| 초록 |
It is mightily important to design and fabricate highly active and durable oxygen reduction reaction (ORR) catalysts for the application of proton exchange membrane fuel cells. The use of Pt catalysts is severely limited because of high cost and limited resources. Accordingly, the design of novel catalysts requires not only reducing the amount of Pt used but also enhancing catalytic activity, and stability for the application in fuel cells is critical. Composites consisting of conducting polymers and metal nanoparticles are of great interest due to their combined properties of organic conductors and high surface area materials. Among conducting polymers, polyaniline (PANI) has been widely studied due to its unique thermal stability, high conductivity, environmental stability and reversible electrochemical and physical properties controlled by its oxidation and protonation. We developed a unique strategy to generate core@shell nanoparticles based on AuNPs decorated with PANI shell. Concretely, AuNPs having PANI on the surface were first fabricated. Then, they were mixed with selected transition metal precursors and platinum precursor solutions followed by reduction using reducing agent. The alloy metal NPs thus incorporated were distributed uniformly in the PANI shells. We systematically investigate the structural alteration during the sequential synthetic process and compared the performance with respect to Pt-decorated AuNP@PANI structures. The AuNP@PANI@Pt-transiton metal core-shell nanostructures showed a viable and efficient electrocatalytic activity for oxygen reduction reaction. |
