Paper
Electrodeposition of Palladium–Tin Alloys from 1-Ethyl-3-methylimidazolium Chloride–Tetrafluoroborate Ionic Liquid for Ethanol Electro-Oxidation
Published Aug 1, 2010 · Liangder Jou, Jeng‐Kuei Chang, T. Whang
Journal of The Electrochemical Society
26
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Abstract
Electrodeposition of palladium-tin alloys from 1-ethyl-3-ethylimidazolium chloride―tetrafluoroborate ionic liquid was studied at 120°C. Sn(II) chloride reacts spontaneously with Pd(II) chloride, producing Sn(IV) and Pd nanoparticles. Solutions containing Sn(IV) and Pd(II) were used for potentiostatic electrodeposition of Pd-Sn. The composition of the Pd-Sn electrodeposits varied with the solution composition and deposition potential. Different alloy phases were observed with X-ray diffraction measurements. Whereas the Pd-rich Pd-Sn solid solution deposits are composed of compact nodules, the Sn-rich intermetallic Pd―Sn deposits are composed of polyhedral crystals of various phases. Compared to Pd-coated electrodes, Pd-Sn solid-solution-coated electrodes show enhanced ethanol electro-oxidation efficiency and stability in alkaline aqueous solutions. As Sn content increased, new Pd/Sn intermetallic phases formed, resulting in reduced catalytic efficiency for ethanol oxidation.
Electrodeposition of palladium-tin alloys from 1-ethyl-3-methylimidazolium chloride-tetrafluoroborate ionic liquid at 120°C enhances ethanol electro-oxidation efficiency and stability in alkaline aqueous solutions.
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