Designed synthesis of nickel–cobalt-based electrode materials for high-performance solid-state hybrid supercapacitors

traditional battery systems. [10,11] Practically, lower energy density bounds the applicability of supercapacitors over battery systems, leaving more room in developing high energy density supercapacitors without having to compromise the power competence. [12-14] A well-known approach offering such outstanding energy density is via fabrication of asymmetric supercapacitor device that focusses on the positive materials excellency exhibiting high specific capacitance and providing a broad potential window when combined with a double-layer type negative electrode material. [15-17] Co 3 O 4 , a pseudocapacitive metal oxide, belonging to the family of spinel is a promising positive active material in electrochemical energy storage devices owing to its high specific capacitance (3560 F g −1) theoretically with being earthabundant, cost-effective, and also environment friendly. [18-20] Pseudocapacitors follow faradaic redox electrochemical reactions on the material's surface through continuous intercalation/deintercalation of electrons or ions which makes the surface vulnerable to destruction resulting in lower efficiency of the electroactive material affecting the electrochemical cycles. [21-23] Therefore, much effort has been put forward to increase the efficiency and stability of the Co 3 O 4 structures through nanostructured, [18] heterostructured, [24,25] and core-shell type structures [26] to reduce the structural deterioration from Co 3 O 4 and increase the overall specific capacitances. For instance, a 3D hierarchical structure of CoWO 4 /Co 3 O 4 was developed that exhibited significantly high specific capacitance of 1728 F g −1 at a current density of 1 A g −1 retaining about 85.9% specific capacitance after 5000 cycles. [27] Paliwal and Meher design a heterostructure of Co 3 O 4 /NiCo 2 O 4 perforated nanosheets that delivers specific capacitance of 1767 F g −1 at a current density of 0.5 A g −1 maintaining 552 F g −1 capacitance at high current density 16 A g −1. Additionally, the asymmetric device composed of Co 3 O 4 /NiCo 2 O 4 ||N-rGO retains 93.8% areal capacitance after 10 000 operating cycles. [28] An excellent core-shell type CoO@Co 3 O 4 nanocrystals were grown solvothermally which delivered 3377 F g −1 specific capacitance at current density 2 A g −1 and the capacity retention was about 58.6% after 4000 charge-discharge cycles. [29] Lu et al. reported Co 3 O 4 /CoS core-shell nanosheets grown over Ni-foam by room temperature sulfurization process. The structure showed an improved specific capacitance as high as 1658 F g −1 at 1 A g −1 Designing of multicomponent transition metal oxide system through the employment of advanced atomic layer deposition (ALD) technique over nanostructures obtained from wet chemical process is a novel approach to construct rational supercapacitor electrodes. Following the strategy, core-shell type NiO/Co 3 O 4 nanocone array structures are architectured over Ni-foam (NF) substrate. The high-aspect-ratio Co 3 O 4 nanocones are hydrothermally grown over NF following the p...

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“…[ 7 ] : Co 3 O 4 @CoMoO 4 NPF; [ 24 ] Ref. [ 8 ] :CoNi 2 S 4 HSC; [ 55 ] and Ref. [ 9 ] : CoNi‐LDH@PCPs.…”

Section: Resultsmentioning

confidence: 99%

Encapsulation of Co₃O₄ Nanocone Arrays via Ultrathin NiO for Superior Performance Asymmetric Supercapacitors

Adhikari

Seenivasan

et al. 2020

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“…Among the TMOs, the Co and Ni oxides have shown high electrochemical activities. 28,29 They can form many different nanostructures providing large surface area, which is significant in capacitors and for electrochemical reactions on the surface of electrodes. 30,31 This combination of pseudocapacitive and electrical double-layer capacitance mechanisms (of energy storage) of these composites can significantly improve their electrochemical performance and catalytic activities.…”

Section: Introductionmentioning

confidence: 99%

Engineering of nickel‐cobalt oxide nanostructures based on biomass material for high performance supercapacitor and catalytic water splitting

et al. 2021

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The purpose of the present study is to report the synthesis of a porous composite constructed from chicken feathers (CF) and nickel and cobalt salts and its application as a new material for modification of positive electrode surface used in supercapacitor as well as hydrogen and oxygen evolution. In this regard, we used waste CF as a biomass precursor and nitrate salts of nickel and cobalt to synthesize a highly porous composite through a solvothermal reaction. After characterization of nanocomposite using different physical and electrochemical techniques, it was used in fabrication of an electrochemical supercapacitor as well as hydrogen and oxygen evolution. The composite demonstrated remarkable electrochemical properties such as fast electrochemical reactions, high conductivity, and high reversibility. In addition, the prepared nanocomposite showed high-specific capacitance of 2000 F g −1 (with current density of 0.5 mA cm −2 or 1 A g −1 ) as a supercapacitor. It also shows high

