe-doped Co3O4 shows a little ferromagnetic behavior compared to undoped and Mn-doped Co3O4, which could be related to the uncompensated surface spins and the finite size effects.

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“…Furthermore, these composites can provide better performances as compared with monometallic counterparts for OER . However, numerous experimental and computational studies have confirmed the fact that these TMOs and associated metal‐dopants are vital for OER catalysts, factors such as the role of the secondary metal (i.e., Fe) in catalysis remain unclear in which researchers have yet to determine whether these secondary metals activate the catalyst sites or whether they are the “active sites.” Here, several studies have reported that Fe is an active site for OER whereas other studies have reported that the role of Fe is to improve the conductivity of the electrode or that Fe acts as an electron promoter to enable high catalytic activities.…”

Section: Advancements Of Tm‐based Electrocatalystsmentioning

confidence: 99%

A review of transition metal‐based bifunctional oxygen electrocatalysts

Ibrahim

Tsai

Chala

et al. 2019

J Chinese Chemical Soc

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Electrochemical energy storage and conversion devices play a key role in the development of clean, sustainable, and efficient energy systems to meet the sustainable growth of our society. However, challenging issues including the sluggish kinetics of oxygen electrode reactions involving the oxygen reduction reaction (ORR) and the oxygen evolution reaction (OER) are present, limiting the implementation of devices such as metal‐air batteries, water electrolyzers, and regenerative fuel cells. In this review, various monometallic and bimetallic transition metal oxides (TMOs) and hydroxides are summarized in terms of their application for ORR/OER, in which the merits and demerits of various precious metal and carbon‐based metal oxide materials are discussed, with requirements for better electrocatalysts and catalyst support being introduced as well. Following this, different approaches to improve catalytic activity such as the introduction of doping and defects, the manipulation of crystal facets, and the engineering of supports, compositions, and morphologies are summarized in which TMOs with improved ORR/OER catalytic activities can be synthesized, further improving the speed, stability, and polarization of electrochemical energy storage and conversion devices. Finally, perspectives into the improvement of performance and the better understanding of ORR/OER mechanisms for bifunctional electrocatalysts using in situ spectroscopic techniques and density functional theory calculations are also discussed.

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Preparation and electrochemical characterization of spinel type Fe–Co3O4 thin film electrodes in alkaline medium

Cited by 54 publications

References 36 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

Structural, optical, and magnetic properties of Mn and Fe-doped Co3O4 nanoparticles

A review of transition metal‐based bifunctional oxygen electrocatalysts

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