One-step large scale combustion synthesis mesoporous MnO2/MnCo2O4 composite as electrode material for high-performance supercapacitors

A MnCo2O4@NiMoO4 composite was synthesized on nickel foam by a two‐step method. The composite has a core‐shell structure in which MnCo2O4 nanoneedles are wrapped by NiMoO4 nanoflakes. The MnCo2O4@NiMoO4/Ni foam is applied as a binder‐free electrode for supercapacitors and it achieves a specific capacitance of up to 1718 F g−1 at a current density of 1 A g−1, and 84 % capacitance retention after 6000 charge‐discharge cycles. The capacitance of the MnCo2O4@NiMoO4 composite is much higher than MnCo2O4 nanoneedles and NiMoO4 nanoflakes alone. Moreover, a hybrid supercapacitor is assembled by applying the MnCo2O4@NiMoO4/Ni foam as the positive electrode, activated carbon/Ni foam as the negative electrode. The hybrid supercapacitor reaches an energy density of up to 42.3 W h kg−1 at a power density of 797 W kg−1, a power density of 6256 W kg−1 at an energy density of 17.4 W h kg−1, and 86 % capacitance retention after 2000 charge‐discharge cycles. The results suggest that the rational design of electrode materials with such structure and composition is an effective strategy to improve electrochemical performance.

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“…are satellite peaks. This spectrum suggests the co‐existence of Co 2+ and Co 3+ . Figure d shows the Ni 2p XPS spectrum.…”

Section: Resultsmentioning

confidence: 89%

“…This spectrum suggests the co-existence of Co 2 + and Co 3 + . [30][31][32][33] Figure 3d shows the Ni 2p XPS spectrum. The peaks at 855.0 eV and 873.0 eV are ascribed to Ni 2p 3/2 and Ni 2p 1/2 , demonstrating the existence Ni 2 + .…”

Section: Resultsmentioning

confidence: 99%

A MnCo₂O₄@NiMoO₄ Core‐Shell Composite Supported on Nickel Foam as a Supercapacitor Electrode for Energy Storage

2018

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“…These values were higher than that of the MnCo 2 O 4 electrode (55.0 % capacitance retention). In addition, the specific capacitance and rate capability of the MnCo 2 O 4 /Ni 3 Mn LDH composite electrode were also superior to those reported MnCo 2 O 4 ‐based composite electrodes (Table ) ,. The significantly improved electrochemical performance of the MnCo 2 O 4 /NiMn LDH composite electrodes probably originated from the good synergistic effects of the composite compositions containing layer‐by‐layer microstructures, which fully engaged the electrochemical performance of the MnCo 2 O 4 and NiMn LDH.…”

Section: Resultsmentioning

confidence: 76%

“…Moreover, the anodic and cathodic peaks shifted towards more positive and negative potentials, respectively, as the scan rates were increased. This phenomenon arose from the polarization of the composite electrode ,. The shapes of CV curves nearly did not obviously change with increasing the scan rates from 5 to 30 mV s −1 , suggesting good electrochemical reversibility for the composite electrode .…”

Section: Resultsmentioning

confidence: 95%

“…By fully integrating the advantages of each component, nanocomposites electrodes can achieve significantly improved electrochemical performance compared to the individual components. Using this technical approach, considerable endeavors have been devoted to the design and preparation of MnCo 2 O 4 ‐based nanocomposites employing different components and hierarchical microstructures . For example, Yang et al.…”

Section: Introductionmentioning

confidence: 99%

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Hierarchical MnCo₂O₄/NiMn Layered Double Hydroxide Composite Nanosheet Arrays on Nickel Foam for Enhanced Electrochemical Storage in Supercapacitors

