Coulombic efficiency of electrodeposited microspheres of Pt and PtRu via in situ electrochemical quartz crystal microbalance

Trevor L. Knutson, William H Smyrl

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Abstract

The electrochemical quartz crystal microbalance technique has been used to obtain coulombic efficiencies for the electro reduction of pure Pt or PtRu self-assembled microspheres and the effect of precursor salt concentration and reduction potential. This technique has been demonstrated successfully to simultaneously obtain in situ data for mass change and current-voltage-charge phenomena. The coulombic efficiency for platinum reduction peaked near unity for a potential of -0.15 V vs calomel and tended to lower efficiency at more positive potentials. Similarly, a Pt precursor salt concentration of 4 mM showed a coulombic efficiency in excess of 90%, while the efficiency decreased as the concentration rose. PtRu mixed systems generally gave similar trends, while the efficiency was consistently lower than that of the pure Pt analogs.

Original languageEnglish (US)
JournalJournal of the Electrochemical Society
Volume154
Issue number11
DOIs
StatePublished - Oct 5 2007

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