Abstract
Electrospun carbon nanofiber-supported bimetallic Pt x Au 100− x electrocatalysts (Pt x Au 100− x /CNF) were prepared by electrochemical codeposition method. The composition of PtAu bimetallic nanoparticles could be controlled by varying the ratio of H 2PtCl 6 and HAuCl 4. Scanning electron microscopy images showed that bimetallic nanoparticles had coarse surface morphology with high electrochemically active surface areas. X-ray diffraction analysis testified the formation of PtAu alloys. Pt x Au 100− x /CNF electrocatalysts exhibited improved electrocatalytic activities towards formic acid oxidation by providing the selectivity of the reaction via dehydrogenation pathway and suppressing the formation/adsorption of poisoning CO intermediate, indicating that Pt x Au 100− x /CNF is promising electrocatalyst in direct formic acid fuel cells.
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