Abstract
The electrochemical reduction of Bi 3+ in molten AlCl 3 + NaCl (63–37 ∼52−48 mole%) has been studied polarographically (polarograms were constructed from current-time curves) as well as by linear sweep voltammetry and chronopotentiometry at gold, platinum, and pyrolytic graphite electrodes in the temperature interval 125–300°C. Bi 3+ is reduced reversibly to Bi +. Further reduction of Bi + to bismuth is complex and involves intermediate oxidation states which were not characterized electrochemically. Strong adsorption of Bi + at gold and platinum electrodes was observed; adsorption parameters are reported. The lower oxidation states were found to be more stable at lower temperature and in more acidic melts (higher AlCl 3 content).
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