Second harmonic generation study on electrochemical deposition of palladium on a polycrystalline gold electrode

Abstract

Electrochemical deposition (electrodeposition) and dissolution processes of Pd on a

Plasmonic Enhancement of Raman Scattering on Non-SERS-Active Platinum Substrates

“…1,2 After the discovery of the SERS effect [3][4][5] significant efforts have been made to increase the enhancement factor. As a result, the factor is now approaching the order of 10 14 , implying a possibility of single molecular detection. 6,7 However, the practical use of SERS is limited to roughened surfaces of coinage metals such as Ag, Au, and Cu, 8 and unfortunately, most of other metals, including catalytic metals such as Pt and Pd, are commonly considered to be non-SERS-active.…”

An SFG and DFG investigation of polycrystalline Au, Au–Cu and Au–Ag–Cu electrodes in contact with aqueous solutions containing KCN

“…A spectroelectrochemical approach has been recently taken: bulk field VIS-ERS, VIS-SHG and multiline SERS offer the possibility of significant breakthroughs in the study of electronic effects relevant to in situ Au-alloy work. In situ electrochemical SHG has been employed in the case of bimetallic interfaces, in the following UPD and electrodeposition studies: (i) polycrystalline Au electrodes and deposition of Ag [11], Pd [12] and Te [13]; (ii) Au(1 1 1) electrodes and deposition of Cu [14,15], Ag, Pb, Tl [15] and Te [16]; (iii) deposition of Cu on polycrystalline Ag [14]; (iv) deposition of Cd on polycrystalline Cu [17]; (v) polycrystalline Mo substrates and deposition of Cd [18] and In [19]. Regarding alloys, in situ SHG has been employed in the study of the corrosion of brass [20,21].…”

Construction of multilayers of bare and Pd modified gold nanoclusters and their electrocatalytic properties for oxygen reduction

“…Although Pd forms pseudomorphic layers on Au(111) for a few layers [17] and on Au(100) for over 20 layers [18], the unique electrochemical characteristics were observed only for the gold electrodes covered with a submonolayer of Pd. This observation suggests the importance of electronic effect that was further confirmed by SHG measurements [19]. Thus, the construction of an electrode of high surface area based on the concept of submonolayer modification by Pd is an interesting approach to develop a highly active electrocatalyst for the ORR.…”

“…Electrocatalytic activity for the ORR strongly depends on the Pd layer thickness, and higher reduction rates were observed for the electrodes with lower amounts of deposited Pd. To clarify the origin of the unique electrocatalytic properties of a thin Pd layer on a gold single crystal surface, the interfacial geometric and electronic structures of the Pd thin film/Au single crystal electrode were studied by surface x-ray scattering (SXS) [17,18] and second harmonic generation (SHG) spectroscopy [19], respectively. Although Pd forms pseudomorphic layers on Au(111) for a few layers [17] and on Au(100) for over 20 layers [18], the unique electrochemical characteristics were observed only for the gold electrodes covered with a submonolayer of Pd.…”