Table 3. Estimated Proton Conductivity of the PFSA Matrix and Thin Fiber Webs in the Composite Membrane (Thin Fiber Content of 15 wt %) from EIS Measurements Using Eq 5.

measurement condition	σmemb [mS/cm]	σmatrix [mS/cm]	σfiber [mS/cm]
single-cell FC, 80 °C, 100% RH@anode, 0.7 V	96	66	270
single-cell FC, 100 °C, 47% RH@anode, 0.7 V	33	25	79
single-cell FC, 120 °C, 24% RH@anode, 0.7 V	14	12	27
Pt|membrane|Pt cell, 80%, 95% RH	8.6	8.2	11