Abstract
Material characterization of sol-gel-derived and electrodeposited MnO2 thin films showed that their microstructures are highly porous in nature. While sol-gel-derived films are nanoparticulate, electrodeposited films showed macropores of random and irregular platelike structures, comprising much denser surface layers and highly porous underlying layers. On the basis of calculated and theoretical density values of 1 and 4.99 g/cm3, respectively, the porosity of sol-gel-derived MnO2 films was determined to be as high as 80%, which is substantially higher than electrodeposited films at 67%. Apart from their higher specific capacitance, sol-gel-derived MnO2 films appeared to exhibit higher cycling stability and reversibility than electrodeposited MnO2 films. In the case of sol-gel films, thinner films appeared to exhibit higher cycling stability than thicker films. There was less alteration in surface morphology and microstructure, and the rate of loss in charge-storage capacity upon voltammetric cycling was not as significant for sol-gel MnO2 thin films
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S-C. Pang, M.A. Anderson, and T.W. Chapman, J. Electrochem. Soc. 147, 444 (2000).
S-C. Pang and M.A. Anderson, in New Materials for Batteries and Fuel Cells, edited by D.H. Doughty, H-P. Brack, K. Naor, and L.F. Nagan (Mater. Res. Soc. Symp. Proc. 575, Warrendale, PA, 1999), pp. 415–422.
B.D. Desai, J.B. Fernandes, and V.N. Kamat Dalal, J. Power Sources 16, 1 (1985).
P. Ruetschi and R. Giovanoli, J. Electrochem. Soc. 135, 2663 (1988).
Era, A. Takehara, and S. Yoshizawa, Electrochim. Acta 12, 1199 (1967).
A. Kozawa and R.A. Powers, J. Electrochem. Soc. 113, 870 (1966).
C.H. Lee, E. Yeager, and B.D. Cahan, In Proceeding of the Manganese Dioxide Symposium, Vol. 1, edited by A. Kozawa and R.J. Brodd (I.C. Sample Office, OH, 1975), Paper 18, p. 349.
J.P. Zheng, J. Huang, and T.R. Jow, J. Electrochem. Soc. 144, 2026 (1997).
S. Sarangapani, B.V. Tilak, and C.P. Chen, J. Electrochem. Soc. 143, 3791 (1996).
S. Sarangapani, P. Lessner, J. Forchione, A. Griffith, and A.B. Laconti, J. Power Sources 29, 355 (1990).
J.P. Zheng, P.J. Cygan, and T.R. Jow, J. Electrochem. Soc. 142, 2699 (1995).
J.P. Zheng and T.R. Jow, J. Electrochem. Soc. 142, L6 (1995).
K.C. Liu and M.A. Anderson, in Aqueous Chemistry and Geochemistry of Oxiclear, Oxyhydroxides, and Related Materials, edited by J.A. Voight, T.E. Wood, B.C. Bunker, W.H. Casey, and L.H. Crossey (Mater. Res. Soc. Symp. Proc. 432, Pittsburgh, PA, 1996), pp. 221–229.
Paul Mulvaney, R. Cooper, and F. Grieser, J. Phys. Chem. 94, 8339 (1990).
J.Z. Sostaric, P. Mulvaney, and F. Grieser, J. Chem. Soc., Faraday Trans. 91, 2843 (1995).
D. Tench and L.F. Warren, J. Electrochem. Soc. 130, 869 (1983).
A.A. Spricis, G.J. Slaidins, J.J. Abele, and J.R. Dzelme, Elecktrokhimiya 18, 399 (1982).
J.L. Ord and Z.Q. Huang, J. Electrochem. Soc. 132, 1183 (1985).
B.L. Wu, D. Linot, J. Vedel, and L.T. Yu, J. Electroanal. Chem. 420, 159 (1997).
B.A. Lopez De Mishima, T. Ohtsuka, H. Konno, and N. Sato, Electrochim. Acta 36, 1485 (1991).
B.A. Lopez De Mishima, T. Ohtsuka, H. Konno, and N. Sato, Electrochim. Acta 38, 341 (1993).
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Pang, SC., Anderson, M.A. Novel electrode materials for electrochemical capacitors: Part II. Material characterization of sol-gel-derived and electrodeposited manganese dioxide thin films. Journal of Materials Research 15, 2096–2106 (2000). https://doi.org/10.1557/JMR.2000.0302
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DOI: https://doi.org/10.1557/JMR.2000.0302