nanoparticle: 4 nm PtO tetrahedron
surface: 50% epoxy oxidized graphite
film: Nafion (15-mer with EW=1144)
water content: λ = 15 H
2
O/HSO
3
separation distance: minimum
dark gray = C
white = H
red = O
light gray = Pt
yellow = S
pale pink = O in hydronium ion