PdCo@Pd/C Core-Shell Nanoparticles and Pt-Decorated PdCo@Pd/C for Oxygen Reduction

摘要

The high cost and scarcity of Pt pose serious problems for the widespread commercialization of fuel cell technologics. Recently, Pd-based cathode catalysts have attracted much attention because Pd possesses similar properties to Pt. The cost of Pd, however, is currently about one third that of Pt, and it is at least fifty times more abundant than Pt. Although Pd catalysts exhibit some catalytic activity towards the oxygen reduction reaction (ORR) especially with the incorporation of other metallic elements and even decorated with heteropolyacids, insufficient electrocatalytic activity and stability still remain as major obstacles for fuel cell application. While the bimetallic Pt–Pd system could act as an alternative means of improving the ORR activity of Pd catalysts, this kind of catalyst still requires a relatively high Pt loading.