Page 252 - High Temperature Solid Oxide Fuel Cells Fundamentals, Design and Applications

Chapter 9

Electrode Polarisations

Ellen Ivers-Tiffee and Ani1 V. Virkar

Free energy change
Partial pressure of species i
Faraday constant
Electrostatic potential
Avogadro's number
Flux of species i
Nernst potential
Overpotential
Ideal gas constant
Charge transfer resistance
Polarisation resistance
Resistivity of the material for the transport of species i
Binary diffusivity of i - j
Effective cathode gas diffusivity
Effective anode gas diffusivity
Volume fraction porosity
Surface exchange coefficient
Impedance at angular frequency w
Imaginary part of admittance
Real part of admittance
Anode thickness
Cathode thickness
Electrolyte thickness
Exchange current density
Anode limiting current density
Cathode limiting current density
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l ~ or p ~ Three phase boundary length
B Transfer coefficient of symmetry factor