Abstract
Carbon supported Au core was synthesized with two-phase protocol using dodecanethiol as a stabilizer and Pt shell was formed on the core surface by immersing the core into K_2PtCl_4 aq. at 303 K. Durability of the Au core/Pt shell structured catalyst was evaluated with rectangular potential cycling in 0.1 M HClO_4 aq. at 333 K. In the early stage of the durability test, electrochemical surface area of the catalyst decreased by 40 % of the initial surface area, which was mainly due to solid solution formation of the Pt shell with the Au core. As-synthesized core/shell catalyst was annealed in air to form the solid solution in advance. The decrease of the electrochemical surface area of the annealed core/shell catalyst was suppressed in the early stage of the durability test.
