Examples



mdbootstrap.com



 
Статья
2000

Electroreduction of oxygen on copper-containing sulfide minerals


M. R. Tarasevich M. R. Tarasevich , G. A. Kudaikulova G. A. Kudaikulova , K. A. Radyushkina K. A. Radyushkina
Российский электрохимический журнал
https://doi.org/10.1007/BF02757795
Abstract / Full Text

The state of the surface of and the oxygen electroreduction on the naturally occurring minerals bornite, chalcopyrite, and chalcosine are studied in borate buffer solutions using X-ray photoelectron spectroscopy, cyclic voltammetry, and the rotating disk electrode technique. The surface of the minerals in an oxygen-containing atmosphere is covered with compounds of copper and iron in the highest oxidation states, and the oxygen electroreduction occurs on these compounds. Electrocatalytic activity of sulfide minerals during cathodic polarization is presumably due to the participation in the oxygen electroreduction reaction of redox centers, i.e. ions of Fe(II) in bornite and chalcopyrite, and ions of Cu(I) bonded with the sulfide sulfur in each of the minerals.

Author information
  • Frumkin Institute of Electrochemistry, Russian Academy of Sciences, Leninskii pr. 31, 117071, Moscow, Russia

    M. R. Tarasevich, G. A. Kudaikulova & K. A. Radyushkina

References
  1. Vigdergauz, V.E. and Radyushkina, K.A.,Povyshenie polnoty i kompleksnosti izvlecheniya tsennykh komponentov pri pererabotke mineral’nogo syr’ya (Increasing the Thoroughness and Completeness of the Extraction of Valuable Components in the Processing of Raw Materials), Moscow: IPKON AN SSSR, 1986, p. 8.
  2. Sisenov, G.K. and Tarasevich, M.R.,Zh. Prikl. Khim. (Leningrad), 1988, vol. 61, p. 1247.
  3. Kudaikulova, G.A., Tarasevich, M.R., and Radyushkina, K.A.,Elektrokhimiya, 1990, vol. 26, p. 1025.
  4. Biegler, T., Rand, D.A., and Woods, R.J.,J. Electroanal. Chem., 1975, vol. 60, p. 151.
  5. Biegler, T., Rand, D.A., and Woods, R.J.,J. Electroanal. Chem., 1976, vol. 70, p. 265.
  6. Pillai, K.C. and Bockris, J.O.M.,J. Electrochem. Soc, 1984, vol. 131, p. 568.
  7. Panzner, G. and Egert, R.,Surface Science, 1984, vol. 144, p. 651.
  8. Nefedov, V.l. and Cherepin, V.T.,Fizicheskie metody issledovaniya poverkhnosti tverdykh tel (Physical Methods of Studying Solid Surfaces), Moscow: Nauka, 1983, p. 33.
  9. Ennaonui, A., Fiechter, S., Jaegermann, W., and Tributch, H.,J. Electrochem. Soc, 1986, vol. 133, p. 97.
  10. Allen, Y.C., Curtis, M.T., Hopper, A.I.,et al., J. Chem. Soc, Dalton Trans., 1974, vol. 14, p. 1525.
  11. Brion, D.,Appl. Surf. Sci., 1980, vol. 5, p. 133.
  12. Wagner, CD., Gale, L.H., and Raymond, B.H.,Anal. Chem., 1979, vol. 51, p. 466.
  13. Nakai, J. and Sugitani, J.,J. Inorg. Nucl. Chem., 1978, vol. 40, p. 789.
  14. Panzner, G., Egert, R., and Schmidt, H.P.,Surf. Sci., 1985, vol. 151, p. 400.
  15. Parker, A.J., Paul, R.L., and Power,G.P.,Austr. J. Chem., 1981, vol. 34, p. 13.
  16. Burstein, G.T. and Newman, R.C.,J. Electrochem. Soc, 1981, vol. 128, p. 2270.