Discussion Forum

Hi all,

I am trying to set up an electrochemical cell in Comsol 4.4 using the transport of diluted series. The setup is basically just 2 electrodes and between them I want to apply an AC voltage and measure current responses in different geometries. I can do this with just the transport of diluted species and electrostatics modules.

The problem is for what I want next, I want to be able to add fixed capacitance and resistive components in series with the system. To do this I was thinking of using the electrical circuits and simply instead of applying an electric potential and ground at my 2 electrodes using electrostatics, I would use the circuit module and have terminals at my electrodes as well. The problem is, when I add resistors into my circuits at each terminal, they are making no difference to the potential and currents I am seeing. On one electrode I have a terminal and then I have:

Ground node 0
Voltage Source 1-0
External I Vs U 1 2-1
Resistor 1 0-2

and then at my grounded electrode I have a second terminal and:

External I vs U 2 3-0
Resistor 2 0-3

For some reason I haven't quite grasped, when I solve this system for different resistances applied to Resistor 1 it is not having an impact on the potential applied to chemical system, all I am seeing is the voltage I am applying at the voltage source. I am not really used to the circuit module so I could be doing something obviously wrong but from looking at example models this seems to be how others apply resistances and capacitors to other systems.

Any help would be greatly appreciated.