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Mesoporous manganese dioxide prepared under acidic conditions as high performance electrode material for hybrid supercapacitors

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Abstract.
High surface area mesoporous manganese dioxide (MnO2) with a-phase crystalline structure has been
synthesized by the reduction of potassium permanganate with ethylene glycol under acidic conditions.
Nitrogen sorption analyses show that MnO2 synthesized under acidic conditions exhibits a type IV isotherm,
indicating a mesoporous character. Electrochemical performances of MnO2 samples as supercapacitor
electrode materials have been studied in a three-electrode system. A hybrid supercapacitor
based on using a composite material (MnO2&Activated Carbon) as the positive electrode and activated
carbon as the negative electrode has been fabricated. The hybrid supercapacitor fabricated using MnO2
synthesized under acidic conditions has excellent large current charge–discharge performance, and
shows a practical cell voltage of 1.8 V and a capacitance of 22.1 F g1 after 1500 cycles even in the presence
of the dissolved oxygen. MnO2 synthesized in the absence of acid shows poor cycle performance and
a low capacitance.

Keywords: Mesoporous materials, Hybrid supercapacitor, Manganese dioxide, Birnessite, Acid treatment

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Informasi Detail

Judul Seri

Microporous and Mesoporous Materials

No. Panggil

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Penerbit

New York : Elsevier Inc.., 2012

Deskripsi Fisik

Microporous and Mesoporous Materials 153 (2012) 247–253

Bahasa

English

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Tipe Isi

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Tipe Media

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Tipe Pembawa

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Edisi

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Subjek

FISIKA

Info Detail Spesifik

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Pernyataan Tanggungjawab

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