Fabrication of ultrahigh supercapacitor device based on ZnCo2O4@MnO2 with porous nanospheres decorated on flower-shaped structure

Saini, Sunaina; Chand, Pooran; Joshi, Aman

doi:10.1016/j.est.2023.108209

Cited by 25 publications

(3 citation statements)

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“…ZnCo 2 O 4 as a core material has proven its worthiness on many previous occasions, where recently Saini et al developed a core−shell structured electrode with ZnCo 2 O 4 @MnO 2 using a two-step hydrothermal method to achieve a high specific capacitance of 4223.53 F/g (1 A/g), and the fabricated asymmetric supercapacitor delivered an ultrahigh energy density of 257 Wh/kg at a power density of 1250 W/kg with a stability of 97.2% (5000 cycles). 25 In the other recent work on core−shell structure, there have been reports of ZnCo 2 O 4 @Ni(OH) 2 , 26 ZnCo 2 O 4 @NiO, 27 ZnCo 2 O 4 @CoMoO 4 , 28 ZnCo 2 O 4 @NiCo 2 O 4 , 29 etc., proving ZnCo 2 O 4 as an efficient core material, which has compatibility with various shell materials. These cores have energy storage properties; an efficient shell material selection is highly promising to achieve enhanced electrochemical properties and can be considered a better material choice for the shell structure.…”

Section: Introductionmentioning

confidence: 99%

“…These characteristics are essential for understanding and optimizing the performance of ZnCo 2 O 4 -based materials in energy storage applications, which make it the right choice for core structure, as a promising supercapacitor electrode material. ZnCo 2 O 4 as a core material has proven its worthiness on many previous occasions, where recently Saini et al developed a core–shell structured electrode with ZnCo 2 O 4 @MnO 2 using a two-step hydrothermal method to achieve a high specific capacitance of 4223.53 F/g (1 A/g), and the fabricated asymmetric supercapacitor delivered an ultrahigh energy density of 257 Wh/kg at a power density of 1250 W/kg with a stability of 97.2% (5000 cycles) . In the other recent work on core–shell structure, there have been reports of ZnCo 2 O 4 @Ni(OH) 2 , ZnCo 2 O 4 @NiO, ZnCo 2 O 4 @CoMoO 4 , ZnCo 2 O 4 @NiCo 2 O 4 , etc., proving ZnCo 2 O 4 as an efficient core material, which has compatibility with various shell materials.…”

Section: Introductionmentioning

confidence: 99%

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Nanostructured ZnCo₂O₄@NiMn-LDH Electrodes for Supercapacitor and Zinc-Air Battery Application

Bhanuse,

Kumar,

et al. 2024

ACS Appl. Nano Mater.

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Herein, we have developed a two-step hydrothermal reaction to fabricate core−shell nanostructured ZnCo 2 O 4 @NiMn-LDH on nickel foam. The electrode material composition is optimized by different feed ratios of Ni in the shell structure, which is composed of NiMn-LDH. In three-electrode electrochemical analysis, ZnCo 2 O 4 @NiMn-LDH (2:1) exhibited a specific capacitance of 5165 F/g at a current density of 1 A/g in 6 M KOH electrolyte. Moreover, the rate capability of retention of ZnCo 2 O 4 @NiMn-LDH (2:1) reached 80% at a current density of 4 A/g. Finally, a solid-state asymmetric supercapacitor is assembled by using ZnCo 2 O 4 @NiMn-LDH as the positive electrode and α-Fe 2 O 3 as the negative electrode placed inside the Swagelok cell device with a separator. The fabricated supercapacitor ZnCo 2 O 4 @ NiMn-LDH (2:1)||α-Fe 2 O 3 exhibits an energy density of 64.6 Wh/kg at a power density of 748 W/kg and a cyclic stability of 97.9% after 3000 cycles. For the zinc−air battery (ZAB) application, ZnCo 2 O 4 @NiMn-LDH (2:1) delivered a lower overpotential of 390 mV at a 50 mA/cm 2 current density with good stability in an alkaline medium. It exhibited a power density of 43 mW/cm 2 with stability throughout the 200 h. Both applications suggest that ZnCo 2 O 4 @NiMn-LDH is considered an efficient nanostructured electrode for energy applications.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Nanostructured ZnCo₂O₄@NiMn-LDH Electrodes for Supercapacitor and Zinc-Air Battery Application

Bhanuse,

Kumar,

et al. 2024

ACS Appl. Nano Mater.

