Changes of particle diameter ϕ, particle number concentration n, and surface Ni percentage θ with increasing N are presented in Fig. 3. Measurements of ϕ made under TEM show that ϕ is normally distributed ( Fig. 2). The mean value of ϕ increases linearly from 2.8 to ca. 4 nm as N increases from 1 to 4 and then plateaus as Pt2+ is depleted (Fig. 3a). n is computed from the initial molar concentrations of Pt2+ and Ni2+ (CPt = CNi = 0.19 M), their yields (ηPt and ηNi), and the atomic volumes of Pt and Ni atoms in crystals (υPt = 0.0151 nm3 and υNi = 0.0109 nm3, which are calculated with their lattice parameters [39]):
equation(1)
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