Unveiling the structural, charge density distribution and supercapacitor performance of NiCo2O4 nano flowers for asymmetric device fabrication

Packiaraj, R.; Devendran, P.; Venkatesh, K. S.; Mahendraprabhu, Kamaraj; Nallamuthu, N.

doi:10.1016/j.est.2020.102029

Cited by 48 publications

(13 citation statements)

References 63 publications

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“…The accomplished values are greater or even comparable to the recently reported Ni and Co materials based hybrid systems (Table S2). [41][42][43][44][45][46][47][48] Furthermore, the cyclic stability and Coulombic efficiency of the NCO1//AC HSC was investigated for continuous 20 000 GCD cycles at 10 A g À1 with almost 99% of the Coulombic efficiency (Figure 5H). It can be observed that the HSC retained around 80.56% of its initial capacitance maintained over 20 000 cycles, emphasizing the excellent stability and reversible behavior of the HSC.…”

Section: Materials and Electrochemical Characterization Details Are In The Supplementary Information 3 | Results And Discussionmentioning

confidence: 99%

Two dimensional layered nickel cobaltite nanosheets as an efficient electrode material for high‐performance hybrid supercapacitor

et al. 2021

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Nickel cobalt oxide (NCO) is considered an auspicious electrode candidate for the reinforcement of energy-storage devices. Currently, an immense interest is devoted to modifying the morphological aspects of the NCO to boost their surface texture and electrochemical performances, which is feasible for the development of high energy density and durable devices. Herein, we report the synthesis of layered NCO nanosheets via solvothermal reaction by tuning the solvent volume ratio (water/N,N-Dimethylformamide [DMF]) for supercapacitor electrode material. The nickel cobalt oxide is prepared utilizing a 1:2 (DMF:water) ratio of solvent (NCO1) displays a controlled growth of 2D nanosheets with excellent surface texture. Moreover, NCO1 demonstrates the battery type charge storage properties with a maximum specific capacitance (C sp ) of 731 F g À1 , which is far better than NCO2 (623 F g À1 ) and NCO3 (556 F g À1 ) prepared in other solvent proportions. Besides, the constructed hybrid supercapacitor utilizing activated carbon (AC) and NCO1 as the negative and positive electrodes, respectively, exhibits the C sp of 120 F g À1 , and maximum specific energy 37.33 W h kg À1 for the specific power 691.31 W kg À1 and demonstrates excellent stability~80.56% for 20 000 cycles.In different electrochemical energy storage devices, supercapacitors (SCs) have gained abundant consideration as a novel and promising future energy storage device. [1][2][3] Due to their cost effectiveness, fast discharge and charge rate, extraordinary power density, exceptionally extended lifespan, and better safety reliability. [4][5][6] Despite SCs have these excellent features, the limited energy density has severely restricted their feasible application compare to batteries. 7-9 Thus, it is essential to lift

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Section: Materials and Electrochemical Characterization Details Are In The Supplementary Information 3 | Results And Discussionmentioning

confidence: 99%

Two dimensional layered nickel cobaltite nanosheets as an efficient electrode material for high‐performance hybrid supercapacitor

et al. 2021

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“…The correlation coefficient is R 2 = 0.9990 for the cathodic and R 2 = 0.9989 for the anodic peaks, suggesting that the obtained electrode system is controlled by a typical diffusion process. 44 The galvanostatic charge and discharge (GCD) curves of ZIF-67, NiCo 2 O 4 , and Co 3 O 4 /NiCo 2 O 4 at current densities of 45 The charge curve of the Co 3 O 4 /NiCo 2 O 4 electrode exhibits a longer discharge platform among the three samples at a current density of 0.5 A g −1 , which has a better faradaic redox reversibility and rate capability. 31 attributed to its better redox reactions and higher electronic conductivity than the monometallic oxides.…”

Section: Resultsmentioning

confidence: 99%

Design of ZIF-67 MOF-derived Co₃O₄/NiCo₂O₄ nanosheets for supercapacitor electrode materials

