Retrieval of physical quantity Retrieval of physical quantity Retrieval of physical quantity Retrieval of physical quantity
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