Facile synthesis of three-dimensional NiCo<sub>2</sub>O<sub>4</sub> with different morphology for supercapacitors

Wang, Jinxing; Zhang, Yangyang; Ye, Junhua; Wang, Hongmei; Hao, Jinghua; Mu, Juyi; Zhao, Shuoqing; Hussain, Shahid

doi:10.1039/c6ra14242g

Cited by 85 publications

(49 citation statements)

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“…Different types of synthesis methods for transition-metal-based oxides have been developed including hydroxide decomposition [19], nanocasting [20], electrodeposition [21], coprecipitation [22], and hydrothermal synthesis [23]. However, their complex and energy-consuming processing hinders the industrial application to glucose sensors.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, exploring fast, environmentally friendly, and energy-efficient synthetic methods for transition-metal-based oxides is urgent. Recently, it has been reported that chemical bath synthesis has proven to be capable of controlling the size and morphology of materials by control of reaction parameters, such as temperature, pH, and solvent concentration [ 23 , 24 , 25 , 26 ]. It is expected that the transition-metal-based oxides prepared by chemical bath synthesis can be applied as a glucose sensor.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis of NiCo2O4 Nanostructures and Their Electrochemial Properties for Glucose Detection

et al. 2020

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In this work, we prepared spinel-type NiCo2O4 (NCO) nanopowders as a low-cost and sensitive electrochemical sensor for nonenzymatic glucose detection. A facile and simple chemical bath method to synthesize the NCO nanopowders is demonstrated. The effect of pH and annealing temperature on the formation mechanism of NCO nanoparticles was systematically investigated. Our studies show that different pHs of the precursor solution during synthesis result in different intermediate phases and relating chemical reactions for the formation of NCO nanoparticles. Different morphologies of the NCO depending on pHs are also discussed based on the mechanism of growth. Electrochemical performance of the prepared NCO was characterized towards glucose, which reveals that sensitivity and selectivity of the NCO are significantly related with the final microstructure combined with constituent species with multiple oxidation states in the spinel structure.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Synthesis of NiCo2O4 Nanostructures and Their Electrochemial Properties for Glucose Detection

et al. 2020

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“…These OH − ions then react with Ni +2 and Co +2 ions to form bimetallic hydroxide seed particles, as illustrated in the below equations. [ 64,65 ] These seed particles integrated themselves into the sheet‐like morphology as the methenamine surfactant encourages the radial growth, as shown in Figure 1c

\begin{matrix} {({CH}_{2})}_{6} {normalN}_{4} + 6 {normalH}_{2} O \to 6 HCHO + 4 {NH}_{3} \end{matrix}

\begin{matrix} {NH}_{3} + {normalH}_{2} O \to {NH}_{4}^{+} + {OH}^{-} \end{matrix}

\begin{matrix} 2 {Co}^{2 +} + {Ni}^{2 +} + 2 {OH}^{-} \to {NiCo}_{2} {(OH)}_{2} \end{matrix}

…”

Section: Resultsmentioning

confidence: 99%

Rational Design of Bimetallic Oxide Multi‐Nanoarchitectures for High‐Rate and Durable Hybrid Supercapacitors

Arbaz

Sekhar

Nagaraju

et al. 2020

Adv Materials Technologies

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the SCs, called as electrochemical capacitors, have been attracting considerable interest as promising charge storage devices because of their high power density, fast charging and discharging times, high cycling stability, and safe operation. [1,5-7] Consequently, SCs have been used in a wide range of fields such as flexible electronic devices, hybrid electrical vehicles, etc. [8,9] Depending on the internal charge storing mechanism, SCs are categorized as electric double-layer capacitors (EDLCs) and pseudocapacitors (PCs). [10] EDLCs store the charge electrostatically via a non-faradic process. [11] The porous activated carbon (PAC), carbon nanotubes, and carbon-derivatives exhibit EDLC-type behavior. [12-15] On the contrary, PCs store the charge in a faradaic manner, i.e., oxidation reaction and reduction reaction take place over the electrode surface. [16] Due to these redox reactions, the PCs exhibit higher capacitance than the EDLCs. Until now, MnO 2 , RuO 2 , and conducting polymers have been studied as PC-type materials. [17-22] Other transition metal hydroxides/oxides, such as NiO, Co 3 O 4 , NiCo layered double hydroxides, Ni 3 Se 2 , NiMoO 4 , NiCo 2 O 4 , etc., have been investigated because of the enriched active sites, multivalence states, and high theoretical capacitance. [23-36] Among the battery-type materials, the spinel nickel cobaltite or nickel-cobalt oxide (NCO) has been gaining intense attention due to its maximum theoretical capacitance, good electrical conductivity, two or more oxidation states, natural abundance, and low cost. [30-40] Moreover, the spinel NCO offers rich redox-active sites compared to the monometallic oxides such as nickel oxide and cobalt oxide due to the involvement of high redox-active nickel ions and cobalt ions. [41,42] Up to now, various NiCo 2 O 4 nanostructures have been fabricated using different methods. For instance, Meenaketan et al. designed NiCo 2 O 4 nanorods (NRs) using a solvothermal reaction and the authors obtained maximum specific capacitance of 233 F g −1 (1 A g −1). [43] Zhang et al. prepared NiCo 2 O 4 material with mesoporous hexagonallike morphology by using the rotary evaporation method. With the obtained porous morphology, the authors achieved a maximum capacitance of 568 F g −1 (1 A g −1). [44] In the next report, Kim et al. had come up with the NiCo 2 O 4 nanoplates via a hydrothermal method, and obtained morphology showed a Designing porous multi-nanoarchitectures can be advantageous to reduce the ion impregnation and enhance the electrokinetics in the active materials of electrochemical energy storage devices. Herein, the nickel cobaltite (NiCo 2 O 4) hybrid nanoarchitecture (NCO HNA) is prepared by using a facile wet-chemical method, followed by calcination. The effect of surfactants on the evolution of morphology is comprehensively investigated. The NCO HNA prepared with both the carbamide and methenamine as surfactants (NCO-C+M) demon strates 1D nanorods along with 2D hexagonal nanosheets. Owing to its advantageous structural features, t...

