Fig. 5. AMFC stability at high and low water conditions.

a Cell stability under relatively high anode/cathode dew points of 55/60 °C; (b) cell stability under optimized anode/cathode dew points of 53/55 °C. During the test, the cell voltage and ASR were recorded. The cells were constructed with a PtRu/C anode at 0.70 mg_PtRu cm⁻², a Pt/C cathode at 0.60 mg_Pt cm⁻², and a radiation-grafted ETFE-based AEI powder ionomer and HDPE-based AEM⁵. The cell temperature was maintained at 60 °C. H₂/air was kept at 1.0 L/min for anode/cathode, respectively. The cell current density was kept at 600 mA cm⁻². The data is presented without iR-correction.