Electrochemical and Morphological Characterization of Pt–Cu Dealloying

The results of morphological and electrochemical characterizations of Cu 0.8 Pt 0.2 , Cu 0.75 Pt 0.25 , and Cu 0.71 Pt 0.29 dealloying in 1 M H 2 S O 4 are presented. The critical potential values for these systems were measured and compared to previously reported results for the Ag–Au system. The differences between the systems are discussed in terms of their relative surface diffusivity values. Based on potential hold data, the dealloying critical potentials for Cu 0.8 Pt 0.2 , Cu 0.75 Pt 0.25 , and Cu 0.71 Pt 0.29 are 0.565, 0.730, and 0.800 V , respectively, vs a normal hydrogen reference electrode. The critical overpotentials for dealloying in the Cu–Pt system were found to be approximately 100 mV greater than that for similar compositions in the Ag–Au system.