caa a22 4500 477048773 CHVBK 20180405111337.0 cr unu---uuuuu 170330e19960101xx s 000 0 eng 10.1007/BF00248195 doi (NATIONALLICENCE)springer-10.1007/BF00248195 Kinetics and mechanism of the Al( iii )/Al electrode reaction in cryolite-alumina melts [Elektronische Daten] [J. Thonstad, A. Kisza, J. Kazmierczak] Using the relaxation method (RM) with galvanostatic perturbation and electrochemical impedance spectroscopy (EIS), exchange current densities and activation parameters were determined for the electrode reaction on the aluminium electrode in pure cryolite melt and in cryolite-alumina melts with the addition of 2-12 wt % Al2O3. In all these melts a three step electrode process was observed, comprising a preceding chemical reaction followed by two charge transfer steps. The exchange current densities for two charge transfer steps were determined as a function of temperature, together with the equilibrium constant of the preceding chemical reaction and its kinetic and diffusion impedance. The third step was found to be independent of diffusion and of the concentration of alumina, whereas the second step showed mixed characteristics. The exchange current densities were of the order of 5-15 A cm−2. Chapman & Hall, 1996 Thonstad J. Department of Electrochemistry, NTH, University of Trondheim, 7034, Trondheim, Norway aut Kisza A. Institute of Chemistry, University of Wroclaw, 50-383, Wroclaw, Poland aut Kazmierczak J. Institute of Chemistry, University of Wroclaw, 50-383, Wroclaw, Poland aut Journal of Applied Electrochemistry Kluwer Academic Publishers 26/1(1996-01-01), 102-112 0021-891X 26:1<102 1996 26 10800 https://doi.org/10.1007/BF00248195 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00248195 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Thonstad J. Department of Electrochemistry, NTH, University of Trondheim, 7034, Trondheim, Norway aut NATIONALLICENCE 700 1- Kisza A. Institute of Chemistry, University of Wroclaw, 50-383, Wroclaw, Poland aut NATIONALLICENCE 700 1- Kazmierczak J. Institute of Chemistry, University of Wroclaw, 50-383, Wroclaw, Poland aut NATIONALLICENCE 773 0- Journal of Applied Electrochemistry Kluwer Academic Publishers 26/1(1996-01-01), 102-112 0021-891X 26:1<102 1996 26 10800 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer