High-performance Mn3O4/onion-like carbon (OLC) nanohybrid pseudocapacitor: Unravelling the intrinsic properties of OLC against other carbon supports

Makgopa, Katlego; Raju, Kumar; Ejikeme, Paul M.; Ozoemena, Kenneth I.

doi:10.1016/j.carbon.2017.02.050

Cited by 66 publications

(28 citation statements)

References 77 publications

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“…The maximal P could maintain 8 kW kg −1 with the E value maintaining as high as 7.8 Wh kg −1 , which are larger than that of reported manganese oxide-based materials in the literature. The Mn 3 O 4 /rGO shows superior properties in terms of E and P over MnO 2 /rGO (24 Wh kg −1 at 100 W kg −1 ) [ 38 ], cobalt-manganese layered double hydroxide (4.4 Wh kg −1 at 2500 W kg −1 ) [ 39 ], Mn 3 O 4 /onion-like carbon (OLC) nanohybrid (19 Wh kg −1 at 100 W kg −1 ) [ 40 ], spray deposited hausmannite Mn 3 O 4 thin film (8.27 Wh kg −1 at 850 W kg −1 ) [ 41 ], graphene/MnO 2 (6.8 Wh kg −1 at 62 W kg −1 ) [ 42 ], MnO 2 NFs@PPy NWs (25.8 Wh kg −1 at 901.7 W kg −1 ) [ 43 ], and MnO 2 modified silicon (23.2 Wh kg −1 at 400 W kg −1 ) [ 44 ].…”

Section: Resultsmentioning

confidence: 99%

Rapid Production of Mn3O4/rGO as an Efficient Electrode Material for Supercapacitor by Flame Plasma

et al. 2018

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Benefiting from good ion accessibility and high electrical conductivity, graphene-based material as electrodes show promising electrochemical performance in energy storage systems. In this study, a novel strategy is devised to prepare binder-free Mn3O4-reduced graphene oxide (Mn3O4/rGO) electrodes. Well-dispersed and homogeneous Mn3O4 nanosheets are grown on graphene layers through a facile chemical co-precipitation process and subsequent flame procedure. This obtained Mn3O4/rGO nanostructures exhibit excellent gravimetric specific capacitance of 342.5 F g−1 at current density of 1 A g−1 and remarkable cycling stability of 85.47% capacitance retention under 10,000 extreme charge/discharge cycles at large current density. Furthermore, an asymmetric supercapacitor assembled using Mn3O4/rGO and activated graphene (AG) delivers a high energy density of 27.41 Wh kg−1 and a maximum power density of 8 kW kg−1. The material synthesis strategy presented in this study is facile, rapid and simple, which would give an insight into potential strategies for large-scale applications of metal oxide/graphene and hold tremendous promise for power storage applications.

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Section: Resultsmentioning

confidence: 99%

Rapid Production of Mn3O4/rGO as an Efficient Electrode Material for Supercapacitor by Flame Plasma

et al. 2018

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“…CV and GCD of the as‐assembled supercapacitor were measured by a CHI 660E potentiostat. Capacitance of a supercapacitor ( C ) was calculated according to the formula

C = \frac{I Δ t}{Δ U}

where I is the current (A), Δ t is the discharge time (s), and Δ U is the operating discharge potential range (V). The specific capacitance C sp (F/g) of the asymmetric supercapacitor was calculated from

C_{sp} = \frac{4 C}{m}

where m (g) is the total mass of Mn 5 O 9 and FeOOH.…”

Section: Methodsmentioning

confidence: 99%

“…Transition metal oxides are widely used as active materials for electrochemical energy storage . Among these transition metal oxides, manganese oxides (Mn x O y ) and iron oxides (Fe x O y ) possess low cost, abundant resource, and eco‐friendliness .…”

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confidence: 99%

A Flexible Aqueous Asymmetric Lithium‐Ion Supercapacitor with High Voltage and Superior Safety

