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Showing 1 to 13 of 13 for “"underpotential deposition"”.
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In Situ Structural Study of Underpotential Deposition and Electrocatalysis on Gold(111) Electrodes
… work has studied systems of Bi, Pb, Ag, and Hg underpotential deposition (UPD) on Au(111) electrodes. The application of the atomic force microscope (AFM), the scanning tunneling microscope (STM), and the surface x-ray scattering (SXS) to these UPD studies has provided in situ measurements from …
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Structure and Evolution of Intermetallic and Metallic Overlayers Onfcc(111) Metal Surfaces
Finally, the underpotential deposition (UPD) of cadmium onto Au(111) in aqueous solution was studied with STM and cyclic voltammetry. This system resulted in three linear overlayer structures which do not directly reflect the substrate symmetry. This result is in direct contrast to the majority of …
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Correlation of Structure and Electrochemical Reactivity at Underpotentially Deposited Modified Gold(111) Surfaces
… I-, on the peroxide reduction catalyzed by Pb underpotential deposition (upd) on Au(111) revealed that SCN- decreases the catalytic peroxide reduction activity. The decrease in reactivity due to SCN- exhibited Langmuir behavior. STM studies reveal that islands of two different heights emerge …
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Coadsorption of anions and ultra-thin metal films on single crystal electrodes
… Diffraction (LEED), the structures of anions/underpotential deposition (UPD) admetals were characterized in different electrodes and electrolytes. For the first time, it was shown that core-level electron energy loss spectra (CEELS) from adsorbed atomic and ionic adsorbates were electrode …
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Interfacial Study of Copper Electrodeposition with the Electrochemical Quartz Crystal Microbalance (EQCM)
… metal interconnects. Characterization of copper underpotential deposition (UPD) on ruthenium and RuO2 electrodes by means of electrochemical methods and other spectroscopic methods is presented. Copper electrodeposition in platinum and ruthenium substrates is investigated at pH values higher than …
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Study of Copper Electrodeposition on Ruthenium Oxide Surfaces and Bimetallic Corrosion of Copper/Ruthenium in Gallic Acid Solution
… we were focusing on the effect of copper electrodeposition on each type of oxides. From decreased charge of anodic stripping peaks and underpotential deposition (UPD) waves in cyclic voltammetry (CV), efficiency of Cu deposition dropped off indicating that interfacial binding strength between Cu …
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Integrated optical surface plasmon resonance for electrochemically addressed layers
… onto the gold surface of the device via the underpotential deposition process was monitored for the first time using the surface plasmon technique. Here the response and performance of the device was compared with other reported studies in the literature, which combined an optical and …
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Investigation of surface structures at catalytically important metals by UHV - electron spectroscopic and electrochemical methods
… a c(2 $\times$ 2) saturation coverage. Silver underpotential deposition onto this adlayer is distinct and qualitatively similar to the same behavior on iodine covered Rh(111). Chloride interference from reduced perchlorate was noticeable for both iodine and CO adlayers.
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Preparation and characterisation of Pt/C and Ni/C modified electrocatalysts for use towards the oxygen reduction reaction for proton exchange membrane fuel cells
… were characterised by TEM, CV and RDE. The deposition of the Pt precursor was shown to be incomplete; however, the catalysts still had a Pt content of ~ 4 wt%. Despite the low Pt content, the catalysts exhibited up to 8-fold increase in specific activity. The increase in activity was …
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Stability, structure, and barrier properties of self-assembled films on metal supports
… second part of this thesis discusses the use of underpotential deposition (upd) of silver and copper on gold to affect the structure and stability of an adsorbed n-alkanethiolate SAM. Thiols adsorb onto gold surfaces modified by submonolayer quantities of silver or copper and form SAMs with …
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Surface studies of Li-ion and Mg battery electrodes
… Mn2+ was also studied, as Cu is known to form an underpotential deposition (UPD) monolayer on Au electrodes. Following this, LMO particles were coated with a Au shell by a simple and scalable electroless deposition for use as Li-ion battery cathodes. The Au shell was intended to limit the capacity …
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A combined electrochemical and x-ray photoelectron spectroscopic approach to electrocatalysis
… bonds, the core-level binding energies of underpotentially-deposited copper and silver on a Rh(111) electrode surface were examined by X-ray photoelectron spectroscopy. Through XPS, the examined surfaces were found to contain carbon, oxygen, and sulfur or chlorine species, which confirmed …
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DNA as a functional molecule for control of nanomaterial morphology and for biosensing
… palladium nanoparticles via an early stage underpotential deposition of silver in the presence of a commonly used capping ligand CTAB is reported. Reports have shown that different DNA sequences can mediate the control of shapes and surface properties of nanoparticles. However, most studies …