A Novel Approach for Controlled Synthesis of Single-Walled Carbon NanotubeSupported Pt Nanoparticle Catalysts and their Electrochemical Properties Lifeng Dong Department of Physics, Astronomy, and Materials Science, Missouri State University (a)
(b) Pt-SWCNT Pt-MWCNT
40 30 20 10
30
20 10 0
-10
-10
(c)
0
0.5
-0.5
1
1,400
1,400
Pt-SWCNT Pt-MWCNT
0.5
1
Pt-Ru-SWCNT Pt-Ru-MWCNT
1,200
1,000
0
Potential/V
(d)
Potential/V
1,200
Pt-Ru-SWCNT Pt-Ru-MWCNT
40
0
-0.5
1,000 -Z" /Ohm
-Z"/Ohm
50 Current Density (mA/cm 2)
Current Density (mA/cm 2)
50
800 600
800 600
400
400
200
200
0
0
0
1,000
2,000 Z'/Ohm
0
1,000
2,000 Z'/Ohm
Electrocatalytic activity of SWCNT and MWCNT supported Pt and Pt-Ru nanoparticles for methanol oxidation: cyclic voltammograms of (a) Pt nanoparticles and (b) Pt-Ru nanoparticles in 1 M CH3OH/ 0.5 M H2SO4 at 50 mV/s between -0.3 and +1.0 V vs. Ag/AgCl, and impedance plots of (c) Pt nanoparticles and (d) Pt-Ru nanoparticles at 0.3 V.
