Research / 2020 / Article / Fig 4

Review Article

Advancement toward Polymer Electrolyte Membrane Fuel Cells at Elevated Temperatures

Figure 4

TEM images of (a) SnP2O7-H3PO4 and (b) pure SnP2O7. (c) Temperature dependence of proton conductivity for SnP2O7-H3PO4 and pure SnP2O7 in air. (d) Proton conductivity of SnP2O7-H3PO4 at 250°C in air as a function of time [87].