Carbon Nanotubes Generated from Template Carbonization of Polyphenyl Acetylene as the Support for Electrooxidation of Methanol

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Abstract

The template carbonization of polyphenyl acetylene yielded well aligned, cylindrical, mono disperse carbon nanotubes (CNT), which are effectively utilized to load Pt, Pt−Ru, and Pt−WO3 nano particles. The nanoparticles are effectively dispersed inside the tube with the particle sizes of around 1.2, 1.6, and 10 nm for Pt, Pt−Ru, and Pt−WO3, respectively. The electrochemical surface area of the CNT-based electrode was higher compared to the Vulcun XC 72R carbon, graphite, and glassy carbon (GC) electrodes. The X-ray photoelectron spectroscopic measurements revealed that the Pt and Ru are in metallic state and W is in +VI oxidation state. The higher activity of GC/CNT−Pt−WO3−Nafion for methanol oxidation compared to GC/CNT/Pt−Ru−Nafion and GC/CNT/Pt−Nafion suggests the better utilization of the catalytic particles. The stability of the electrode for methanol oxidation polarized at +0.6 V follows the order of GC/CNT/Pt−Ru−Nafion > GC/CNT/Pt−WO3 > GC/CNT/Pt−Nafion, and for the electrodes polarized at +0.4 V, the order is GC/CNT/Pt−WO3−Nafion > GC/CNT/Pt−Ru−Nafion > GC/CNT/Pt−Nafion. The differences in the stability possibly suggest the better tolerance of the adsorbed species of methanol oxidation for the GC/CNT/Pt−WO3−Nafion electrode (when it is polarized at +0.4 V).

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