Microwave-assisted synthesis of Pt/CNT nanocomposite electrocatalysts for PEM fuel cells
Microwave-assisted heating of functionalized, single-wall carbon nanotubes (FCNTs) inethylene glycol solution containing H2PtCl6, led to the reductive deposition of Pt nanoparticles(2.5–4 nm) over the FCNTs, yielding an active catalyst for proton-exchange membrane fuel cells(PEMFCs). In single-cell testing, the Pt/FCNT composites displayed a catalytic performance that was superior to Pt nanoparticles supported by raw (unfunctionalized) CNTs (RCNTs) or bycarbon black (C), prepared under identical conditions. The supporting single-wall carbon nanotubes (SWNTs), functionalized with carboxyl groups, were studied by thermogravimetric analysis (TGA), cyclic voltammetry (CV), and Raman spectroscopy. The loading level, morphology, and crystallinity of the Pt/SWNT catalysts were determined using TGA, SEM, andXRD. The electrochemically active catalytic surface area of the Pt/FCNT catalysts was 72.9 m2/g-Pt.