Application of Metallized Plastic Electrodes for Electrowinning of Metals
It has been shown that a film of electroless Cu on the surface of polyvinyl chloride particles (Cu/PVC) imparts significant electrochemical activity onto the PVC surface. Microscopic inspection revealed adequate adhesion between the Cu-film and the PVC substrate. Particles of Cu/PVC were used as an electrode material for the electrowinning of zinc from alkaline zincate solutions over a temperature range from 30 to 55°C. These particles were used in the form of a packed bed electrode through which the alkaline zincate electrolyte was made to flow. Such a system furnishez extremely high rates of electrowinning (up to 700 mA cm -2 ) which are several-fold greater than those obtainable on planar electrodes. This study compared the Cu/PVC with bulk Cu electrodes in terms of polarization behavior, coulombic efficiency, cell voltage, and power consumption. The Cu/PVC electrode behaved in essentially the same way as the bulk Cu electrode.
KeywordsCell Voltage Coulombic Efficiency Electroless Plating Planar Electrode Zinc Deposition
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