Fig. 5.Morphologies of the ionomers covered on the carbon-supported Pt catalysts (dashed line, carbon surface; dotted line, ionomer surface): (a) c-Pt/CB (low magnification), (b) c-Pt/CB (high magnification), (c) c-Pt/GCB (low magnification), (d) c-Pt/GCB (high magnification), (e) n-Pt/AB800 (low magnification), (f) n-Pt/AB800 (high magnification), (g) n-Pt/ AB250 (low magnification) and (h) n-Pt/AB250 (high magnification).