nanoparticle = 4 nm PtO tetrahedron
surface = 25% epoxy oxidized graphite
film = 1 nm Nafion (15-mer with EW = 1144)
water content λ = 9 H
2
O/HSO
3
gray = C
white = H
red = O
light gray = Pt
yellow = S
pale pink = O in hydronium ion