The Standard Rate Constants of Charge Transfer for the Cr(Ⅲ)/Cr(Ⅱ) Couple in NaCl-KCl-CrCl_3 and NaCl-KCl-K_3CrF_6 Molten Salts

摘要

Cyclic voltammetry was used to determine standard rate constants of charge transfer at a glassy-carbon electrode for the Cr(Ⅲ)/Cr(Ⅱ) redox couple in the NaCl-KCl-CrCl_3 and NaCl-KCl-K_3CrF_6 systems in the temperature range of 973-1173 K. It has been demonstrated that k_s increases with temperature increase. The activation energies during the chromium ions recharging have been calculated. The obtained results are explained from the standpoint of complexation in molten salts.