Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10275910 | Journal of Electroanalytical Chemistry | 2005 | 10 Pages |
Abstract
The underpotential deposition (UPD) of silver and lead on Au(1Â 1Â 1) was performed sequentially to produce a thin composite layer. Ag was deposited underpotentially in 1Â mM Ag2SO4 and 0.1Â M H2SO4 at 0.400Â V and 0.010Â V vs. Ag wire. The results of cyclic voltammetry carried out on this Ag/Au(1Â 1Â 1) electrode in a Pb2+ electrolyte with 0.1Â M HClO4 indicated contributions from both Au and Ag substrates. In situ STM images showed that the UPD of Pb on Ag/Au(1Â 1Â 1) had an unusual multilayer morphology. Cyclic Voltammetry was also used to demonstrate the stability and presence of the Ag adlayer in the Pb2+ electrolyte. In the presence of sodium nitrate, this composite system exhibits a catalytic effect on nitrate reduction that is not observed for Au(1Â 1Â 1), Ag/Au(1Â 1Â 1), Pb/Au(1Â 1Â 1), Ag(1Â 1Â 1), or Pb/Ag(1Â 1Â 1). Our results demonstrate that the Ag-Pb/Au(1Â 1Â 1) composite system has an enhanced catalytic effect on nitrate reduction.
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Physical Sciences and Engineering
Chemical Engineering
Chemical Engineering (General)
Authors
Seongpil Hwang, Joohan Lee, Juhyoun Kwak,