Liu

Shi

et al. 2018

ChemElectroChem

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Herein, we report on layer‐by‐layer MnCo2O4/NiMn double hydroxide (LDH) nanosheet arrays (NAs) that are designed and synthesized by in‐situ growing the NiMn LDH NAs onto the surface of the MnCo2O4 NAs. The layer‐by‐layer architecture together with the synergistic effects between the NiMn LDH and MnCo2O4 components, substantially improves the energy storage performance of the composite NAs electrodes. The optimized composite NAs electrode exhibits a high specific capacitance of 3063 F g−1 at 3 A g−1 (four times with respect to the individual MnCo2O4 electrode), a capacitance retention of 2315 F g−1 at 30 A g−1, and a cycle stability with 94.7 % capacitance retention at 20 A g−1 over 5000 cycles. Moreover, an assembled MnCo2O4/NiMn LDH//active carbon (AC) asymmetric solid‐state supercapacitor (ASSC) is found to achieve a high energy density of 51.9 W h kg−1 at 806 W kg−1. These findings might offer a feasible strategy to synthesize the high‐performance MnCo2O4‐based composite electrodes for supercapacitors (SCs).

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Morphology‐Conserved Transformations of Metal‐Based Precursors to Hierarchically Porous Micro‐/Nanostructures for Electrochemical Energy Conversion and Storage

et al. 2017

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To meet future market demand, developing new structured materials for electrochemical energy conversion and storage systems is essential. Hierarchically porous micro-/nanostructures are favorable for designing such high-performance materials because of their unique features, including: i) the prevention of nanosized particle agglomeration and minimization of interfacial contact resistance, ii) more active sites and shorter ionic diffusion lengths because of their size compared with their large-size counterparts, iii) convenient electrolyte ingress and accommodation of large volume changes, and iv) enhanced light-scattering capability. Here, hierarchically porous micro-/nanostructures produced by morphology-conserved transformations of metal-based precursors are summarized, and their applications as electrodes and/or catalysts in rechargeable batteries, supercapacitors, and solar cells are discussed. Finally, research and development challenges relating to hierarchically porous micro-/nanostructures that must be overcome to increase their utilization in renewable energy applications are outlined.

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One-step large scale combustion synthesis mesoporous MnO2/MnCo2O4 composite as electrode material for high-performance supercapacitors

Cited by 69 publications

References 54 publications

A MnCo₂O₄@NiMoO₄ Core‐Shell Composite Supported on Nickel Foam as a Supercapacitor Electrode for Energy Storage

A MnCo₂O₄@NiMoO₄ Core‐Shell Composite Supported on Nickel Foam as a Supercapacitor Electrode for Energy Storage

Hierarchical MnCo₂O₄/NiMn Layered Double Hydroxide Composite Nanosheet Arrays on Nickel Foam for Enhanced Electrochemical Storage in Supercapacitors

Morphology‐Conserved Transformations of Metal‐Based Precursors to Hierarchically Porous Micro‐/Nanostructures for Electrochemical Energy Conversion and Storage

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One-step large scale combustion synthesis mesoporous MnO2/MnCo2O4 composite as electrode material for high-performance supercapacitors

Cited by 69 publications

References 54 publications

A MnCo2O4@NiMoO4 Core‐Shell Composite Supported on Nickel Foam as a Supercapacitor Electrode for Energy Storage

A MnCo2O4@NiMoO4 Core‐Shell Composite Supported on Nickel Foam as a Supercapacitor Electrode for Energy Storage

Hierarchical MnCo2O4/NiMn Layered Double Hydroxide Composite Nanosheet Arrays on Nickel Foam for Enhanced Electrochemical Storage in Supercapacitors

Morphology‐Conserved Transformations of Metal‐Based Precursors to Hierarchically Porous Micro‐/Nanostructures for Electrochemical Energy Conversion and Storage

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Product

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A MnCo₂O₄@NiMoO₄ Core‐Shell Composite Supported on Nickel Foam as a Supercapacitor Electrode for Energy Storage

A MnCo₂O₄@NiMoO₄ Core‐Shell Composite Supported on Nickel Foam as a Supercapacitor Electrode for Energy Storage

Hierarchical MnCo₂O₄/NiMn Layered Double Hydroxide Composite Nanosheet Arrays on Nickel Foam for Enhanced Electrochemical Storage in Supercapacitors