Journal of Combustion

Research Article

Multiphysical Models for Hydrogen Production Using NaOH and Stainless Steel Electrodes in Alkaline Electrolysis Cell

Parameters for the different electrolyte concentrations.


Parameters	Description	Value	Unit

V_rev	Reversible voltage	1.229	V
A	Area of electrode	0.00038	m²
,	Tafel’s coefficients for the cathode	0.195	V
,	Tafel’s coefficients for the anode	0.195	V
,	Effective current density of the cathode	1500	Am⁻²
,	Effective current density of the anode	1500	Am⁻²
,	Exchange current density of the cathode	17	Am⁻²
,	Exchange current density of the anode	17	Am⁻²
	Conductivity of 40 wt% NaOH at 80°C	90.83	S/m
	Conductivity of 30 wt% NaOH at 70°C	84.64	S/m
	Conductivity of 50 wt% NaOH at 80°C	83.86	S/m
	Conductivity of 60 wt% NaOH at 90°C	101.25	S/m
	Distance between the anode and the membrane	0.005	m
	Distance between the cathode and the membrane	0.005	m
	Void fraction of 40 wt% NaOH at 80°C	0.2	—
	Void fraction of 30 wt% NaOH at 70°C	0.24	—
	Void fraction of 50 wt% NaOH at 80°C	0.12	—
	Void fraction of 60 wt% NaOH at 90°C	0.1	—
C₁	Voltage drop for 40 wt% NaOH at 80°C	−1.7087	V
C₂	Voltage drop for 30 wt% NaOH at 70°C	−1.8303	V
C₃	Voltage drop for 50 wt% NaOH at 80°C	−1.3907	V
C₄	Voltage drop for 60 wt% NaOH at 90°C	−1.3202	V
k₁	Correction factor for 40 wt% NaOH at 80°C	0.034	—
k₂	Correction factor for 30 wt% NaOH at 70°C	0.034	—
k₃	Correction factor for 50 wt% NaOH at 80°C	0.03	—
k₄	Correction factor for 60 wt% NaOH at 90°C	0.03	—
,	Length of the cathode	0.1	m
,	Length of the anode	0.1	m
,	Resistivity of the cathode	6.9 × 10⁻⁷
,	Resistivity of the anode	6.9 × 10⁻⁷
R_mem	Resistance of the membrane	0.007 × 10⁻⁴

Parameters common to the various experiments: electrolyte concentration, interelectrode gap, and types of electrolyte.