Fig. 5: Hybrid fuel cells with improved durability against different operating conditions.
a Voltage profiles of a control cell and a hybrid cell operated under a constant current density of 0.2 A cm−2 in response to switching the H2 flow to N2 flow. b Current profiles of a control cell and a hybrid cell operated under a constant voltage of 0.8 V in response to air intrusion to the anodes. c Retention of the peak-power density of three control cells and a hybrid cell after three accelerated stress tests (see the polarization curves in Supplementary Fig. 12). The hybrid cell was used throughout all three tests (red line). For the control cell testing (black line), one cell was used for each test. All of the tests were conducted at 50 °C, and detailed testing conditions are provided in the Methods.
