Electrochemical performance enhancement in MnCo 2 O 4 nanoflake/graphene nanoplatelets composite

Al-Rubaye, Shaymaa; Rajagopalan, Ranjusha; Subramaniyam, Chandrasekar Mayandi; Yu, Zhou; Dou, Shi Xue; Cheng, Zhenxiang

doi:10.1016/j.jpowsour.2016.05.081

Cited by 55 publications

(27 citation statements)

References 31 publications

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“…For example, NH 4 F used as an addictive may be a potential accelerator for the loading of collector during hydrothermal reaction, which will affect the morphology of the products . Al‐Rubaye et al have synthesized MnCo 2 O 4 nanoflakes/graphene nanoplatelets composites with different morphologies by changing the amount of NH 4 F, in which the composite with 0.4 g NH 4 F showed superior specific capacitance (1268 F g −1 at 1 A g −1 ) . Zhang et al designed a series of nanostructured NiCo 2 O 4 on NF by adjusting the type of alkali and the addition of NH 4 F .…”

Section: Introductionmentioning

confidence: 91%

“…SCs can be grouped into two categories, electrochemical double layer capacitors (EDLCs), and pseudocapacitors. EDLCs generally store the charges through physical adsorption‐desorption process, whereas pseudocapacitors store the charges by Faradaic redox reactions based on the electron storage mechanism ,. The biggest hindrance to the application of SCs is their poor energy density .…”

Section: Introductionmentioning

confidence: 99%

“…Several ways to improve the energy storage capacity of electrode materials have been proposed, including nanostructured electrode materials containing carbon‐based materials, transition metal oxides/hydroxides and conductive polymer materials ,. Among these electrode materials, transition metal oxides/hydroxides have been widely investigated and displayed the outstanding performance due to their high theoretical capacitance . Especially, layered double hydroxides (LDHs), as one of the transition metal hydroxides, have fascinated researchers owing to their flexible ion‐change capacity and adjustable composition ,.…”

Section: Introductionmentioning

confidence: 99%

“…EDLCs generally store the charges through physical adsorption-desorption process, whereas pseudocapacitors store the charges by Faradaic redox reactions based on the electron storage mechanism. [4,5] The biggest hindrance to the application of SCs is their poor energy density. [6] Several ways to improve the energy storage capacity of electrode materials have been proposed, including nanostructured electrode materials containing carbon-based materials, transition metal oxides/hydroxides and conductive polymer materials.…”

Section: Introductionmentioning

confidence: 99%

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Rational Assembly of CoAl‐Layered Double Hydroxide on Reduced Graphene Oxide with Enhanced Electrochemical Performance for Energy Storage

Tao

Xuan

et al. 2018

ChemElectroChem

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In this paper, we designed and synthesized composites of CoAl‐layered double hydroxide on reduced graphene oxide (CoAl‐LDH@rGO/NF) via a facile approach. The Co‐Al layered double hydroxide (CoAl‐LDH) nanosheets were grown onto the skeleton of reduced graphene oxide on Ni foam (rGO/NF). The as‐synthesized CoAl‐LDH@rGO/NF composites exhibited a superior electrochemical behavior, attributed to the coupling effect of homogeneous CoAl‐LDH nanosheets and high conductivity of rGO. In addition, the different morphologies of the CoAl‐LDH@rGO/NF composites can be controlled by adjusting the amount of NH4F. The optimum electrochemical performance of the CoAl‐LDH@rGO/NF hybrid electrode was obtained when the amount of NH4F was 6 mmol. The largest specific capacitance of 1671.4 F g−1 (1 A g−1) and the ultra‐high cycling performance with 97 % retention of the original value were achieved even after 5000 charge‐discharge cycles. A remarkable energy density value of 41.3 Wh kg−1 at a power density of 408.9 W kg−1 was achieved in the asymmetric supercapacitor (ASC) using CoAl‐LDH@rGO‐6/NF and activated carbon (AC) for positive and negative materials. Furthermore, the ASC retained 100 % of its original energy density value even after 5000 cycles. In addition, a design method for preparing high performance electrode materials with ideal morphology is proposed in this paper, which might be helpful to the future study of morphology and electrochemical properties.

