Structure and Stability of Core–Shell Cu–Pt Nanoparticles for Catalytic Applications

We have successfully synthesized monodisperse core–shell Cu–Pt particles through a solvothermal method that enables control of the shell thickness to enhance the exposed Pt surface area and maintain a narrow size distribution. The core–shell Cu–Pt particles were tested as catalysts for the oxygen reduction reaction and showed promising catalytic properties. Postcatalysis analysis showed that most particles remain stable after catalysis. In situ electron microscopy demonstrates the remarkable stability of the sample in an oxidizing environment. It also visualizes the degradation mechanisms in oxidative conditions as being segregation of Pt and Cu oxide and the loss of the core–shell configuration. These core–shell Cu–Pt particles have the potential to improve the effectiveness of costly metals used in surface reactions for heterogeneous catalysis.