Paper Titles
Analysis of Chromosome Lesions in Women with Benign Breast Diseases, Residing in the Territories Contaminated as a Result of the Chernobyl Accident
p.680
A New Distance Relaying Method with System Load Condition Considered in a Transmission Line
p.686
A Novel Protective Effectiveness Evaluation Method Based on a Parametric Point of View for Distribution Systems
p.692
Tritium Application: Self-Luminous Glass Tube (SLGT)
p.698
Amorphous Manganese Dioxide as a Material for an Electrochemical Pseudocapacitor
p.703
Structural and Catalytic Properties of the Alkali Metal Ion-Exchanged Y-Zeolites by 29Si and 27Al Solid-State NMR and FT-IR Spectroscopy
p.708
Physical and Catalytic Properties of the Na-Exchanged Y-Zeolites with Different Si/Al Ratios
p.720
Optimal Design of an Energy Efficient Vacuum Furnace Using Thermal Analysis Database
p.732
Assessment of WIMS-D5 Applicability to CANDU NPPs
p.741

Amorphous Manganese Dioxide as a Material for an Electrochemical Pseudocapacitor

Article Preview

Abstract:

The charge storage process of amorphous hydrated manganese dioxide (MnO2) as a pseudo-capacitor involves a fast redox reaction at the electrode surface. In order to understand the charge storage mechanism of MnO2 as a pseudo-capacitor in an aqueous KCl solution, we monitored the change of the capacitance by varying the pH of the solution, the cation of the electrolyte, the concentration of the KCl electrolyte, and the solvent. The charge storage mechanism of a metal oxide electrode such as MnO2 is concluded to involve a fast redox reaction through both the potassium ion exchange, MnO2 + δK+ + δe- ⇔ MnO2-δ(OK)δ and the proton exchange, MnO2 + δH+ + δe- ⇔ MnO2-δ(OH)δ dependent upon the availability of the cations in the electrolyte.

You might also be interested in these eBooks
On the Convergence of Bio-, Information-, Enrivonmental-, Energy-, Space- and Nano-Technolgies View Preview

Info:

Periodical:

Key Engineering Materials (Volumes 277-279)

Pages:

703-707

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.277-279.703

Citation:

Cite this paper

Online since:

January 2005

Authors:

Sun Wen, In Hyeong Yeo, Jong Man Park, Sun Il Mho

Keywords:

Amorphous MnO2, Charge-Storage Mechanism, Electrochemical Capacitor

Export:

RIS, BibTeX

Price:

Permissions CCC:

Request Permissions

Permissions PLS:

Request Permissions

Сopyright:

© 2005 Trans Tech Publications Ltd. All Rights Reserved

Share:

Citation:

References

[1] B.E. Conway, J. Electrochem. Soc. 138 (1991) 1539.

Google Scholar

[2] B.E. Conway, Electrochemical Supercapacitors, Kluwer-plenum, New York, (1999).

Google Scholar

[3] D. Michell, D.A.J. Rand, R. Woods, J. Electroanal. Chem. 89 (1978) 11.

Google Scholar

[4] J.P. Zheng, T.R. Jow, J. Electrochem. Soc. 142 (1995) L6.

Google Scholar

[5] T.C. Liu, W.G. Pell, B.E. Conway, Electrochim. Acta 42 (1997) 3541.

Google Scholar

[6] J.P. Zheng, P.J. Cygan, T.R. Jow, J. Electrochem. Soc. 142 (1995) 2699.

Google Scholar

[7] H.Y. Lee, J.B. Goodenough, J. Solid State Chem. 144 (1999) 220.

Google Scholar

[8] H.P. Stadniychuk, M.A. Anderson, T.W. Chapman, J. Electrochem. Soc. 143 (1996) 1629.

Google Scholar

[9] J.J. Xu, A.J. Kinser, B.B. Owens, W.H. Smyrl, Electrochem. Solid-State Lett. 1 (1998) 1.

Google Scholar

[10] Y. Marcus, Ion Properties, Marcel Dekker, New York, (1997).

Google Scholar

[11] J.A. Dean, Lange's Handbook of Chemistry, 14th ed., McGRAW-HILL, New York, 1992, 8. 4.

Google Scholar

[12] W.K. Seong, Ph. D. Dissertation, Ajou University, (2001).

Google Scholar

[13] S.Y. Park, S.I. Mho, E.O. Chi, Y.U. Kwon, I.H. Yeo, Bull. Korean Chem. Soc. 16 (1995) 82.

Google Scholar