I built an electrolytic cell. There are an anode plate and a cathode plate. Each plate of 7x12 cm dimension (the width is negligible), and connected to a DC power supply. Moreover, both plates are immersed 4.5 cm in the solution. I want to use these electrodes in electrochemical processes. Please, how can I calculate current density?

I would answer that i = applied current/immersed surface

and that the immersed surface is A=2x7x4.5 cm^2. It is multiplied by two since both the surface directly exposed to counter-electrode and the opposite surface are treated during the process.

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