When generating the polarization (I–V) curve from Fluent simulations, is it recommended to use the I_cathode from the fluent console, or the area-averaged current density at the cathode terminal surface (i.e., current collector) or the area-averaged current density between catalyst and membrane or other area?
From my understanding and simulation results, I_cathode reported in the Fluent console reflects the integrated electrochemical reaction current, whereas the terminal surface current density appears significantly lower. However, I noticed some variations in interpretation across tutorials and would be grateful to know the officially recommended approach for best practice and experimental comparability.
Thank you in advance for your time and guidance. I sincerely appreciate your contribution to this field and your support to students like myself. You can ask additional info if needed.
Warm regards, Teuku Naufal
After each run, read the console (like in your image):
iniCopyEditI_anode = 0.11805 (A/cm²) V_cell = 0.63000 (V)
Log these values into a table or spreadsheet. or ; Initialize
/file/read-case "pemfc.cas"
/solve/initialize/initialize-flow
; Set voltage, run simulation, log output
(define (run-at-voltage v)
(rp-var-define 'pemfc-cell-voltage v)
/solve/iterate 500
(display (format #f "~%V_cell = ~A, I_anode = ~A~%" v (rp-get-var 'pemfc-anode-current-density)))
)
(run-at-voltage 0.95)
(run-at-voltage 0.90)
(run-at-voltage 0.85)
(run-at-voltage 0.80)
...
@Khadersab Adamsab , I want to clarify I know that I need to obtain multiple current density value by changing the voltage and then plotting it to IV curve. What Im not sure is what current density in fluent is used for the plot, there is the I_cathode and I_anode at the console, however I seen tutorial where they used the current density at the cathode terminal (current collector), there also publish paper that use the current density between the membrane and catalyst or at the middle membrane. Which one should I use?
If possible for you, kindly share with me the files you mention. We can discuss it ...
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