Underpotential Deposition at Single Crystal Surfaces of Au, Pt, Ag and Other Materials

Abstract

Enrique Herrero was born in Salamanca, Spain, in 1967. He received his B.S. in Chemistry from the University of Alicante (Spain) in 1990. His graduate thesis dealt with the oxidation of methanol, formic acid, and CO on platinum single crystals and was completed in 1995 at the University of Alicante under the direction of Prof. Juan M. Feliu. During this time he spent one year working with Prof. Andrzej Wieckowski at the University of Illinois at Urbana-Champaign. In 1996 he went on to a postdoctoral appointment in the group of Prof. He ´ctor D. Abrun ˜a in the Chemistry Department at Cornell University, where he worked on metal deposition on single crystals. He is currently an assistant professor at the University of Alicante. Lisa Buller received a B.S. in Chemistry from the University of WisconsinsMadison in 1992. She obtained a Ph.D. in Chemistry from Cornell University in 1997 under the direction of Prof. H. D. Abrun ˜a. Her thesis work dealt with electrochemical and X-ray studies of metal deposition onto single crystals. She is currently an assistant professor at the University of WisconsinsPlatteville.

Inhibition effect of underpotential deposition of metallic cations on aqueous corrosion of metals

“…The results have shown that Pb 2+ inhibits the active dissolution of Ni in 0.1 m perchloric acid, which was ascribed to Pb-UPD on Ni. This is the first report that suggests the participation of Pb-UPD in corrosion of Ni although there are many reports of Pb-UPD on noble metals (Herrero et al, 2001). The corrosion potential of Ni in 0.1 m perchloric acid containing 5 × 10 −3 m Pb 2+ is about −0.09 V, which is located in the potential region of Pb-UPD between −0.205 V and 0.245 V on Ni since the potential window of Pb-UPD on Ni estimated from Eq.…”

“…The term UPD is applied to the reaction of adsorption of metallic cations (M z+ ) in solution being electro-deposited up to the monolayer level on a foreign metal substrate (M′) at potentials more positive than the equilibrium potential of the M z+ /M electrode (Kolb et al, 1974;Kolb, 1978). As reviewed by Herrero et al (2001), there have been many studies of UPD on welldefined single-crystal noble metal substrates such as Ag, Au and Pt in relation to the enhancement of electro-catalytic activity due to UPD.…”

Materials Design and System Construction for Conventional and New‐Concept Supercapacitors

“…Au, Pt, Rh, and Ru) to form an adsorbed monolayer above their redox potential, thus UPD is also called two‐dimensional adsorption pseudocapacitance 47, 48…”

Engineering the architectural diversity of heterogeneous metallic nanocrystals

“…In this approach, UPD is used to reverse the order of the reduction potentials of the two metal precursors (Ag and Pd precursors). The precursor of the more reactive metal (Ag in this case) is quickly reduced to form a Ag UPD layer on the central NC [18][19][20][21][22][23] , which would otherwise be the less favourable metal for reduction without UPD ( Fig. 2i-ii).…”