Abstract
The diffusion of copper in hexagonal chalcocite (Cu2S) is not very well-known. In this work electrochemical cells with natural polycrystalline chalcocite working electrodes have been studied by electrochemical impedance spectroscopy (EIS) over a large frequency range at equilibrium potential. To study this phenomenon between 120 and 160°C a solid electrolyte RbCu4Cl5 has been used. The impedance spectra present two distinct regions. At high frequencies the general shape of the diagram in the Nyquist plane is a depleted are of a circle. Changes in electrolyte resistance, interfacial capacitance and transfer resistance have been studied as a function of temperature. At low frequencies, a diffusion impedance is observed attributed to the mobility of copper vacancies. Diffusion coefficients, with an activation energy of 1.7 eV, have been deduced from the impedance diagrams (4.7·10−5cm2 s−1 at 130°C). These results are compared with those obtained with orthorhombic chalcocite between 30 and 60 °C by EIS and using an electrochemical cell with a cupric liquid electrolyte.
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Pauporté, T., Vedel, J. An electrochemical study of copper diffusion in non-stoichiometric copper sulphide. Ionics 2, 241–247 (1996). https://doi.org/10.1007/BF02376029
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DOI: https://doi.org/10.1007/BF02376029