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Modules
Posted 08.03.2017, 04:05 GMT-5 Battery Design, Modeling Tools & Definitions, Parameters, Variables, & Functions, Studies & Solvers Version 5.2a 3 Replies
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Hi,
New to using COMSOL, basically I want to develop a PEMFC but do not have the batteries and fuel cell module.
Is there anyway the user can manually put in equations etc?
Also for analysis I want to be able perform cyclic voltammetry, again I see this comes standard with the batteries and fuel cell module but is there anyway around not buying the module?
Cheers,
Matthew
New to using COMSOL, basically I want to develop a PEMFC but do not have the batteries and fuel cell module.
Is there anyway the user can manually put in equations etc?
Also for analysis I want to be able perform cyclic voltammetry, again I see this comes standard with the batteries and fuel cell module but is there anyway around not buying the module?
Cheers,
Matthew
3 Replies Last Post 08.03.2017, 10:21 GMT-5
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Posted:
8 years ago
Hi
I reply only to the cyclic voltammetry question:
Yes, you can do it with the Transport of Diluted Species module. Put the electrochemical reaction, R, as the flux boundary condition. Potential can be defined either as a piecewise function, but I prefer the Heaviside function in the definition of the variable E:
E = Ei + si*(v*t - 2*v*(t - ts)*flc2hs((t - ts)[1/s],0.001))
TH = exp[nF/(RT)*E]
R = n*F*k0*(CR*TH^a - CO*TH^(a-1))
where Ei is the initial potential and ts is the time of switching the direction of scan and v the scan rate; "si" is ±1, i.e. the direction of the scan; a is the charge transfer coefficient; CR and CO are the concentrations of the two species participating in the reaction and k0 the standard rate constant.
Setting up the entire battery should be possible, it just requires more work; I have not done that.
BR
Lasse
I reply only to the cyclic voltammetry question:
Yes, you can do it with the Transport of Diluted Species module. Put the electrochemical reaction, R, as the flux boundary condition. Potential can be defined either as a piecewise function, but I prefer the Heaviside function in the definition of the variable E:
E = Ei + si*(v*t - 2*v*(t - ts)*flc2hs((t - ts)[1/s],0.001))
TH = exp[nF/(RT)*E]
R = n*F*k0*(CR*TH^a - CO*TH^(a-1))
where Ei is the initial potential and ts is the time of switching the direction of scan and v the scan rate; "si" is ±1, i.e. the direction of the scan; a is the charge transfer coefficient; CR and CO are the concentrations of the two species participating in the reaction and k0 the standard rate constant.
Setting up the entire battery should be possible, it just requires more work; I have not done that.
BR
Lasse
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Posted:
8 years ago
Aargh!
In the definition of R, no F, in order to have it in the dimension mol/(cm²s).
L
In the definition of R, no F, in order to have it in the dimension mol/(cm²s).
L
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Posted:
8 years ago
Thanks Lasse.