Abstract
The electrochemical reduction of palladium halide complexes such as PdBr 4 2− and PdCl 4 2− was investigated in a hydrophobic room-temperature ionic liquid (RTIL), 1- n-butyl-1-methylpyrrolidinium bis(trifluoromethylsulfonyl)imide (BMPTFSI). The irreversible electrode reaction between Pd(II) and Pd(0) was observed in BMPTFSI containing PdBr 4 2− or PdCl 4 2− by cyclic voltammetry. The diffusion coefficient of PdBr 4 2− was estimated to be (1–2) × 10 −7 cm 2 s −1 by choronopotentiometry and chronoamperometry. The deposition of crystalline Pd metal was confirmed by X-ray diffraction and X-ray photoelectron spectroscopy. It was suggested by the chronoamperometric measurements on PdBr 4 2− in BMPTFSI that the initial stage of the electrodeposition of Pd on the polycrystalline Pt electrode surface involves three-dimensional progressive nucleation under diffusion control. The reduction potential of PdCl 4 2− was more negative than that of PdBr 4 2−, reflecting the difference in the donor property between chloride and bromide.
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