Abstract
This paper describe the electrolytic production of hydrogen using packed bed electrodes of metallized plastic. Particles or screens of polyvinyl chlorides (PVC) were metallized by chemically deposited copper or silver and used to fabricate packed bed electrodes. These electrodes were used for the electrolysis of flowing alkaline solutions under different conditions of electrolyte concentration and temperature. The matrix resistivity of the packed bed electrodes was found to influence their polarization behaviour. This resistivity decreased by further electroplating of the packed bed with Ag, Ni or Pd. The effects of these electrocatalytic materials on the polarization of the hydrogen evolution reaction were evaluated and analysed. The electrocatalytic activity of the electrodes used in this study was in the order: Pd/Cu/PVC≅Ni/Cu/PVC > Ag/Cu/PVC > Cu/PVC. These electrodes showed excellent metallic conductivity with good chemical and mechanical stabilities.
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