Liu

Wang

et al. 2019

Energy Tech

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Achieving high voltage and safety simultaneously in energy storage devices can greatly advance the development of flexible and wearable electronics. Thus, flexible aqueous asymmetric lithium‐ion supercapacitors with a high voltage attract the interest of many researchers. Herein, a new flexible aqueous asymmetric lithium‐ion supercapacitor with a high voltage and superior safety is fabricated using manganese oxide and iron hydroxide, which are electrodeposited on carbon cloths as electrodes and a super‐concentrated gel polymer as the electrolyte. Impressively, the flexible asymmetric lithium‐ion supercapacitor delivers a high voltage of 3.2 V, which is a high value in aqueous asymmetric supercapacitors. Moreover, the asymmetric supercapacitor exhibits a specific capacitance of 227.6 F g−1, a maximum energy density of 49.3 Wh kg−1, and a maximum power density of 11.5 kW kg−1, together with a capacitance retention of 82% after 1000 cycles at a current density of 2 A g−1. Importantly, the supercapacitor can keep good electrochemical performance under extremely harsh conditions, such as compressing, hammering, punching, and tailoring, which demonstrates superior safety.

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“…Díaz et al [15] has shown Co-based MOF as a promising electrode material for energy storage systems due to its high surface area of 2900 m 2 g À 1 according to Langmuir model. It has been shown that the lower conductivities and higher redox interactions of the metal organic frameworks can be counteracted by the introduction of carbon-based materials such as carbon-nanotubes [15], activated carbon [16] as well as graphene oxide materials [17].…”

Section: Introductionmentioning

confidence: 99%

Interrogation of Electrochemical Performance of Reduced Graphene Oxide/Metal‐organic Framework Hybrid for Asymmetric Supercabattery Application

et al. 2020

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Large scale energy storage system with low cost, high power, and long cycle life is crucial for addressing the energy crisis, especially when integrated with renewable energy resources. To realize grid-scale applications of the energy storage devices, there remain several key issues including the development of low-cost, highperformance materials that are environmentally friendly. This study explores the synergic contribution of the reduced graphene oxide (rGO) on metal organic framework (MOF) as positive electrode for asymmetric supercabattery. The structural elucidation of the synthesised hybrid material and its precursors were characterised using XRD, FTIR, TGA, SEM and TEM. The electrochemical analysis of the synthesised hybrid material and its precursors was achieved using CV, GCD and EIS. The electrochemical behaviour of NF-rGO/MOF hybrid obtained from the three-electrode system exhibited a battery-type behaviour and accomplished an improved specific capacity of 459.0 Cg À 1 at the current density of 1.5 A g À 1. Furthermore, the two-electrode system fabricated in an asymmetric configuration made of NF-rGO/ MOF hybrid as the positive electrode and activated carbon (AC) as the negative electrode studied in 3.0 M KOH electrolyte, exhibited specific capacity of about 48.81 Cg À 1 at the current density of 0.4 A g À 1 , the corresponding maximum energy density of 11.0 Wh kg À 1 and the maximum power density of 640.45 W kg À 1. The cycling stability of the rGO/MOF hybrid asymmetric device displayed 70 % capacity retention after 2000 cycles.

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High-performance Mn3O4/onion-like carbon (OLC) nanohybrid pseudocapacitor: Unravelling the intrinsic properties of OLC against other carbon supports

Cited by 66 publications

References 77 publications

Rapid Production of Mn3O4/rGO as an Efficient Electrode Material for Supercapacitor by Flame Plasma

Rapid Production of Mn3O4/rGO as an Efficient Electrode Material for Supercapacitor by Flame Plasma

A Flexible Aqueous Asymmetric Lithium‐Ion Supercapacitor with High Voltage and Superior Safety

Interrogation of Electrochemical Performance of Reduced Graphene Oxide/Metal‐organic Framework Hybrid for Asymmetric Supercabattery Application

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