Abstract
Core–shell structured SiC@C with a nanoscale SiC core covered by a graphitic carbon shell was used as a novel support for Pt electrocatalyst in direct methanol fuel cells (DMFCs) to achieve high durability and catalytic performance. The SiC@C was prepared by graphitization of nano-SiC under a vacuum of 10−3Pa at 1500°C. The epitaxial growth carbon layer had a high conductivity and an affinity for Pt catalyst metal, while SiC core retained its high stability. Pt electrocatalysts supported on SiC@C (Pt/SiC@C) were prepared using a microwave heating method. The electrochemical results showed that the Pt/SiC@C electrocatalyst had much higher catalytic activities for methanol electro-oxidation and oxygen reduction reactions than the Pt/SiC. More significantly, the Pt/SiC@C electrocatalyst showed a greater stability in comparison to the traditional Pt/C. The superior electrocatalytic performances of Pt/SiC@C were ascribed to a high dispersion of Pt nanoparticles on the SiC@C support and a high stability of the SiC@C support in acid solution.
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