In Situ Synthesis and Characterization of Polyethyleneimine-Modified Carbon Nanotubes Supported PtRu Electrocatalyst for Methanol Oxidation

Figure 4

TEM images and the corresponding PtRu particle size distribution histograms of 30 wt% PtRu/O-MWCNTs ((a), (b)); 10 wt% PtRu/PEI-MWCNTs ((c), (d)); 30 wt% PtRu/PEI-MWCNTs ((e), (f)); and 50 wt% PtRu/PEI-MWCNTs ((g), (h)).

(a)

(b)

(c)

(d)

(e)

(f)

(g)

(h)