Fig. 1.STEM images and Pt distributions at both interior and exterior surfaces of the carbon-supported Pt catalysts (SE mode, SEM image; TE mode, TEM image): (a) SE mode 0  of c- Pt/CB, (b) SE mode 180  of c-Pt/CB, (c) TE mode 0  of c-Pt/CB, (d) TE mode 180  of c-Pt/CB, (e) Pt distribution of c-Pt/CB, (f) SE mode 0  of c-Pt/GCB, (g) SE mode 180  of c-Pt/GCB, (h) TE mode 0  of c-Pt/GCB, (i) TE mode 180  of c-Pt/GCB, (j) Pt distribution of c-Pt/GCB, (k) SE mode 0  of n-Pt/AB800, (l) SE mode 180  of n-Pt/AB800, (m) TE mode 0  of n-Pt/AB800, (n) TE mode 180  of n-Pt/AB800, (o) Pt distribution of n-Pt/AB800, (p) SE mode 0  of n-Pt/AB250, (q) SE mode 180  of n-Pt/AB250, (r) TE mode 0  of n-Pt/AB250, (s) TE mode 180  of n-Pt/AB250 and (t) Pt distribution of n-Pt/AB250.