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Electrochemistry at Non-ideal and Nanostructured Electrodes

English title Electrochemistry at Non-ideal and Nanostructured Electrodes
Applicant Siegenthaler Hans F.
Number 103841
Funding scheme Project funding (Div. I-III)
Research institution Departement für Chemie und Biochemie Universität Bern
Institution of higher education University of Berne - BE
Main discipline Physical Chemistry
Start/End 01.04.2004 - 31.03.2006
Approved amount 118'980.00
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Keywords (7)

single-drystal electrodes; electrochemical reactivity; local probing; heterostructures; underpotential deposition; adsorption;

Lay Summary (English)

Lead
Lay summary
In the submitted follow-up project, the elucidation of electrochemicalreactivity at 'non-ideal' electrodes with structural, morphological andchemical heterogeneities will be continued and extended in two topics:(a) The investigation of conducting polymer/metal composite films will becontinued for electropolymerised polyaniline films with inserted Pdnanoparticles, using in-situ and ex-situ STM and phase-mode AFM methods,voltammetric techniques and XPS analysis. The main emphasis will befocussed on elucidating the spatial distribution of the inserted Pdparticles. In addition, the redox behaviour and electrocatalytic activityof the composite films will be investigated by voltammetric techniquesusing model reactions.(b) Following previous in-situ STM studies of metal underpotentialdeposition at stepped single-crystal electrodes in absence of additionalspecifically adsorbed species, or in presence of relatively weaklyadsorbed anionic species such as Cl-, combined electrochemical/STMinvestigations will be extended to single-crystal that are additionallyelectrochemically modified with ordered monoatomic or oligoatomic adlayersof strongly adsorbed (metallic and nonmetallic) species, including stablesurface alloys, whose structure can be varied by the electrochemicalformation conditions and is also sufficiently stable to undergo only minoror no changes upon emersion of the substrate/adsorbate system fromelectrolytic environment to UHV. The local formation mechanisms andstructural properties of such adlayers at stepped single-crystalelectrodes. These adlayer-modified electrodes will be further studied withregard to their electrochemical reactivity towards deposition of a second(metallic) species, and the results will be compared with metaldeposition at non-modified single-crystal electrodes. The structuralproperties of the resulting binary heterostructures in electrolyticenvironment, and their stability upon emersion to UHV, will be examined byelectrolytic and by UHV STM, respectively. In addition, the single-crystalmetal substrates modified with the stable adlayer or heterostructure willbe used as templates with variable structure for the adsorption ofassemblies of selected organic molecules. The structural and electronicproperties of these assemblies will be studied in the group of thecoapplicant (Dr. P. Gröning, EMPA Thun) in view of their possiblepotential as molecular electronic devices
Direct link to Lay Summary Last update: 21.02.2013

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Associated projects

Number Title Start Funding scheme
63747 Electrochemistry at Non-ideal and Nanostructured Electrodes 01.04.2001 Project funding (Div. I-III)

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