Limiting current % reductions 1 Catalyst utilization 1 Electrochemical electrodes 1 Electrochemical limiting current 1 Electrochemical mass transfer 1 Electrochemicals 1 Electrode material 1 Electrolytic reduction 1 Limiting diffusion current 1 Mass transfer 1 Nickel alloys 1 O2 transport 1 PEMFC 1 Reduction of ferricyanide 1 Rotating disk electrodes 1 Rotating disc electrode 1 Two-phase model 1