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“…The P‐Ni x Co 9‐x S 8 sample shows the smallest diameter, suggesting a low charge transfer resistance of P‐Ni x Co 9‐x S 8 . Besides, the P‐Ni x Co 9‐x S 8 has the most vertical line in the low frequency range, indicating the ideal capacitor behavior and the lowest electrolyte diffusion impedance The EIS spectra are fitted based on the equivalent circuit model in the inset of Figure , The R s and R ct of the P‐Ni x Co 9‐x S 8 and Ni x Co 9‐x S 8 is 0.77 Ω ⋅ cm −2 , 0.78 Ω ⋅ cm −2 and 0.87 Ω ⋅ cm −2 , 1.12 Ω ⋅ cm −2 .…”

Section: Resultsmentioning

confidence: 99%

One‐Step Solvothermal Synthesis of 3D Hierarchical Ni_xCo_9‐xS₈ Structures for High‐Performance Supercapacitors

et al. 2017

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Three‐dimensional flowerlike NixCo9‐xS8 nanosheets with polyvinyl pyrrolidone as the agent dictating the material morphology have been synthesized by means of a one‐step solvothermal synthesis procedure. The synthetically facile 3D NixCo9‐xS8 nanosheets (P‐NixCo9‐xS8) achieve high specific surface area and outstanding electrochemical performance. When applied as an electrode material, it demonstrates excellent specific capacitance of 1319.76 F g−1 at 1 A g−1, and good rate performance of 1040.4 F g−1 at 20 A g−1. Also, the material achieves remarkable cycling stability that still retains 93.7 % of max capacity after 1500 cycles at the high current density of 10 A g−1. Even after 4000 cycles, a maximum capacity of 71.2 % is retained. Additionally, the P‐NixCo9‐xS8//AC asymmetric supercapacitor (ASC) prepared exhibits excellent capacitive performance with a high specific capacitance (119.9 F g−1), high energy density (43.80 Wh kg−1 at 821.25 W kg−1) and high power density (30.30 Wh kg−1 at 15.58 kW kg−1).

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Facile synthesis of three-dimensional NiCo₂O₄ with different morphology for supercapacitors

Abstract: The morphology of NiCo2O4 can be controlled by changing the kinds of alkali source and the addition of NH4F, influencing its electrochemical properties.

Cited by 85 publications

References 44 publications

Synthesis of NiCo2O4 Nanostructures and Their Electrochemial Properties for Glucose Detection

Synthesis of NiCo2O4 Nanostructures and Their Electrochemial Properties for Glucose Detection

Rational Design of Bimetallic Oxide Multi‐Nanoarchitectures for High‐Rate and Durable Hybrid Supercapacitors

One‐Step Solvothermal Synthesis of 3D Hierarchical Ni_xCo_9‐xS₈ Structures for High‐Performance Supercapacitors

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Facile synthesis of three-dimensional NiCo2O4 with different morphology for supercapacitors

Abstract: The morphology of NiCo2O4 can be controlled by changing the kinds of alkali source and the addition of NH4F, influencing its electrochemical properties.

Cited by 85 publications

References 44 publications

Synthesis of NiCo2O4 Nanostructures and Their Electrochemial Properties for Glucose Detection

Synthesis of NiCo2O4 Nanostructures and Their Electrochemial Properties for Glucose Detection

Rational Design of Bimetallic Oxide Multi‐Nanoarchitectures for High‐Rate and Durable Hybrid Supercapacitors

One‐Step Solvothermal Synthesis of 3D Hierarchical NixCo9‐xS8 Structures for High‐Performance Supercapacitors

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Facile synthesis of three-dimensional NiCo₂O₄ with different morphology for supercapacitors

One‐Step Solvothermal Synthesis of 3D Hierarchical Ni_xCo_9‐xS₈ Structures for High‐Performance Supercapacitors