Journal of Applied Science and Engineering

Published by Tamkang University Press

1.30

Impact Factor

2.10

CiteScore

Chein-Ho Huang This email address is being protected from spambots. You need JavaScript enabled to view it.1, Wen-Yung Shu2 , Hsien-Ming Wu2 , Hsiou-Jeng Shy2 and Shirley C. Wei3

1Chemistry Department, Soochow University, Taipei, Taiwan 111, ROC
2Materials & Electro-Optics Research Division of Chung-Shan Institute of Science and Technology, Lung-Tan, Taiwan, ROC
3Poliyen Company, Hershey, PA, USA


 

Received: June 20, 2007
Accepted: April 28, 2008
Publication Date: December 1, 2008

Download Citation: ||https://doi.org/10.6180/jase.2008.11.4.01  


ABSTRACT


The conductivity of manganese dioxide obtained through pyrolysis of manganese nitrate solution was enhanced by the presence of ammonium nitrate. During the pyrolysis process ammonium nitrate generated oxidizing gases which reduced the amount of Mn(II) and Mn(III) (manganese sesquioxide) homogeneously in the pyrolytic product. Thus, the purity and the composition uniformity of the pyrolytic product were improved. Moreover, the BET surface area of the pyrolytic products obtained from most manganese solutions also decreased by the presence of ammonium nitrate. Consequently, pyrolytic manganese dioxide having high conductivity and solid tantalum capacitor exhibiting better characteristics were obtained.


Keywords: Conductivity, Manganese Dioxide, Pyrolysis


REFERENCES


  1. [1] Ruetschi, P., “Cation-Vacancy Model for MnO2,” J. Electrochem. Soc., Vol. 131, pp. 27372744 (1984).
  2. [2] Gotoh, T., Abe, F., Ishizu, T. and Yoshio, M., “Effect of the Addition of Silver Compoinds During the Pyrolysis of Manganese Nitrate on Tantalum Anodic Oxide Film,” J. Power Sources, Vol. 60, pp. 193196 (1996).
  3. [3] Preisler, E., “Electrodeposited Manganese Dioxide with Preferred Crystal Growth,” J. Appl. Electrochem., Vol. 6, pp. 301310 (1976).
  4. [4] Klose, P. H., “Electrical Properties of Manganese Dioxide and Manganese Sesquioxide,” J. Electrochem. Soc., Vol. 117, pp. 854858 (1970).
  5. [5] Li, W. S., Jiang, L. C. and Huang, Z. T., “Preparation of Manganese Dioxide Using Ag+ Ions as an Electrocatalyst,” J. Power Sources, Vol. 69, pp. 8187 (1997).
  6. [6] Inazu, K., Kitahara, M. and Aika, K., “Decomposition of Ammonium Nitrate in Aqueous Solution Using Supported Platinum Catalysts,” Catalysis Today, Vol. 9395, pp. 263271 (2004).
  7. [7] Gassa, L. M., Mishima, H. T., Lppez, B. A., Mishima, De and Vilche, J. R., “An Electrochemical Impedance Spectroscopy Study of Electrodeposited Manganese Oxide Films in Borate Buffers,” Electrochimica Acta., Vol. 42, pp. 17171723 (1997).
  8. [8] Preisler, E., “Semiconductor Properties of Manganese Dioxide,” J. Appl. Electrochem., Vol. 6, pp. 311320 (1976).
  9. [9] Hahn, R. S., Melody, B. J., Kinard, J. T. and Wheeler, D. A., “Thermal Treatment Process for Value Metal Nitride Electrolytic Capacitors having Manganese Oxide Cathodes,” U.S. Patent, 6, 214, 271 (2001).
  10. [10] Nartey, V. K., Binder, L. and Huber, A., “Production and Characterisation of Titanium Doped Electrolytic Manganese Dioxide for Use in Rechargeable Alkaline Zinc/Manganese Dioxide Batteries,” J. Power Sources, Vol. 87, pp. 205211 (2000).
  11. [11] Schlorb, H., Bungs, M. and Plieth, W., “Synthesis and Electrochemical Studies of Manganese Oxides with Spinel Structure in Aqueous Electrolyte (9M KOH),” Electrochemica Acta, Vol. 42, pp. 26192625 (1997).
  12. [12] Walanda, D. K., Lawrance G. A. and Donne, S. W., “Hydrothermal MnO2: Synthesis, Structure, Morphology and Discharge Performance,” J. Power Sources, Vol. 139 pp. 325341 (2005).
  13. [13] Abbas, H. and Nasser, S. A., “Hydroxyl as a Defect of the Manganese Dioxide Lattice and its Applications to the Dry Cell Battery,” J. Power Sources, Vol. 58, pp. 1521 (1996).
  14. [14] Kuwabara, K., Hanafusa, K. and Sugiyama, K., J. Electrochem. Soc., “MnO2 for Solid Electrolyte Cells,” Vol. 136, pp. 319323 (1989).
  15. [15] Qu, D., “Investigation of the Porosity of Electrolytic Manganese Dioxde and its Performance as Alkaline Cathode Material,” J. Power Sources, Vol. 156, pp. 692699 (2006).


    



 

2.1
2023CiteScore
 
 
69th percentile
Powered by  Scopus

SCImago Journal & Country Rank

Enter your name and email below to receive latest published articles in Journal of Applied Science and Engineering.