Supporting Information
Metallizing Carbon Nanotubes with Pd-Pt Core-Shell Nanowires Enhances
Electrocatalytic Activity and Stability in the Oxygen Reduction Reaction
Kuanping Gong1,2, Jinseong Park2, Dong Su3, Radoslav R. Adzic1*
1
Chemistry Department, Brookhaven National Laboratory, Upton, NY 11973, USA
2 San
3
Jose Lab, Corporate Research Institute, Samsung Cheil Industries Inc., San Jose, California 95131.
Center for Functional Nanomaterials, Brookhaven National Laboratory, Upton, NY 11973, USA
Fig. S1 TEM and STEM images of PdNW/MWNTs.
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Fig. S2 Low- and high-magnification TEM images of PdNW/MWNTs.
Fig. S3 TEM images of surface-cleaned, free-standing Pd (left), and PdNW/MWNTs (right).
2
Scheme S1. Schematic illustration for the procedure of pre-treating MWNTs.
Figure S4. a) Schematic illustration of a single nanowire measuring h in length and 2r (r = 1
nm) nm in diameter, which can conceptually be converted to n NPs of 5 nm. b) Equivalent
number (n) of NPs of 5 nm as a function of the aspect ratio of a 2-nm-thick nanowire. c) Total
surface area of a nanowire and the equivalent NPs and their ration (d) as function of the aspect
ratio.
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Figure S5. TEM image of the PdNP/MWNT nanocomposite. The particle size of the Pd NPs is
evenly 2 nm.
Fig. S6 TEM image of PdNW/MWNTs after the 30,000-cycle stability test.
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