Russian Journal of Electrochemistry

, Volume 37, Issue 10, pp 1065–1071 | Cite as

Charge Accumulation in Nanoheterogeneous Iridium Oxide Films

  • Yu. E. Roginskaya
  • M. D. Gol'dshtein
  • O. V. Morozova
  • L. D. Glazunova


Iridium oxide films with different values of crystallinity degree K are synthesized. Properties of the films and their morphological features are examined. The charging of the films in a 1 M H2SO4solution is studied voltammetrically. The most amorphous films (K = 0.08–0.26) acquire the largest overall charge q(in a fixed potential range) relative to films with higher crystallinity degrees; however, the qvs. K dependence is not additive, and the charge remains virtually invariant beginning with K ≥ 0.26. The contribution of slow charging processes, which is quite perceptible in the amorphous films, is absent in samples with higher crystallinity degrees, which have faster charge kinetics. The fast charging processes, which are not limited by diffusion, occur in boundary regions of IrO2crystallites (and/or the “oxide” part of a crystalline hydrated iridium oxide) and the amorphous phase. The transport of charge-compensating ions in the boundary regions occurs without considerable complications, as in the loose network of amorphous phase IrO2· xH2O. The assumption about the formation of a “metallic” highly-conducting IrO2cluster at K ≥ 0.26 is substantiated. The cluster rules out large resistances in the course of charge transport, which is a possible reason for the slow charging of amorphous films with K < 0.26.


Amorphous Phase Iridium Boundary Region IrO2 Charge Process 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. 1.
    Michell, D., Rand, D.A.J., and Woods, R., J. Electroanal. Chem., 1977, vol. 84, p. 1177.Google Scholar
  2. 2.
    McIntyre, J.D.E., Basu, S., Peck, W.F., et al., Phys. Rev. B: Condens. Matter, 1982, vol. 25, p. 7242.Google Scholar
  3. 3.
    Mozota, J. and Conway, B.E., Electrochim. Acta, 1983, vol. 28, p. 9.Google Scholar
  4. 4.
    Trasatti, S. and Kurzweil, P., Platinum Met. Rev., 1994, vol. 38, p. 46.Google Scholar
  5. 5.
    Tsirlina, G.A., Roginskaya, Yu.E., Postovalova, G.G., and Vasil'ev, S.Yu., Elektrokhimiya, 1999, vol. 35, p. 1380.Google Scholar
  6. 6.
    Kavan, L., Kratochvilova, K., and Grätzel, M., J. Electroanal. Chem., 1995, vol. 394, p. 93.Google Scholar
  7. 7.
    Hagfeld, A., Vlachopoulos, N., and Grätzel, M., J. Electrochem. Soc., 1994, vol. 141, p. 82.Google Scholar
  8. 8.
    Electrodes of Conductive Metallic Oxides, Trasatti, S., Ed., Amsterdam: Elsevier, 1980, 1981, parts A, B.Google Scholar
  9. 9.
    Murakami, Y., Miva, K., Ueno, M., et al., J. Electrochem. Soc., 1994, vol. 141, p. L118.Google Scholar
  10. 10.
    Roginskaya, Yu.E. and Morozova, O.V., Electrochim. Acta, 1995, vol. 40, p. 9.Google Scholar
  11. 11.
    Belova, I.D., Varlamova, T.V., et al., Mater. Chem. Phys., 1988, vol. 20, p. 39.Google Scholar
  12. 12.
    Kitaigorodskii, A.I., Rentgenostrukturnyi analiz melkokristallicheskikh i amorfnykh tel (X-ray Diffractometry of Fine-Crystal and Amorphous Solids), Moscow: Gostekhizdat, 1952, p. 224.Google Scholar
  13. 13.
    Temkin, M.I., Zh. Fiz. Khim., 1955, vol. 29, p. 1610.Google Scholar
  14. 14.
    Ardizzone, S., Caguratti, A., and Trasatti, S., J. Electroanal. Chem., 1981, vol. 126, p. 287.Google Scholar
  15. 15.
    Augustinsky, J., Koudelka, M., and Conway, B.E., J. Electroanal. Chem., 1984, vol. 160, p. 233.Google Scholar
  16. 16.
    Burke, L.D. and Murphy, O.J., J. Electroanal. Chem., 1979, vol. 96, p. 19.Google Scholar
  17. 17.
    Glarum, S.H. and Marshall, J.H., J. Electrochem. Soc., 1980, vol. 127, p. 1467.Google Scholar
  18. 18.
    Ardizzone, S., Fregonara, G., and Trasatti, S., Electrochim. Acta, 1990, vol. 35, p. 263.Google Scholar
  19. 19.
    Aurian-Blajeni, B., Beebe, X., Rauh, R.D., and Rose, T.L., Electrochim. Acta, 1989, vol. 34, p. 795.Google Scholar
  20. 20.
    Feder, J., Fractals, New York: Plenum, 1988.Google Scholar

Copyright information

© MAIK “Nauka/Interperiodica” 2001

Authors and Affiliations

  • Yu. E. Roginskaya
    • 1
  • M. D. Gol'dshtein
    • 1
  • O. V. Morozova
    • 1
  • L. D. Glazunova
    • 1
  1. 1.Russian Federation Scientific Center“Karpov Research Institute of Physical Chemistry,”MoscowRussia

Personalised recommendations