A Comparative Study of Electrochemical Capacitive Behavior of NiFe2O4 Synthesized by Different Routes

Reduced graphite oxide-NiFe 2 O 4 (RGO-NiFe 2 O 4 ) composites were synthesized by adding different amounts of NH 3 $H 2 O into a mixed aqueous solution of graphite oxide, Ni(NO 3 ) 2 and Fe(NO 3 ) 3 at room temperature. NH 3 $H 2 O was used to adjust the synthesis system's pH value. The morphology and the microstructure of the as-prepared composites were characterized by X-ray diffraction (XRD), BrunauerEmmett-Teller (BET) and transmission electron microscope (TEM) techniques. The structure characterizations indicate that NiFe 2 O 4 successfully deposited on the surface of the RGO and the morphologies of RGO-NiFe 2 O 4 show a transparent structure with NiFe 2 O 4 homogeneously distributed on the RGO surfaces. Capacitive properties of the synthesized electrodes were studied using cyclic voltammetry and electrochemical impedance spectroscopy in a three-electrode experimental setup using 1 M Na 2 SO 4 aqueous solution as electrolyte. It is found that the pH value plays an important role in controlling the electrochemical properties of these electrodes. Among the synthesized electrodes, RGONiFe 10 (pH ¼ 10) shows the best capacitive properties because of its suitable particle size and good dispersion property. It could be anticipated that the synthesized electrodes will gain promising applications as novel electrode materials in supercapacitors and other devices by virtue of their outstanding characteristics of controllable capacitance and facile synthesis.

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“…These values are larger than those reported for NiFe 2 O 4 , 38 showing an enhanced capacitance behavior by introducing graphene.…”

Section: 41contrasting

confidence: 63%

Synthesis of graphene–NiFe2O4 nanocomposites and their electrochemical capacitive behavior

et al. 2013

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“…These MTMOs are emerging as promising electrode materials for both LIBs and ECs. [14,[19][20][21][22][23][24][25][26][27] There is thereby an urgent need but it is still a significant challenge to rationally design and delicately tailor the electroactive MTMOs for advanced LIBs, ECs, MOBs, and FCs. Furthermore, the presence of multiple valences of the cations in such spinel MTMOs systems is helpful to obtain the desirable electrochemical behavior of the electrocatalysts towards the oxygen reduction reaction (ORR) for high-performance MOBs and FCs by providing donor-acceptor chemisorption sites for the reversible adsorption of oxygen.…”

Section: Introductionmentioning

confidence: 99%

Mixed Transition‐Metal Oxides: Design, Synthesis, and Energy‐Related Applications

Yuan¹,

Wu²,

Xie³

et al. 2014

Angew Chem Int Ed

2,064

1,024

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A promising family of mixed transition-metal oxides (MTMOs) (designated as Ax B3-x O4 ; A, B=Co, Ni, Zn, Mn, Fe, etc.) with stoichiometric or even non-stoichiometric compositions, typically in a spinel structure, has recently attracted increasing research interest worldwide. Benefiting from their remarkable electrochemical properties, these MTMOs will play significant roles for low-cost and environmentally friendly energy storage/conversion technologies. In this Review, we summarize recent research advances in the rational design and efficient synthesis of MTMOs with controlled shapes, sizes, compositions, and micro-/nanostructures, along with their applications as electrode materials for lithium-ion batteries and electrochemical capacitors, and efficient electrocatalysts for the oxygen reduction reaction in metal-air batteries and fuel cells. Some future trends and prospects to further develop advanced MTMOs for next-generation electrochemical energy storage/conversion systems are also presented.

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“…[13][14][15][16][17][18][19] In particular, many efforts have been devoted on the design of specific morphologies such as nanorods, nanoflakes, nanosheets, and to the growth of hierarchical electrode architectures. However, there are other key factors that govern the final performance especially in supercapacitors, including the electrode material microstructure, particle morphologies, and surface properties (e.g.,s urface area, porosity).…”

Section: Introductionmentioning

confidence: 99%

Ultrathin Mesoporous RuCo₂O₄ Nanoflakes: An Advanced Electrode for High‐Performance Asymmetric Supercapacitors

et al. 2017

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A new ruthenium cobalt oxide (RuCo O ) with a unique marigold-like nanostructure and excellent performance as an advanced electrode material has been successfully prepared by a simple electrodeposition (potentiodynamic mode) method. The RuCo O marigolds consist of numerous clusters of ultrathin mesoporous nanoflakes, leaving a large interspace between them to provide numerous electrochemically active sites. Strikingly, this unique marigold-like nanostructure provided excellent electrochemical performance in terms of high energy-storage capacitance (1469 F g at 6 A g ) with excellent rate proficiency and long-lasting operating cycling stability (ca. 91.3 % capacitance retention after 3000 cycles), confirming that the mesoporous nanoflakes participate in the ultrafast electrochemical reactions. Furthermore, an asymmetric supercapacitor was assembled using RuCo O (positive electrode) and activated carbon (negative electrode) with aqueous KOH electrolyte. The asymmetric design allowed an upgraded potential range of 1.4 V, which further provided a good energy density of 32.6 Wh kg (1.1 mWh cm ). More importantly, the cell delivered an energy density of 12.4 Wh kg even at a maximum power density of 3.2 kW kg , which is noticeably superior to carbon-based symmetric systems.

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A Comparative Study of Electrochemical Capacitive Behavior of NiFe2O4 Synthesized by Different Routes

Cited by 94 publications

References 33 publications

Synthesis of graphene–NiFe2O4 nanocomposites and their electrochemical capacitive behavior

Synthesis of graphene–NiFe2O4 nanocomposites and their electrochemical capacitive behavior

Mixed Transition‐Metal Oxides: Design, Synthesis, and Energy‐Related Applications

Ultrathin Mesoporous RuCo₂O₄ Nanoflakes: An Advanced Electrode for High‐Performance Asymmetric Supercapacitors

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A Comparative Study of Electrochemical Capacitive Behavior of NiFe2O4 Synthesized by Different Routes

Cited by 94 publications

References 33 publications

Synthesis of graphene–NiFe2O4 nanocomposites and their electrochemical capacitive behavior

Synthesis of graphene–NiFe2O4 nanocomposites and their electrochemical capacitive behavior

Mixed Transition‐Metal Oxides: Design, Synthesis, and Energy‐Related Applications

Ultrathin Mesoporous RuCo2O4 Nanoflakes: An Advanced Electrode for High‐Performance Asymmetric Supercapacitors

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Ultrathin Mesoporous RuCo₂O₄ Nanoflakes: An Advanced Electrode for High‐Performance Asymmetric Supercapacitors