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“…Among these materials, transition-metal oxides represent a viable option owing to their eco-friendliness, stable performance, safety, and ease of implementation [17][18][19]. Spinel-structured oxides such as ZnCo 2 O 4 , MnCo 2 O 4 , and CuCo 2 O 4 have become an area of active research owing to their excellent theoretical electrochemical properties [20][21][22]. CuCo 2 O 4 has a high theoretical specific capacitance and low theoretical resistance by the synergistic effect of cobalt and copper ions [23].…”

Section: Introductionmentioning

confidence: 99%

Multifunctional sulfur doping in cobalt-based materials for high-energy density supercapacitors

Huang,

Wang,

Yang

et al. 2024

Nanotechnology

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In this study, S-CCO@Co(OH)2 (‘CCO’ representing CuCo2O4/Cu2O; ‘S-’representing sulfur doping) was synthesized by hydrothermal method followed by electrodeposition. The multiple effects of S doping were studied by S doping and constructing 3D core–shell structure. S doping induced the reduction of Cu2+ and Co3+ to Cu+ and Co2+, respectively. Also, S partially replaces O and creates oxygen vacancies, which increases a number of active sites for the redox reaction enhancing the redox reaction activity. After the electrodeposition, S–Co bond is formed between the Co(OH)2 shell and the S-CCO core, which suggests a synergistic effect between S doping and core–shell structure. The formation of S–Co bond is conducive to electron and ion transport, thus improving electrochemical performance. After modification, the specific capacitance of S-CCO@Co(OH)2 is 4.28 times higher than CCO, up to 1730 Fg−1. Furthermore, the assembled S-CCO@Co(OH)2//activated carbon supercapacitor exhibits an energy density of 83.89 Whkg−1 at 848.81 Wkg−1 and a retention rate of 98.48% after 5000 charge and discharge cycles. Therefore, S doping and its mutual effect with the utilization of the core–shell structure considerably enhanced the electrochemical performance of the CCO-based electrodes, endowing its potential in further application.

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3D hierarchical porous N, O co‐doped carbon derived from the waste walnut shell via one‐step carbonization for high‐performance supercapacitor

Liu,

Li,

Wang

et al. 2024

Electroanalysis

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Fabrication of ultrahigh supercapacitor device based on ZnCo2O4@MnO2 with porous nanospheres decorated on flower-shaped structure

Cited by 25 publications

References 49 publications

Nanostructured ZnCo₂O₄@NiMn-LDH Electrodes for Supercapacitor and Zinc-Air Battery Application

Nanostructured ZnCo₂O₄@NiMn-LDH Electrodes for Supercapacitor and Zinc-Air Battery Application

Multifunctional sulfur doping in cobalt-based materials for high-energy density supercapacitors

3D hierarchical porous N, O co‐doped carbon derived from the waste walnut shell via one‐step carbonization for high‐performance supercapacitor

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Fabrication of ultrahigh supercapacitor device based on ZnCo2O4@MnO2 with porous nanospheres decorated on flower-shaped structure

Cited by 25 publications

References 49 publications

Nanostructured ZnCo2O4@NiMn-LDH Electrodes for Supercapacitor and Zinc-Air Battery Application

Nanostructured ZnCo2O4@NiMn-LDH Electrodes for Supercapacitor and Zinc-Air Battery Application

Multifunctional sulfur doping in cobalt-based materials for high-energy density supercapacitors

3D hierarchical porous N, O co‐doped carbon derived from the waste walnut shell via one‐step carbonization for high‐performance supercapacitor

Contact Info

Product

Resources

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Nanostructured ZnCo₂O₄@NiMn-LDH Electrodes for Supercapacitor and Zinc-Air Battery Application

Nanostructured ZnCo₂O₄@NiMn-LDH Electrodes for Supercapacitor and Zinc-Air Battery Application