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Transmission electron microscope (TEM) images of the supported catalyst: (a) 20 wt % Pt on as-grown single-walled carbon nanohorns (SWCNHs); (b) 20 wt % Pt on treated-SWCNHs; (c) 60 wt % Pt on as-grown SWCNHs; (d) 60 wt % Pt on treated SWCNHs. Reproduced with permission of [29]; American Chemical Society, 2009.