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Section: Introductionmentioning

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Rational Assembly of CoAl‐Layered Double Hydroxide on Reduced Graphene Oxide with Enhanced Electrochemical Performance for Energy Storage

Tao

Xuan

et al. 2018

ChemElectroChem

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“…On the other hand, metal oxide loaded on graphene can also decrease the agglomeration of graphene layers; thus increasing the electrical double‐layer capacitor (EDLC) energy storage. For these reasons, metal oxide/graphene composites are attractive for use as electrode materials for LIBs or supercapacitors, such as NiCo 2 O 4 nanosheets on graphene layers and MnCo 2 O 4 nanoflake/graphene nanoplatelets . Although the electrochemical properties have been enhanced for applications in LIBs or supercapacitor electrode materials individually, few composites can be used for both LIBs and supercapacitors.…”

Section: Introductionmentioning

confidence: 99%

Mn_0.5Co_2.5O₄ Nanofibers Intercalated into Graphene Frameworks with Mesoporous Structure for Batteries and Supercapacitors

2017

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Self‐assembled manganese cobalt oxide (Mn0.5Co2.5O4) nanofibers intercalated into graphene frameworks (Mn0.5Co2.5O4@G) with a mesoporous structure are successfully synthesized by a hydrothermal treatment and annealing process. The unique structure can effectively prevent volume changes of Mn0.5Co2.5O4 nanofibers and graphene layers from restacking, and enhance the electrode kinetics, so the composite demonstrates superior electrochemical performances for lithium‐ion batteries (LIBs) and supercapacitors. As an anode material for LIBs, the Mn0.5Co2.5O4@G composite shows a large reversible specific capacity of 950 mAh g−1 after 100 cycles at a current density of 0.2 A g−1. In a three‐electrode system, it achieves specific capacitances of 1926 F g−1 at a current density of 10 A g−1, and capacitances of 1575 and 1211 F g−1 at ultrahigh current densities of 30 and 40 A g−1, respectively. For an asymmetric supercapacitor, Mn0.5Co2.5O4@G//AC (AC=activated carbon) can achieve high energy densities of 64.9 and 14.6 Wh kg−1 at power densities of 75.2 and 3754.3 W kg−1, respectively.

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Spinel MnCo₂O₄ Nanoparticles Supported on Three‐Dimensional Graphene with Enhanced Mass Transfer as an Efficient Electrocatalyst for the Oxygen Reduction Reaction

et al. 2018

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The rational design of highly efficient and durable oxygen reduction reaction (ORR) catalysts is critical for the commercial application of fuel cells. Herein, three-dimensional graphene (3D-G) is synthesized by the template method, which used coal tar pitch as the carbon source and nano MgO as the template. Then, spinel MnCo O is in situ supported on the 3D-G by a facile hydrothermal method, giving MnCo O /3D-G. The resultant MnCo O /3D-G retains the multilayered mesoporous graphene structure where MnCo O nanoparticles are deposited on the inner walls of pores in the 3D-G. The catalyst MnCo O /3D-G shows high electrocatalytic activity with a half-wave potential of 0.81 V versus reversible hydrogen electrode, which is clearly superior to those of MnCo O /reduced graphene oxide (0.78 V), MnCo O /carbon nanotubes (0.74 V), MnCo O /C (0.72 V), and 20 wt % Pt/C (0.80 V). The electron transfer number of MnCo O /3D-G indicates a four-electron process of ORR. The durability test demonstrates that the MnCo O /3D-G catalyst has a much better durability than 20 wt % Pt/C. Our work makes an inspiring strategy to prepare high-performance electrocatalysts for the development of fuel cells.

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Electrochemical performance enhancement in MnCo 2 O 4 nanoflake/graphene nanoplatelets composite

Cited by 55 publications

References 31 publications

Rational Assembly of CoAl‐Layered Double Hydroxide on Reduced Graphene Oxide with Enhanced Electrochemical Performance for Energy Storage

Rational Assembly of CoAl‐Layered Double Hydroxide on Reduced Graphene Oxide with Enhanced Electrochemical Performance for Energy Storage

Mn_0.5Co_2.5O₄ Nanofibers Intercalated into Graphene Frameworks with Mesoporous Structure for Batteries and Supercapacitors

Spinel MnCo₂O₄ Nanoparticles Supported on Three‐Dimensional Graphene with Enhanced Mass Transfer as an Efficient Electrocatalyst for the Oxygen Reduction Reaction

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Electrochemical performance enhancement in MnCo 2 O 4 nanoflake/graphene nanoplatelets composite

Cited by 55 publications

References 31 publications

Rational Assembly of CoAl‐Layered Double Hydroxide on Reduced Graphene Oxide with Enhanced Electrochemical Performance for Energy Storage

Rational Assembly of CoAl‐Layered Double Hydroxide on Reduced Graphene Oxide with Enhanced Electrochemical Performance for Energy Storage

Mn0.5Co2.5O4 Nanofibers Intercalated into Graphene Frameworks with Mesoporous Structure for Batteries and Supercapacitors

Spinel MnCo2O4 Nanoparticles Supported on Three‐Dimensional Graphene with Enhanced Mass Transfer as an Efficient Electrocatalyst for the Oxygen Reduction Reaction

Contact Info

Product

Resources

About

Mn_0.5Co_2.5O₄ Nanofibers Intercalated into Graphene Frameworks with Mesoporous Structure for Batteries and Supercapacitors

Spinel MnCo₂O₄ Nanoparticles Supported on Three‐Dimensional Graphene with Enhanced Mass Transfer as an Efficient Electrocatalyst for the Oxygen Reduction Reaction