e-journal

Anomalous effect of K ions on electrochemical capacitance of amorphous MnO2

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Abstract.
Six samples of α-MnO2 with different K ion contents are synthesized by using KMnO4 and
Mn(CH3COO)2$4H2O with different pH values at room temperature. The samples are labeled as Mx where
x denotes the pH value. The anomalous effect of K ion content on the electrochemical capacitance
properties of amorphous MnO2 is investigated systematically. It is found that with the increase of the K ion
content, the MnO2 nanospheres form a more dense aggregates, the surface area dramatically decreases
from 273 (M2) to 14 m2 g
-1 (M12), and pore volume decreases from 0.349 (M2) to 0.014 cm3 g
-1 (M12).
The specific capacitance (SC) is decreased by 17.6% from 157 (M2) to 131 F g
-1 (M12). In addition, the SC
values are greatly influenced by the molar ratio of K to Mn in the range of 0-0.4. And it is found that part
of K ions in the MnO2 tunnels can be replaced by Na ions during electrochemical reaction. Finally, an
appropriate explanation of the effect of K ion content on the SC values is provided.

Keywords: Manganese dioxide, Nanoparticle, K ion, pH, Amorphous, Specific capacitance

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Ketersediaan

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Informasi Detail

Judul Seri

Journal of Power Sources

No. Panggil

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Penerbit

New York : Elsevier B.V.., 2013

Deskripsi Fisik

Journal of Power Sources 234 (2013) 1-7

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

234 (2013)

Subjek

KAPASITOR ELEKTROKIMIA

Info Detail Spesifik

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Pernyataan Tanggungjawab

agus

Versi lain/terkait

Lampiran Berkas

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