Specific features of the formation, catalytic activity, and corrosion stability of PdCu electrolytic co-deposit

A mixed electrolytic deposit (ED) of PdCu (similar to 20 at.% Cu) is synthesized from a solution of 1 m\M PdSO4 + 5 m\M CuSO4 + 0.5 M H2SO4 in the region of copper underpotential deposition (+400 mV vs. RHE). The incorporation of copper into the Pd deposit increases its true surface area (S-true) by a factor of similar to 20 and changes its hydrogen sorption characteristics. The ED PdCu demonstrates higher specific activity in FAOR as compared with individual Pd deposit (E-dep = 0.4 V). The specific solubility of Pd from ED PdCu is shown to be 2-3 times lower than the solubility of ED Pd; however, its total solubility from PdCu increases due to the strong increase in S-true.