Fig. 1. Schematic of the SPE single-cell.
Fig. 2. XRD patterns of Ir black and IrO2 powder.
Fig. 3. SEM image of Ir black, IrO2 and Pt/C (40 wt%) powder.
Fig. 4. SEM image showing the cross-section (a) of a fresh MEA with anode (IrO2) (b), and cathode (Pt/C (Pt 40 wt%)) (c), respectively.
Fig. 5. SEM image showing the surface of IrO2 (a), Ir black (b) of anode, and Pt/C (Pt 40 wt%) (c) of cathode.
Fig. 6. Impedance curves of MEA cells with various catalyst at 80°C and 10 mV (a), Nyquist plot feature (IrO2-3 as example) and the equivalent circuit for SPE water electrolysis (b).
Fig. 7. Polarization curves (a), and over-potential (b) of the SPE water electrolysis cell with the MEAs prepared with iridium oxide catalyst and iridium black electrode at atmospheric pressure and 80°C.
Fig. 8. Evaluation of stability of SPE cells with the indicated MEAs at 80°C and 1 A cm-2.
Table 1. Electrode design of single cells with various loading level.