An advanced sandwich-type architecture of MnCo2O4@N–C@MnO2 as an efficient electrode material for a high-energy density hybrid asymmetric solid-state supercapacitor

Shrestha, Khem Raj; Kandula, Syam; Rajeshkhanna, G.; Srivastava, Manish; Kim, Nam Hoon; Lee, Joong Hee

doi:10.1039/c8ta08976k

Cited by 114 publications

(49 citation statements)

References 53 publications

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“…The electrochemical performance of La 2‐x Co x CuO 4 hybrid composite prepared in this study has comparable with many reports . The specific capacitance of synthesized hybrid composite is 1304 F/g (6M KOH) with 98% retention capacitance.…”

Section: Resultssupporting

confidence: 85%

“…The electrochemical performance of La 2-x Co x CuO 4 hybrid composite prepared in this study has comparable with many reports. [32][33][34][35][36] The specific capacitance of synthesized hybrid composite is 1304 F/g (6M KOH) with 98% retention capacitance. The higher specific capacitance and retention capacitance obtained in this case represents very good stability as supercapacitor electrode.…”

Section: Electrochemical Properties Measurementsmentioning

confidence: 99%

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Fabrication of novel hybrid composite La_2-xCo_xCuO₄electrode for high performance supercapacitors

et al. 2019

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Summary Hybrid composites La2‐xCoxCuO4 (x = 0, 0.1, 0.2, and 0.3) are prepared using one‐step simple hydrothermal route as electrodes for supercapacitors. The effect of varying cobalt content on morphological, structural, and electrochemical properties has been explored using X‐ray diffraction, scanning electron microscopy, and cyclic voltammetry, respectively. The structural parameters obtained by X‐ray diffraction showed tetragonal phase of hybrid composite without any evident impurity phases. The analysis of morphological properties suggested a strong correlation with electrochemical properties, for instance, a relationship between fabric porous structures and electrochemically active sites for redox reactions and intercalation/de‐intercalation processes. The hybrid composite electrodes demonstrated high specific capacitance of the order of 1304 F/g at 10 mV/s scan rate and exhibited decreasing trend on increasing scan rate. Hybrid composites were also tested for their ability as an electrode of high performance supercapacitors in different aqueous electrolytes, i. e, KOH, H2SO4, and Na2SO4 to optimize the best compatible electrolyte. The composite electrode material showed excellent cyclic stability and 98% capacitance retention for 1 A/g after 2000 cycles. The remarkable performance of hybrid composite electrode entails its potential for commercial applications of supercapacitors.

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Section: Resultssupporting

confidence: 85%

Section: Electrochemical Properties Measurementsmentioning

confidence: 99%

Fabrication of novel hybrid composite La_2-xCo_xCuO₄electrode for high performance supercapacitors

et al. 2019

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“…Hence, it is reasonably speculated that Pt NPs as electron donors interplay with the support, which triggers the electron transmission in the cycles of Mn(Co) 2+ and Mn(Co) 3+ and creates extra oxygen defects and the subsequent ROS. As presented in Figure d, three fitted peaks at 531.1, 531.8 and 532.7 eV correspond to oxygen of lattice, adsorbed oxygen species (O ads ) /hydroxyl, and chemisorbed water, respectively . The relatively strong peak at 531.7 eV manifests a large amount of adsorbed oxygen species (O ads ) and/or surface hydroxyl on the catalyst's surface, which would enhance the HCHO adsorption and its following decomposition.…”

Section: Resultsmentioning

confidence: 98%

Pt Anchored on Mn(Co)CO₃/MnCo₂O₄ Heterostructure for Complete Oxidation of Formaldehyde at Room Temperature

