Fig. 4: Gas sorption analysis of catalysts with and without the ionomer.

N₂ sorption isotherms for Pt/HOMC (a), Pt/Ketjenblack (b) and Pt/Vulcan (c) before and after the introduction of Nafion ionomer. NLDFT pore size distribution for Pt/HOMC (d), Pt/Ketjenblack (e) and Pt/Vulcan (f) before and after the introduction of Nafion ionomer.