Electrochemistry of tellurium(IV) in KCl−AlCl3 melts |
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Authors: | Finn W Poulsen Niels J Bjerrum |
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Institution: | Chemistry Department A, Technical University of Denmark, DK-2800 Lyngby (Denmark) |
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Abstract: | The reduction of Te(IV) at tungsten electrodes in basic and neutral KCl?AlCl3 melts has been studied in the temperature range from 300 to 400°C using cyclic voltammetry and differential pulse polarography. In basic melts Te(IV), present as TeCl62? and TeCl5?, is reduced to soluble Te(II) species, which can be further reduced to elementary tellurium insoluble in tungsten. The divalent species are stabilized by increasing the temperature. From the pCl? dependence of the reduction process, Te(II) in basic melts is suggested to be present as TeCl3? and TeCl2. In neutral melts a third oxidation state (possibly monovalent tellurium) is formed when Te(II) is reduced. |
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