Fig. 3: PEMFC measurements.
a H2-air fuel cell polarization curves of Pt/C, Pt3Co/KB and Pt3Co/S-KB. Anode: 0.025 mgPt cm−2 of Pt/C; cathode:0.1 mgPt cm−2 of catalysts; temperature:94 °C; 100% relative humidity (RH); backpressure:150 kPaabs; Electrode active area: 25 cm2. b Comparison of the rated power density (@0.67 V) and Pt utilization (rated power of MEAs normalized by the total PGM loading) obtained in H2/air tests. DOE targets are indicated by the blue dashed and dotted lines. In order to verify the repeatability of the data, we conducted 3 tests and presented them in the form of averages ± standard deviation. c DRT plots of Pt/C, Pt3Co/KB and Pt3Co/S-KB at 1 A/cm2. d Total O2 mass transport resistance measured for Pt/C, Pt3Co/KB and Pt3Co/S-KB catalyst MEAs over the respective pressure in O2 concentration of 1%, whereas the regression line enables separation between \({R}_{o2}^{P,{ind}}\) and \({R}_{o2}^{P,{dep}}\). e Nyquist plots of EIS spectra under H2/N2. Lower right corner: The proton transfer impedance values of each sample obtained by fitting and calculating. f ECSA of the Pt/C, Pt3Co/KB, and Pt3Co/S-KB catalyst MEAs at 30% and 100% relative humidity (RH), and the difference between them. g–i Polarization curves of H2-air fuel cell with Pt/C, Pt3Co/KB, and Pt3Co/S-KB as the cathode at 30% and 100% relative humidity (RH). j voltage loss of different catalyst MEAs from 100 % RH to 30 % RH at 1 A cm−2.
