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A new asymmetric supercapacitor based on λ-MnO2 and activated carbon electrodes

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A B S T R A C T

Lithium-ion intercalated compound λ-MnO2 was used as positive electrode in asymmetric supercapacitor with
activated carbon used as negative electrode in 1 mol L−1 Li2SO4 aqueous electrolyte solution. Phase composition, morphology and particle sizes of λ-MnO2 were studied by powder X-ray diffraction (XRD) and scanning electron microscopy (SEM). Electrochemical capacitive performance of the asymmetric upercapacitor was tested by cyclic voltammetry and galvanostatic charge–discharge tests. The results show that the asymmetric supercapacitor has electrochemical capacitance performancewithinwide potential range of 0–2.2 V. The specific capacitance is 53 F g−1 at a constant current density of 10mA cm−2. The energy density is 36Wh kg−1 with a power density of 314Wkg−1. It is obvious that λ-MnO2 is a potential electrode material for asymmetric supercapacitor.
Keywords: Crystal structure, X-ray techniques, λ-MnO2, Asymmetrical supercapacitor, Activated carbon,
Aqueous electrolyte

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Informasi Detail

Judul Seri

Materials Letters

No. Panggil

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Penerbit

: Elsevier B.V. All rights reserved., 2008

Deskripsi Fisik

Materials Letters 62 (2008) 3884–3886

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English

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Tipe Media

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Tipe Pembawa

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Edisi

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Subjek

KIMIA

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yuli/agus

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