Figure 3: Voltage losses obtained for the unmodified and for the N-doped Pt/C catalysts in GDE and in MEA characterization at low and high I/C ratio compared to an I/C ratio of 0.5. The data presented in A) was obtained by subtracting the polarization curve of the respective catalyst in the respective cell type shown in Figure 2B by the one shown in Figure 2A. The data presented in B) was obtained by subtracting the polarization curve of the respective catalyst in the respective cell type shown in Figure 2B by the one shown in Figure 2C.