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“…Liao et al reported vertically aligned cobalt oxide nanoparticles on a graphene sheet with the carbon fabric to assemble a flexible asymmetric device with a maximum value of ~580 F g −1 5 . The nickel‐cobalt‐based solid‐state device showed an excellent specific capacitance and cycling stability of 100.7 F g −1 at 1 A g −1 and 132.3% retaining of its primary capacitance after 50 000 cycles, respectively 6 . Xing et al reported vertically grown Ni–Co hydroxide nanosheets on nickel foam by a hydrothermal process for SC applications, and their asymmetric capacitance was 439.5 mF cm −2 at 2 mA cm −2 with excellent stability cycles 7 .…”

Section: Introductionmentioning

confidence: 99%

Effect of ruthenium oxide on the capacitance and gas‐sensing performances of cobalt oxide @nitrogen‐doped graphene oxide composites

et al. 2021

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Summary Co3O4/RuO2@nitrogen‐doped graphene oxide (NGO) composite materials were synthesized through a sonication‐assisted thermal reduction method in the presence of cobalt and ruthenium starting reagents for supercapacitor and gas sensor applications. The composite materials were characterized using various analytical tools to confirm the structural and morphological properties. The synthesized Co3O4/RuO2@NGO composites showed the nanostructured grains anchored on the NGO surface. The electrochemical storage performance was studied by using cyclic voltammetry, galvanostatic charge discharge, and electrochemical impedance spectroscopy using a two‐electrode asymmetric configuration. The prepared Co3O4/RuO2@NGO electrode exhibited a maximum capacitance of ~149 F/g at an applied current of ~0.5 A/g, an energy density of 20.69 Wh kg−1, and at a power density of 250 W kg−1. The cycling behavior of the fabricated asymmetric capacitor revealed a 90% capacitance retention after 5000 cycles. Moreover, the prepared composite material was used successfully for dimethyl methylophosphonate (DMMP) vapor detection, showing excellent sensitivity, selectivity, and stability. Therefore, the constructed Co3O4/RuO2@NGO composite is a suitable material for supercapacitors and DMMP gas‐detection applications.

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Designed synthesis of nickel–cobalt-based electrode materials for high-performance solid-state hybrid supercapacitors

Abstract: Schematic descriptions for the formation of CoNi2S4, NiCo-LDH, and NiO/Co3O4 and the excellent electrochemical performance of CoNi2S4.

Cited by 93 publications

References 62 publications

Encapsulation of Co₃O₄ Nanocone Arrays via Ultrathin NiO for Superior Performance Asymmetric Supercapacitors

Encapsulation of Co₃O₄ Nanocone Arrays via Ultrathin NiO for Superior Performance Asymmetric Supercapacitors

Engineering of nickel‐cobalt oxide nanostructures based on biomass material for high performance supercapacitor and catalytic water splitting

Effect of ruthenium oxide on the capacitance and gas‐sensing performances of cobalt oxide @nitrogen‐doped graphene oxide composites

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Designed synthesis of nickel–cobalt-based electrode materials for high-performance solid-state hybrid supercapacitors

Abstract: Schematic descriptions for the formation of CoNi2S4, NiCo-LDH, and NiO/Co3O4 and the excellent electrochemical performance of CoNi2S4.

Cited by 93 publications

References 62 publications

Encapsulation of Co3O4 Nanocone Arrays via Ultrathin NiO for Superior Performance Asymmetric Supercapacitors

Encapsulation of Co3O4 Nanocone Arrays via Ultrathin NiO for Superior Performance Asymmetric Supercapacitors

Engineering of nickel‐cobalt oxide nanostructures based on biomass material for high performance supercapacitor and catalytic water splitting

Effect of ruthenium oxide on the capacitance and gas‐sensing performances of cobalt oxide @nitrogen‐doped graphene oxide composites

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Encapsulation of Co₃O₄ Nanocone Arrays via Ultrathin NiO for Superior Performance Asymmetric Supercapacitors

Encapsulation of Co₃O₄ Nanocone Arrays via Ultrathin NiO for Superior Performance Asymmetric Supercapacitors