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Dual functions of activated carbon in a positive electrode for MnO2-based hybrid supercapacitor

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Abstract.
Utilizing the dual functions of activated carbon (AC) both as a conductive agent and an active substance
of a positive electrode, a hybrid supercapacitor (AC-MnO2&AC) with a composite of manganese dioxide
(MnO2) and activated carbon as the positive electrode (MnO2&AC) and AC as the negative electrode
is fabricated, which integrates approximate symmetric and asymmetric behaviors in the distinct parts
of 2V operating windows. MnO2 in the positive electrode and AC in the negative electrode together
form a pure asymmetric structure, which extends the operating voltage to 2V due to the compensatory
effect of opposite over-potentials. In the range of 0–1.1 V, both AC in the positive and negative electrode
assemble as a symmetric structure via a parallel connection which offers more capacitance and less
internal resistance. The optimal mass proportions of electrodes are calculated though a mathematical
process. In a stable operating window of 2 V, the capacitance of AC-MnO2&AC can reach 33.2 F g−1. After
2500 cycles, maximum energy density is 18.2Whkg−1 with a 4% loss compared to the initial cycle. The
power density is 10.1kWkg−1 with an 8% loss.

Keywords:
Hybrid supercapacitor
Aqueous electrolyte
Positive electrode
Activated carbon
Manganese dioxide

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Informasi Detail

Judul Seri

Journal of Power Sources

No. Panggil

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Penerbit

New York : Elsevier B.V.., 2011

Deskripsi Fisik

Journal of Power Sources 196 (2011) 4095–4101

Bahasa

English

ISBN/ISSN

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Klasifikasi

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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

KIMIA MATERIAL

Info Detail Spesifik

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Pernyataan Tanggungjawab

agus

Versi lain/terkait

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