Manganese oxide/graphene oxide composites for high-energy aqueous asymmetric electrochemical capacitors

Jafta, Charl J.; Nkosi, Funeka P.; Roux, Lukas le; Mathe, Mkhulu; Kebede, Mesfin Abayneh; Makgopa, Katlego; Song, Yang; Tong, Dennis; Oyama, Munetaka; Manyala, Ncholu I.; Chen, Shaowei; Ozoemena, Kenneth I.

doi:10.1016/j.electacta.2013.06.096

Cited by 84 publications

(26 citation statements)

References 20 publications

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“…Electrochemical reversibility, availability of an array of oxidation states and higher electrical conductivity are the properties of a material to be selected as a pseudocapacitor electrode. Many transition metal oxides (TMOs) are proposed as candidates for pseudocapacitive electrodes; summary of which are available in recent articles [5][6][7][8][9][10][11][12][13][14]. Among them, compounds of cobalt offer superior performance than other binary metal oxides although they are expensive due to its lower abundance in the earth's crust (<10 ppm).…”

Section: Introductionmentioning

confidence: 99%

Characterization of MgCo2O4 as an electrode for high performance supercapacitors

Krishnan

Reddy

Harilal

et al. 2015

Electrochimica Acta

317

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Section: Introductionmentioning

confidence: 99%

Characterization of MgCo2O4 as an electrode for high performance supercapacitors

Krishnan

Reddy

Harilal

et al. 2015

Electrochimica Acta

317

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“…10 There have been extensive studies of varieties of carbon materials for supercapacitor electrodes because of their large specific surface area (SSA), high conductivity, facile availability, and chemical stability. 5,11 Some of the best performing carbon materials include activated carbon, 12 carbon nanotubes (CNTs), 13 graphene, 14,15 carbon nanofibers (CNFs), 16,17 and carbon aerogels. 18 Among carbon nanomaterials, non-porous carbon onions, also known as onion-like carbon (OLC), have attracted major research interests as electrode material for energy storage, for example, advanced anode electrodes for lithium ion batteries, 19,20 pseudocapacitors, 21,22 and ultrahigh-power electric double-layer capacitors.…”

Section: Introductionmentioning

confidence: 99%

A high-rate aqueous symmetric pseudocapacitor based on highly graphitized onion-like carbon/birnessite-type manganese oxide nanohybrids

et al. 2015

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We present a study on the pseudocapacitive properties of birnessite-type MnO 2 grafted on highly graphitized onion-like carbon (OLC/MnO 2 ). In a three-electrode setup, we evaluated two different substrates, namely a platinum disc and nickel foam. The OLC/MnO 2 nanohybrid gave large specific capacitance (C sp ) of 295 and 323 F g -1 (at 1 A g -1 ) for the Pt disc and Ni foam, respectively. In addition, the Ni foam substrate exhibited much higher rate capability (power density) than the Pt disc. A symmetrical two-electrode device, fabricated with the Ni foam, showed a large C sp of 254 F g -1 , specific energy density of 5.6 Wh kg -1 , and a high power density of 74.8 kW kg -1 . These values are the highest for onion-based electrodes so far. The device showed excellent capacity retention when subjected to voltage-holding (floating) experiments for 50 h. In addition, the device showed low equivalent distributed resistance (EDR ≈ 3 Ω cm 2 ) with very short time constant (τ = 40 ms). This high rate handling ability of the OLC/MnO 2 nanohybrid, compared to literature reports, promises new opportunities for the development of aqueous-based pseudocapacitors.

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“…The shape of the discharge curves does not show the characteristic profile of a pure double layer capacitor, but mainly pseudocapacitance. The slope of the charge/discharge curves indicates the potential dependent nature of the Faradaic reaction [46].…”

Section: Galvanostatic Charge-discharge Analysismentioning

confidence: 99%

Electrochromic and electrochemical capacitive properties of tungsten oxide and its polyaniline nanocomposite films obtained by chemical bath deposition method

Nwanya

Jafta

Ejikeme

et al. 2014

Electrochimica Acta

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Polyanine and its nanocomposite WO 3 /PANI films were deposited on Fluorine doped tin oxide (FTO) glass slides by simple Chemical Bath Deposition Method. The morphology and crystalline structure of the composite film was studied using Atomic force (AFM) and Scanning Electron Microscopy, while the electrochemical capacitive properties were determined using Cyclic Voltammetry (CV), chronopotentiometry (CP) and electrochemical impedance spectroscopy (EIS). The WO 3 / PANI nano-composite exhibited multiple colors (electrochromism) during the CV scans, from brownish green to transparent to light green then back to brownish green. Surprisingly, the integration of the PANI with the WO 3 led to synergistic performance of nanohybrid wherein a true electrochemical double layer capacitor was obtained. Also, interestingly and unlike literature reports, the CBD method led to excellent capacitance retention (> 98%) of the PANI even at 1000 continuous cycles. This work demonstrates that simple CBD can be used to get WO 3 / PANI films that give good electrochromism and pseudocapacitance comparable to the ones obtained by other methods. Hence the obtained nanocomposite film of WO 3 / PANI can be a promising material for electrochromic and energy storage applications.

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Manganese oxide/graphene oxide composites for high-energy aqueous asymmetric electrochemical capacitors

Cited by 84 publications

References 20 publications

Characterization of MgCo2O4 as an electrode for high performance supercapacitors

Characterization of MgCo2O4 as an electrode for high performance supercapacitors

A high-rate aqueous symmetric pseudocapacitor based on highly graphitized onion-like carbon/birnessite-type manganese oxide nanohybrids

Electrochromic and electrochemical capacitive properties of tungsten oxide and its polyaniline nanocomposite films obtained by chemical bath deposition method

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