Mixed metal oxides in synergy at nanoscale: Electrospray induced porosity of in situ grown film electrode for use in electrochemical capacitor

Chavhan, Madhav P.; Sethi, Smruti Ranjan; Ganguly, Suvankar

doi:10.1016/j.electacta.2020.136277

Cited by 16 publications

(2 citation statements)

References 56 publications

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“…Generally, for a capacitive surface, the value of α varies from 0.6 to 1 [64] . α was found to be 0.73 for SP‐HEO‐550 which is higher than the values reported for binary and unary oxides [65] This indicated a tendency of the SP‐HEO towards more ideal charge storage. The linear spike at the low‐frequency region representing the Warburg impedance (W) of the electrode, attributed to the diffusion of OH − ion into the electrode during redox reaction, is a characteristic behaviour of supercapacitors.…”

Section: Resultsmentioning

confidence: 81%

Structural and Electrochemical Investigations on Nanocrystalline High Entropy Spinel Oxides for Battery‐Like Supercapacitor Applications

et al. 2022

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High entropy oxides (HEOs) are a novel class of materials with a stable single‐phase structure that is often entropy stabilized and possess many interesting functional properties. In this work, we report a nanocrystalline spinel‐based high entropy oxide (SP‐HEO) ‐ (Al0.2Co0.2Cr0.2Mn0.2Ni0.2)3O4 and present an assessment of its electrochemical performance. A reverse co‐precipitation (RCP) method was used for synthesis, followed by a suitable heat‐treatment/calcination step that was adjusted to form a single‐phase nanocrystalline powder. Structural characterisation revealed that the single‐phase system was stable upto 850 °C. Nitrogen adsorption studies showed a large specific surface area of 90 m2 g−1 in the case of the SP‐HEO calcined at 550 °C. The SP‐HEO powders were investigated as electrodes for battery‐like supercapacitor behaviour in an aqueous alkaline electrolyte ‐ KOH. The SP‐HEO powder calcined at 550 °C exhibited the highest specific capacity of 318 mAh g−1 at a current density of 1 A g−1. The high electrochemical performance of the mesoporous SP‐HEO makes it a promising electrode material for energy storage devices.

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Section: Resultsmentioning

confidence: 81%

Structural and Electrochemical Investigations on Nanocrystalline High Entropy Spinel Oxides for Battery‐Like Supercapacitor Applications

et al. 2022

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“…Mixed cobalt nickel oxides (CoNiO) have received renewed interest in the past years [1]. Non-stoichiometric CoNiO and stoichiometric NiCo 2 O 4 are of interest for many applications, e.g., as batteries [2][3][4][5][6], supercapacitors [7,8], battery supercapacitor hybrids [9], sensors [10], solar cells [11], and catalysts [12][13][14][15][16]. Here, we are guided by an interest in the crystallographic and optical properties of deposited CoNiO films with varying Co/Ni ratios.…”

Section: Introductionmentioning

confidence: 99%

Crystalline Structure and Optical Properties of Cobalt Nickel Oxide Thin Films Deposited with a Pulsed Hollow-Cathode Discharge in an Ar+O2 Gas Mixture

Kapran,

Hippler,

Wulff

et al. 2024

Coatings

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Cobalt nickel oxide films are deposited on Si(111) or fluorine-doped tin-oxide-coated (FTO) glass substrates employing a pulsed hollow-cathode discharge. The hollow cathode is operated with argon gas flowing through the nozzle and with O2 gas admitted to the vacuum chamber. Three different cathode compositions (Co20Ni80, Co50Ni50, and Co80Ni20) are investigated. Deposited and annealed thin films are characterized by X-ray diffraction, infrared (Raman) spectroscopy, and ellipsometry. As-deposited films consist of a single mixed cobalt nickel oxide phase. Upon annealing at 600 °C, the mixed cobalt nickel oxide phase separates into two cystalline sub-phases which consist of cubic NiO and cubic Co3O4. Annealed films are investigated by spectroscopic ellipsometry and the optical bandgaps are determined.

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In‐Situ Growth of 2D to 3D NiO on Nickel Foam with Enhanced Capacity Retention as Battery‐Type Electrode for Asymmetric Supercapacitor

Wihdatul Himmah,

Wulan Septiani,

Wustoni

et al. 2024

ChemNanoMat

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This work presents a systematic study to synthesize NiO on nickel foam (NF) using a straightforward and cost‐efficient hydrothermal method, followed by calcination. Through comprehensive physicochemical analyses, it was demonstrated that the properties of the resultant NF@NiO could be modulated by adjusting the concentration of the nickel nitrate hexahydrate precursor. Notably, a morphological transition from a 2D sheet‐like structure to a 3D rambutan‐like formation was observed as the precursor concentration increased. The best‐performing NF@NiO 4 mM showed a maximum areal capacity of 723 mC cm‐2 (equivalent to 547.73 F g‐1) at a current density of 0.5 mA cm‐2. This electrode also maintained remarkable cycle stability, retaining 78.9% of its capacitance after 10,000 cycles at a current density of 50 mA cm‐2 in 2 M KOH. Furthermore, ASC (NiO 4 mM//AC) achieved a specific capacitance of 64.79 F g‐1 at a current density of 1 A g‐1 with an energy density of 17.63 Wh kg‐1 at a power density of 700 W kg‐1.

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Mixed metal oxides in synergy at nanoscale: Electrospray induced porosity of in situ grown film electrode for use in electrochemical capacitor

Cited by 16 publications

References 56 publications

Structural and Electrochemical Investigations on Nanocrystalline High Entropy Spinel Oxides for Battery‐Like Supercapacitor Applications

Structural and Electrochemical Investigations on Nanocrystalline High Entropy Spinel Oxides for Battery‐Like Supercapacitor Applications

Crystalline Structure and Optical Properties of Cobalt Nickel Oxide Thin Films Deposited with a Pulsed Hollow-Cathode Discharge in an Ar+O2 Gas Mixture

In‐Situ Growth of 2D to 3D NiO on Nickel Foam with Enhanced Capacity Retention as Battery‐Type Electrode for Asymmetric Supercapacitor

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