Figure 2: TEM images and size histograms.

(a–c) HRTEM images of the Pt_ngDNA–GO composite, Pt nanoparticles/GO and Pt/C catalyst. Scale bars, 2 nm. (d) Histograms of Pt cluster sizes in the Pt_n/gDNA–GO composite, (e) Pt particle sizes in the Pt nanoparticles/GO catalyst and (f) Pt particle sizes in the Pt/C catalyst.