Abstract
The cyclic voltammetry method was used to study the regularities of the electrochemical behavior of cobalt cobaltite in an acidic medium. It is shown that cathodic reduction of Co3O4 in the studied range of potentials of +1.0 to −0.8 V is a multistage process occurring according to the scheme:
In the following anodic half-cycle, formation of the CoO protoxidic phase is continued from such sources as Co3O4 − δ and metallic cobalt. At the potentials to the positive of +0.25 V, the process of absorption of the superstoichiometric oxygen is realized within the region of homogeneity of the CoO1 + δ protoxidic phase. The dependence of the rate of the chemical stage of the process on the potential sweep direction and also a significant increase in the rate of stage II at the second and further electrode polarization cycles was explained within the theory of nucleation and diffusion of charged particles in the electric field.
Similar content being viewed by others
References
Kang, Y.M., Song, M.S., Kim, J.H., Kim, H.S., Park, M.S., Lee, J.Y., Liu, H.K., and Dou, S.X., Electrochim. Acta, 2005, vol. 50, p. 3667.
Lao, Zh.J., Australian Digital Theses Program, 2006.
Haenen, J., Visscher, W., and Barendrecht, E., J. Electroanal. Chem., 1986, vol. 208, p. 273.
Iwakura, C., Honji, A., and Tamura, H., Electrochim. Acta, 1981, vol. 26, p. 1319.
Shalaginov, V.V., Belova, I.D., Roginskaya, Yu.E., and Shub, D.M., Elektrokhimiya, 1978, vol. 14, p. 1708.
Shub, D.M., Chemodanov, A.N., and Shalaginov, V.V., Elektrokhimiya, 1978, vol. 14, p. 595.
Burshtein, R.Kh., Tarasevich, M.R., Khutornyi, A.M., Vilinskaya, V.S., Sabirov, F.Z., Astakhov, I.I., and Teplitskaya, G.L., Elektrokhimiya, 1975, vol. 11, p. 1064.
Trunov, A.M., Presnov, V.A., Uminskii, M.V., Rakityanskaya, O.F., Bakutina, T.S., and Kotseruba, A.I., Elektrokhimiya, 1975, vol. 11, p. 552.
Fetisov, V.B., Kozhina, G.A., Ermakov, A.N., Fetisov, A.V., and Miroshkina, E.G., J. Solid State Electrochem., 2007, vol. 11, p. 1205.
Krtil, P., Fattakhova, D., and Yoshimura, M., J. Solid State Electrochem., 2002, vol. 6, p. 367.
Shobha, T., Aravinda, C.L., Devi, L.G., and Mayanna, S.M., J. Solid State Electrochem., 2003, vol. 7, p. 451.
Scholz, F., J. Electroanal. Chem., 1995, vol. 385, p. 139.
Fletcher, S., Electrochim. Acta, 1983, vol. 28, p. 917.
Chufarov, G.I., Men’, A.N., Balakirev, V.F., Zhuravleva, M.G., and Shchepetkin, A.A., Termodinamika Protsessov Vosstanovleniya Okislov Metallov (Thermodynamics of the Processes of Reduction of Metal Oxides), Moscow: Metallurgiya, 1970.
Tret’yakov, Yu.D., Termodinamika ferritov (Thermodynamics of Ferrites), Leningrad: Khimiya, 1967.
Rode, E.F., Zh. Neorg. Khim., 1956, vol. 1, p. 1430.
Gorichev, I.G. and Kipriyanov, N.A., Zh. Prikl. Khim., 1981, vol. 55, p. 2734.
Lecuire, J.M., J. Electroanal. Chem., 1975, vol. 66, p. 195.
Bokshtein, B.S. and Yaroslavtsev, A.V., Diffuziya atomov i ionov v tverdykh telakh (Atom and Ion Diffusion in Solids), Moscow: MISIS, 2005.
Author information
Authors and Affiliations
Corresponding author
Additional information
Original Russian Text © G.A. Kozhina, A.N. Ermakov, V.B. Fetisov, A.V. Fetisov, K.Yu. Shunyaev, 2009, published in Elektrokhimiya, 2009, Vol. 45, No. 10, pp. 1261–1266.
Rights and permissions
About this article
Cite this article
Kozhina, G.A., Ermakov, A.N., Fetisov, V.B. et al. Electrochemical dissolution of Co3O4 in acidic solutions. Russ J Electrochem 45, 1170–1175 (2009). https://doi.org/10.1134/S1023193509100097
Received:
Published:
Issue Date:
DOI: https://doi.org/10.1134/S1023193509100097