Wang

Luo

et al. 2020

ChemistrySelect

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Mn(Co)CO3/MnCo2O4 hybrids were prepared via a hydrothermal following by heat‐treatment process and used as novel supports of Pt nanoparticles for formaldehyde (HCHO) removal at room temperature. The catalyst heat‐treated at 150 °C had a primary nanorod‐like morphology, however, its well‐defined structure was obviously collapsed when the heat‐treatment temperature was above 350 °C. In the static experiment where indoor HCHO removal was simulated at room temperature, the catalyst heat‐treated at 150 °C with only 0.4 wt % Pt showed the best catalytic activity among the investigated samples, which possessed a HCHO removal efficiency of 92.2 % in 60 min under the initial HCHO concentration at approximately 180 ppm. The unique nanorod feature and heterogeneous interface between MnCo2O4 and Mn(Co)CO3 (MnCO3 and CoCO3) with a proper weight ratio are the main contributions to the superior catalytic performance of the catalyst by boosting the charge transfer and active oxygen species formation in the process of HCHO catalytic oxidation reaction. Our work indicates that well‐defined morphological heterostructures which facilitate the charge migration and formation of reactive oxygen species, could be the potential alternative catalysts in the enhancement of HCHO decomposition at room temperature.

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“…The fitted values of 0.63 and 0.53 for anodic and cathodic processes indicate that the electrode mainly has a capacitive nature, which is in step with the results obtained from the phase angle and frequency diagram (Figure E) of EIS. The percentage of diffusion controlled and capacitive nature can be obtained using the following Equation :

i = k_{1} bold-italic\times ϑ + k_{2} \times ϑ^{\frac{1}{2}} .

…”

Section: Resultsmentioning

confidence: 99%

Synthesis and characterisation of amorphous MnO ₂ /CNT via solid‐state microwave for high‐performance supercapacitors

et al. 2020

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Summary Amorphous MnO2 was attached to carbon nanotubes (CNTs) in 60 seconds by solid‐state microwave method. As electrodes in supercapacitors, the coactions of the MnO2 and CNT augmented the actual value of capacitance to 1250 F g−1, and cycle steadiness held 80% of the starting value after 7000 cycles. The equipped MnO2/CNT//AC asymmetric supercapacitor (ASC) manifested preferable energy density with 33.5 Wh kg−1 (at 400 W kg−1). Its glorious electrochemical properties of MnO2/CNT demonstrated that the microwave method has great potency to realise the composite of electrode materials.

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An advanced sandwich-type architecture of MnCo₂O₄@N–C@MnO₂ as an efficient electrode material for a high-energy density hybrid asymmetric solid-state supercapacitor

Abstract: A thin layer of N–C sandwiched between an electroactive MnCo2O4 core and MnO2 shell results in sophisticated, robust core@sandwich@shell as a highly efficient energy storage material.

Cited by 114 publications

References 53 publications

Fabrication of novel hybrid composite La_2-xCo_xCuO₄electrode for high performance supercapacitors

Fabrication of novel hybrid composite La_2-xCo_xCuO₄electrode for high performance supercapacitors

Pt Anchored on Mn(Co)CO₃/MnCo₂O₄ Heterostructure for Complete Oxidation of Formaldehyde at Room Temperature

Synthesis and characterisation of amorphous MnO ₂ /CNT via solid‐state microwave for high‐performance supercapacitors

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An advanced sandwich-type architecture of MnCo2O4@N–C@MnO2 as an efficient electrode material for a high-energy density hybrid asymmetric solid-state supercapacitor

Abstract: A thin layer of N–C sandwiched between an electroactive MnCo2O4 core and MnO2 shell results in sophisticated, robust core@sandwich@shell as a highly efficient energy storage material.

Cited by 114 publications

References 53 publications

Fabrication of novel hybrid composite La2-xCoxCuO4electrode for high performance supercapacitors

Fabrication of novel hybrid composite La2-xCoxCuO4electrode for high performance supercapacitors

Pt Anchored on Mn(Co)CO3/MnCo2O4 Heterostructure for Complete Oxidation of Formaldehyde at Room Temperature

Synthesis and characterisation of amorphous MnO 2 /CNT via solid‐state microwave for high‐performance supercapacitors

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An advanced sandwich-type architecture of MnCo₂O₄@N–C@MnO₂ as an efficient electrode material for a high-energy density hybrid asymmetric solid-state supercapacitor

Fabrication of novel hybrid composite La_2-xCo_xCuO₄electrode for high performance supercapacitors

Fabrication of novel hybrid composite La_2-xCo_xCuO₄electrode for high performance supercapacitors

Pt Anchored on Mn(Co)CO₃/MnCo₂O₄ Heterostructure for Complete Oxidation of Formaldehyde at Room Temperature

Synthesis and characterisation of amorphous MnO ₂ /CNT via solid‐state microwave for high‐performance supercapacitors