Influence of temperature on the preparation of CoFe2O4 by the sol-gel method and its application in electrochemical energy storage

Silva, E. C.; Costa, João Carlos Martins da; Nascimento, M. C.; Pereira, B. L.; Passos, Raimundo R.; Pocrifka, Leandro A.

doi:10.1007/s10008-020-04616-z

Cited by 6 publications

(2 citation statements)

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“…This is due to their increased electroactive sites which offer appropriate conductive pathways and extensive nanopaths to promote efficient transportation of charges/ionic species 2 , 8 – 10 . During the past decade, spinel TMOs of the AB 2 O 4 structure (A and B represent metal elements at tetrahedral and octahedral sites, respectively ) of CuFe 2 O 4 2 , MnFe 2 O 4 4 , NiFe 2 O 4 3 , 6 , CoFe 2 O 4 1 , 6 , 7 , 9 and ZnFe 2 O 4 10 – 15 were extensively studied as electrode materials for PCs. This is due to their advantage of a polymorphic structure of normal, inverse and mixed spinel forms in which metal ions with a + 2 oxidation state (M 2+ ) and (Fe 2+ /Fe 3+ ) can be distributed at A or/and B sites.…”

Section: Introductionmentioning

confidence: 99%

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electrodes with high electrochemical performance. This is due to their increased electroactive sites which offer appropriate conductive pathways and extensive nanopaths to promote efficient transportation of charges/ionic species 2,[8][9][10] . During the past decade, spinel TMOs of the AB 2 O 4 structure (A and B represent metal elements at tetrahedral and octahedral sites, respectively ) of CuFe 2 O 4 2 , MnFe 2 O 4 4 , NiFe 2 O 4 3,6 , CoFe 2 O 4 1,6,7,9 and ZnFe 2 O 4 10-15were extensively studied as electrode materials for PCs.

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confidence: 99%

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Influence of Co doping on phase, structure and electrochemical properties of hydrothermally obtained CoxZn1−xFe2O4 (x = 0.0–0.4) nanoparticles

Putjuso

Karaphun

et al. 2023

Sci Rep

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In this work, CoxZn1−xFe2O4 (x = 0.0–0.4) nanoparticles (NPs) were successfully synthesized by a hydrothermal method at 200 °C for 12 h. X-ray diffraction revealed a pure cubic spinel phase of all samples with space group Fd-3m. Fourier transform infrared spectrometry disclosed the vibrational modes of metal oxides in the spinel structure. Scanning electron microscopy and transmission electron microscopy disclosed a uniform distribution of cuboidal shape NPs with a decreased average NPs size from 22.72 ± 0.62 to 20.85 ± 0.47 nm as the Co content increased. X-ray absorption near edge spectroscopy results confirmed the presence of Zn2+, Co2+ and Fe2+/Fe3+ in Co-doped samples. The pore volume, pore size and specific surface area were determined using N2 gas adsorption/desorption isotherms by the Brunauer–Emmett–Teller (BET) and Barrett–Joyner–Halenda (BJH) techniques. Electrochemical properties of supercapacitors, having active CoxZn1−xFe2O4 (x = 0.0–0.4) NPs as working electrodes, indicated pseudo-capacitor performance related to the Faradaic redox reaction. Interestingly, the highest specific capacitance (Csc), 855.33 F/g at 1 A/g, with a capacity retention of 90.41% after 1000 GCD cycle testing was achieved in the Co0.3Zn0.7Fe2O4 electrode.

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