Zhang

Wen

et al. 2021

Journal of Chemical Research

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Binary transition metal oxides exhibit improved properties including good redox potentials and electrical conductivities compared with single metal oxides as electrode materials in energy storage. Herein, ZIF-67 is prepared by a one-step method using Co2+ as the central metal ion, 2-methylimidazole as the organic ligand, and methanol as an organic solvent at room temperature. Hollow NiCo2O4 and sheet-like Co3O4/NiCo2O4 derived from bimetallic imidazolate framework precursors were synthesized by adding cobalt and nickel ions in appropriate proportions. A hollow and porous structure is achieved for the reaction between a nickel salt and ZIF-67, and this unique nanostructure provides a high active surface area, which is beneficial to the electrochemical properties. Several samples are prepared and used as electrode materials for electrochemical tests in 6 M KOH. As a result, the Co3O4/NiCo2O4 electrode with a sheet nanostructure showed a high specific capacitance of 846 F g−1 at a current density of 0.5 A g−1. This Co3O4/NiCo2O4 electrode material is promising for future studies on high-performance supercapacitors to solve emerging energy-related problems. [Formula: see text]

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“…F, Nyquist spectrum of ASC (inset: enlarged plot at high frequency region) materials (Table 1). [64][65][66][67][68][69][70][71] The cyclic stability of the ASC device was investigated for 10 000 cycles at 10 A g À1 , as shown in Figure 8C. About 89.42% of capacitance retention is observed for 10 000 charge-discharge cycles, implying their excellent robustness of prepared electrode material and ASC device.…”

Section: Supercapacitorsmentioning

confidence: 97%

Hierarchical NiCo / NiO / NiCo ₂ O ₄ composite formation by solvothermal reaction as a potential electrode material for hydrogen evolutions and asymmetric supercapacitors

et al. 2021

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Electrochemical energy storage and conversion mechanisms are highly viable routes in the current scenario, and hence supercapacitor and electrolysis of water splitting have gained significant attention in recent times. Thus, transition metal nickel cobalt oxides are widely inspected as promising electrode materials for electrocatalysis and supercapacitors. However, the pure NiCo 2 O 4 was highly hindered by its widespread uses due to low electronic conductivity and deficient active edges. This study is aimed to fabricate the NiCo/NiO/NiCo 2 O 4 composite using a solvothermal process with different ratios of solvents. The inherent NiCo/NiO/NiCo 2 O 4 composite holds plentiful active edges and improved electrical conductivity than the pure. Interestingly, the electrocatalytic results revealed that the NiCo/NiO/NiCo 2 O 4 (NC) composite prepared by a solvent ratio of (dou-

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Unveiling the structural, charge density distribution and supercapacitor performance of NiCo2O4 nano flowers for asymmetric device fabrication

Cited by 48 publications

References 63 publications

Two dimensional layered nickel cobaltite nanosheets as an efficient electrode material for high‐performance hybrid supercapacitor

Two dimensional layered nickel cobaltite nanosheets as an efficient electrode material for high‐performance hybrid supercapacitor

Design of ZIF-67 MOF-derived Co₃O₄/NiCo₂O₄ nanosheets for supercapacitor electrode materials

Hierarchical NiCo / NiO / NiCo ₂ O ₄ composite formation by solvothermal reaction as a potential electrode material for hydrogen evolutions and asymmetric supercapacitors

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Unveiling the structural, charge density distribution and supercapacitor performance of NiCo2O4 nano flowers for asymmetric device fabrication

Cited by 48 publications

References 63 publications

Two dimensional layered nickel cobaltite nanosheets as an efficient electrode material for high‐performance hybrid supercapacitor

Two dimensional layered nickel cobaltite nanosheets as an efficient electrode material for high‐performance hybrid supercapacitor

Design of ZIF-67 MOF-derived Co3O4/NiCo2O4 nanosheets for supercapacitor electrode materials

Hierarchical NiCo / NiO / NiCo 2 O 4 composite formation by solvothermal reaction as a potential electrode material for hydrogen evolutions and asymmetric supercapacitors

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Design of ZIF-67 MOF-derived Co₃O₄/NiCo₂O₄ nanosheets for supercapacitor electrode materials

Hierarchical NiCo / NiO / NiCo ₂ O ₄ composite formation by solvothermal reaction as a potential electrode material for hydrogen evolutions and asymmetric supercapacitors