Hydrogen oxidation reaction on thin platinum electrodes in the polymer electrolyte fuel cell
Journal article, 2010
A method for measuring the kinetics of the hydrogen oxidation reaction (HOR) in a fuel cell under enhanced mass transport conditions is presented. The measured limiting current density was roughly 1600 mA cm(Pt)(-2), corresponding to a rate constant of the forward reaction in the Tafel step of 0.14 mol m(-2) s(-1) at 80 degrees C and 90% RH. The exchange current density for the HOR was determined using the slope at low overvoltages and was found to be 770 mA cmp(Pt)(-2). The high values for the limiting and exchange current densities suggest that the Pt loading in the anode catalyst can be reduced further without imposing measurable voltage loss.
Exchange current density
Hydrogen oxidation reaction
Limiting current density