Recycling ZnTe, CdTe, and Other Compound Semiconductors by Ambipolar Electrolysis

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• 作者：David J. Bradwell ; Sebastian Osswald ; Weifeng Wei ; Salvador A. Barriga ; Gerbrand Ceder ; Donald R. Sadoway
• 刊名：Journal of the American Chemical Society
• 出版年：2011
• 出版时间：December 14, 2011
• 年：2011
• 卷：133
• 期：49
• 页码：19971-19975
• 全文大小：827K
• 年卷期：v.133,no.49(December 14, 2011)
• ISSN：1520-5126

文摘

The electrochemical behavior of ZnTe and CdTe compound semiconductors dissolved in molten ZnCl<sub>2sub> and equimolar CdCl<sub>2sub>鈥揔Cl, respectively, was examined. In these melts dissolved Te is present as the divalent telluride anion, Te<sup>2鈥?/sup>, which was found able to be converted to elemental metal by electrochemical oxidation at the anode. ZnTe鈥揨nCl<sub>2sub> melts were studied at 500 掳C by standard electrochemical techniques. On the basis of these results, electrolysis was performed, resulting in the simultaneous extraction of phase-pure liquid Zn at the cathode and phase-pure liquid Te at the anode. This new process, involving the simultaneous deposition of liquid metals at electrodes of opposite polarity, is termed herein as ambipolar electrolysis. A melt consisting of CdTe dissolved in equimolar CdCl<sub>2sub>鈥揔Cl was processed by ambipolar electrolysis, resulting in the production of liquid Cd at the cathode and liquid Te at the anode. Ambipolar electrolysis could enable new approaches to recycling compound semiconductors and semiconductor devices, such as CdTe solar cells.