Physical
quantity
|
Physical meaning |
Units |
Value |
Cg0
|
Concentration of the gas phase |
g•cm-3
|
1.43×10-3
|
Cl0
|
Saturation concentration of the gas in solution |
g•cm-3
|
8.38×10-6
|
Dg
|
Diffusion coefficient in the gas phase |
cm2•s-1
|
0.100 |
Dl
|
Diffusion coefficient in solution |
cm2•s-1
|
2.41×10-5
|
\(D_{g\rightarrow l}\) |
Diffusion coefficient of a gas into a solution |
cm2•s-1
|
2.29×10-5
|
F |
Faraday’s constant |
C•mol-1
|
9.65×104
|
Test physical quantity |
Test physical quantity |
Test physical quantity |
Test physical quantity |
RGDL
|
Solid area specific resistance of the electrode |
Ω•cm2
|
5.26 |
S4
|
Electrochemical active surface area of GDE |
m2•g-1
|
1.41 |
\({\tilde{\rho}}_{S}\) |
Solid area specific resistance of GDE |
Ω•cm2
|
5.26 |
\({\tilde{\rho}}_{l}\) |
Liquid phase area specific resistance in
reaction layer |
Ω•cm2
|
71.7 |
Computational physical quantity |
Computational physical quantity |
Computational physical quantity |
Computational physical
quantity |
\({\tilde{D}}_{g}\) |
Effective diffusion coefficient of gas through GDE |
cm2•s-1
|
2.18×10-2
|
\({\tilde{D}}_{l}\) |
Effective diffusion coefficient of liquid
particles through GDE |
cm2•s-1
|
5.26×10-6
|
\({\tilde{D}}_{g\rightarrow l}\) |
Effective diffusion coefficient of
gas to solution |
cm2•s-1
|
5.00×10-6
|
\(L_{\text{Dg}}^{0}\) |
Characteristic reaction depth of gas phase
particle under ideal weak polarization |
μm |
1.44×105
|
\(L_{\text{Dl}}^{0}\) |
Characteristic reaction depth of liquid phase
particles under ideal weakly polarized condition |
μm |
237 |
\(L_{\Omega}^{0}\) |
Characteristic reaction depth of liquid phase
resistance in the reaction layer under ideal weak polarization |
μm |
2.70×103
|
S1
|
Total active surface area of catalyst per unit
volume of reaction layer |
cm2•cm-3
|
1.44×104
|
S2
|
Total active surface area of catalyst in wet area
per unit volume |
cm2•cm-3
|
7.22×103
|
ρ |
Density of GDE |
g•cm-3
|
1.03 |
φ |
Porosity of GDE |
—— |
0.676 |
Fitting physical quantities and other variables |
Fitting physical
quantities and other variables |
Fitting physical quantities and other
variables |
Fitting physical quantities and other
variables |
b |
Tafel slope |
V |
0.151 |
i0
|
Exchange current density |
A•cm-2
|
1.00×10-6
|
d |
Effective reaction depth of the electrode |
μm |
|
LDg
|
Characteristic reaction depth of gas phase
particles under large polarization |
μm |
|
LDl
|
Characteristic reaction depth of liquid particles
under large polarization |
μm |
|
LΩ
|
Characteristic reaction depth of liquid phase in
the reaction layer under large polarization |
μm |
|
RE
|
Volume specific resistance of bulk phase
electrolyte |
Ω•cm |
|
Δ |
Half of the thickness of the dry and wet zone in a thin plate model |
μm |
|
η0
|
Overpotential of the electrode surface |
V |
|
ηact
|
Voltage drop due to electrochemical polarization |
V |
|
ηohm,R
|
Voltage drop caused by ohmic polarization of
the liquid phase in the reaction layer |
V |
|
ηohm,E
|
Voltage drop caused by ohmic polarization of
electrolyte resistance |
V |
|