Quartz crystal microbalance study of palladium alloys. Part 1: Electrodeposition of Pt–Pd–Ru alloys

摘要

Electrodeposition of platinum alloys with palladium and ruthenium has been studied using electrochemical quartz crystal microbalance. Thin layers of Pt–Pd–Ru ternary alloys were obtained via potentiostatic deposition from galvanic baths of various H_2PtCl_6, RuCl_3 and PdCl_2 concentrations in HCl. The influence of electrolysis potential and the bath composition on Pt–Pd–Ru alloy bulk composition and efficiency of the process was reported. The highest electrodeposition efficiency (ca. 60%) in a wide potential range was obtained for the alloys prepared from baths of relatively high PdCl_2 concentration. The effect of electrodeposition efficiency enhancement after increasing of H_2PtCl_6 concentration was also observed at low electrodeposition potentials. Additional studies on the structure and morphology of the Pt–Pd–Ru alloys were performed using X-ray diffraction and SEM/EDX techniques.