grain distribution is such that porosity can be observed throughout the film. Such an observation supports low current efficiency. It hasbeen already reported that electrolysis of cupric chloride causes corrosion of copper cathode and causes precipitation of CuCl [23].
Although the reduction in current efficiency associated with ferricand cupric ions is expected, it is useful to note that reasonable cur-rent efficiencies are achievable without the use of a diaphragm cellor anode bags. In an industrial application, electrolyte flow con-trol or separation of anolyte and catholyte would result in greaterefficiencies.