Structure, magnetic behavior and OER activity of CoFe2O4 powders obtained using agar-agar from red seaweed (Rhodophyta)

Ferreira, Luciena S.; Silva, Thayse R.; Santos, Jakeline Raiane D.; Silva, Vinícius D.; Raimundo, Rafael A.; Morales, Marco A.; Macedo, Daniel A.

doi:10.1016/j.matchemphys.2019.121847

Cited by 48 publications

(19 citation statements)

References 65 publications

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“…It can be seen that with an increase in voltage, impedance decreases and becomes closer to 8 U from 60 U, which depicts the good electrochemical performance of the electrode material. 63,98 The active functioning of PdO-2Mn 2 O 3 as a more efficient electro-catalyst for the OER is mainly due two reasons: the introduction of PdOx with Mn 2 O 3 which produces a synergic effect on the overall efficiency of the electrode material and, secondly, the organic phytocompounds or carbon-containing capping agents used in the synthesis of the oxides which has been conrmed by XPS and GC-MS analysis (C 10 H 20 O 2 ). By introducing any dopant, activity could be enhanced by providing more active sites and charge carriers.…”

Section: Electrochemical Characterizationmentioning

confidence: 99%

Phyto-inspired and scalable approach for the synthesis of PdO–2Mn₂O₃: a nano-material for application in water splitting electro-catalysis

et al. 2020

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Section: Electrochemical Characterizationmentioning

confidence: 99%

Phyto-inspired and scalable approach for the synthesis of PdO–2Mn₂O₃: a nano-material for application in water splitting electro-catalysis

et al. 2020

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“…Generally, spinel mixed metal oxides with formula AB 2 O 4 (A, B = metal) exhibit higher electrochemical activity than the single-metal oxides. This is because of the electron jump among different valence states of ions in octahedral sites and additional metallic redoxactive centres [11][12][13][14][15][16]. Between various spinel oxides, Fe-based spinels, e.g., CuFe 2 O 4 , NiFe 2 O 4 , and CoFe 2 O 4 , have been reported as promising electrocatalysts for OER [17].…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterisation of Cobalt Ferrite Coatings for Oxygen Evolution Reaction

Kubisztal

2021

Catalysts

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In this paper, two novel procedures based on powder sedimentation, thermal treatment, and galvanostatic deposition were proposed for the preparation of porous cobalt ferrite (CoFe2O4) coatings with a metallic and organic binder for use as catalysts in the oxygen evolution reaction (OER). The electrochemical properties of the obtained electrode materials were determined as well, using both dc and ac methods. It was found that cobalt ferrite coatings show excellent electrocatalytic properties towards the oxygen evolution reaction (OER) with overpotential measured at a current density of 10 mAcm−2 from 287 to 295 mV and a Tafel slope of 35–45 mVdec−1. It was shown that the increase in the apparent activity of the CoFe2O4 coatings with an organic binder results mainly from a large electrochemically active area. Incorporation of the nickel binder between the CoFe2O4 particles causes an increase in both the conductivity and the electrochemically active area. The Tafel slopes indicate that the same rate-determining step controls the OER for all obtained coatings. Furthermore, it was shown that the CoFe2O4 electrodes exhibit no significant activity decrease after 28 h of oxygen evolution. The proposed coating preparation procedures open a new path to develop high-performance OER electrocatalysts.

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“…In this way, the microstructure of the electrode obtained at pH 9 acts as channels favoring the wettability of the electrode by the electrolyte. 68 It ensures that more intermediate species (OH − ) reach as many active sites as possible. 69 Besides, despite the proximity between the ESR values of the electrodes (Figure 8D), their morphological characteristics (particle size, agglomeration, and porosity) play a vital role on limiting their electrical conductivities, once grain boundary density acts as spreaders of charge carriers.…”

Section: Electrochemical Characterizationmentioning

confidence: 99%

Effects of morphology on the electrochemical performance of NiFe₂O₄nanoparticles with battery‐type behavior

Silva

Raimundo

Ferreira

et al. 2022

Int J Applied Ceramic Tech

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We report the synthesis of NiFe2O4 nanoparticles by the complexation EDTA‐citrate method under acidic (pH = 3) and basic (pH = 9) conditions. The structural, optical, vibrational, magnetic, and electrochemical properties were studied. The samples have crystallite sizes of 21 nm (pH 3) and 73 nm (pH 9), with rounded particles and layered structures. The 57Fe Mössbauer spectra at 12 K showed that both samples had an inverse spinel cation distribution. At 5 K, the sample prepared at pH 9 showed saturation magnetizations of about 50 emu/g. Raman spectra showed typical bands of NiFe2O4 phase. The materials were tested as electrodes under alkaline condition. The cyclic voltammetry and charge‐discharge experiments indicated a battery‐type behavior, with maximun capacities of 65 and 5 C/g (at specific currents of 3 and 10 A/g) for samples prepared at pH 9 and 3, respectively. This work offers a route for obtaining NiFe2O4 nanoparticles with different morphologies and sizes tuned by the synthesis conditions.

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Structure, magnetic behavior and OER activity of CoFe2O4 powders obtained using agar-agar from red seaweed (Rhodophyta)

Cited by 48 publications

References 65 publications

Phyto-inspired and scalable approach for the synthesis of PdO–2Mn₂O₃: a nano-material for application in water splitting electro-catalysis

Phyto-inspired and scalable approach for the synthesis of PdO–2Mn₂O₃: a nano-material for application in water splitting electro-catalysis

Synthesis and Characterisation of Cobalt Ferrite Coatings for Oxygen Evolution Reaction

Effects of morphology on the electrochemical performance of NiFe₂O₄nanoparticles with battery‐type behavior

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Structure, magnetic behavior and OER activity of CoFe2O4 powders obtained using agar-agar from red seaweed (Rhodophyta)

Cited by 48 publications

References 65 publications

Phyto-inspired and scalable approach for the synthesis of PdO–2Mn2O3: a nano-material for application in water splitting electro-catalysis

Phyto-inspired and scalable approach for the synthesis of PdO–2Mn2O3: a nano-material for application in water splitting electro-catalysis

Synthesis and Characterisation of Cobalt Ferrite Coatings for Oxygen Evolution Reaction

Effects of morphology on the electrochemical performance of NiFe2O4nanoparticles with battery‐type behavior

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Product

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Phyto-inspired and scalable approach for the synthesis of PdO–2Mn₂O₃: a nano-material for application in water splitting electro-catalysis

Phyto-inspired and scalable approach for the synthesis of PdO–2Mn₂O₃: a nano-material for application in water splitting electro-catalysis

Effects of morphology on the electrochemical performance of NiFe₂O₄nanoparticles with battery‐type behavior