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(a) Normalized ECSA until 30,000 cycles of the AST durability test in N2-saturated 0.1 M HClO4 of Pt/C-S, Pt/C, and C-Pt/C. ORR polarization curve before and after 30,000 cycles of AST of (b) Pt/C-S, (c) Pt/C, and (d) C-Pt/C. Numbers in (b–d) indicate the initial and final cycle of the AST durability test. Reproduced with permission from Elsevier (reference [235]).
