Influence of the tip on electrode processes and on morphologies studied by in situ STM

Cu/Au

Jens E.T. Andersen, Per Møller

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

A smooth surface that may be amorphous was formed on a working electrode of polycrystalline gold by sweeping the potential. In an electrolyte of 0.01 M copper sulphate and 0.01 M sulphuric acid the morphology of the gold surface and of copper deposits were followed by in situ STM. Gold surfaces which had previously been subjected to many cycles of potentiostatic bulk copper electrodeposition exhibited a characteristic granular structure. On top of the granular structure the smooth gold surface was built up by surface diffusion, except underneath the tip, which shows that in situ STM only probes the surface locally. The action of the tip creates a cavity in the surface. From simultaneous recordings of current-voltage diagrams and of in situ STM images it is suggested that both surfaces' structural transformations and gas evolution contribute to the total charge passed. The potential of the electrode process depends linearly on the tip potential and it was found that the electrode process observed by in situ STM can be related to features of the current-voltage diagrams and of cyclic voltammograms only when the tip potential is zero.

Original languageEnglish
Pages (from-to)1-9
Number of pages9
JournalSurface and Coatings Technology
Volume89
Issue number1-2
DOIs
Publication statusPublished - Feb 15 1997

Fingerprint

Electrodes
electrodes
Gold
gold
copper
diagrams
Copper deposits
Copper Sulfate
gas evolution
Copper
Surface diffusion
Electric potential
electric potential
surface diffusion
Electrodeposition
electrodeposition
Electrolytes
sulfates
Gases
recording

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Materials Chemistry

Cite this

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abstract = "A smooth surface that may be amorphous was formed on a working electrode of polycrystalline gold by sweeping the potential. In an electrolyte of 0.01 M copper sulphate and 0.01 M sulphuric acid the morphology of the gold surface and of copper deposits were followed by in situ STM. Gold surfaces which had previously been subjected to many cycles of potentiostatic bulk copper electrodeposition exhibited a characteristic granular structure. On top of the granular structure the smooth gold surface was built up by surface diffusion, except underneath the tip, which shows that in situ STM only probes the surface locally. The action of the tip creates a cavity in the surface. From simultaneous recordings of current-voltage diagrams and of in situ STM images it is suggested that both surfaces' structural transformations and gas evolution contribute to the total charge passed. The potential of the electrode process depends linearly on the tip potential and it was found that the electrode process observed by in situ STM can be related to features of the current-voltage diagrams and of cyclic voltammograms only when the tip potential is zero.",
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Influence of the tip on electrode processes and on morphologies studied by in situ STM : Cu/Au. / Andersen, Jens E.T.; Møller, Per.

In: Surface and Coatings Technology, Vol. 89, No. 1-2, 15.02.1997, p. 1-9.

Research output: Contribution to journalArticle

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AB - A smooth surface that may be amorphous was formed on a working electrode of polycrystalline gold by sweeping the potential. In an electrolyte of 0.01 M copper sulphate and 0.01 M sulphuric acid the morphology of the gold surface and of copper deposits were followed by in situ STM. Gold surfaces which had previously been subjected to many cycles of potentiostatic bulk copper electrodeposition exhibited a characteristic granular structure. On top of the granular structure the smooth gold surface was built up by surface diffusion, except underneath the tip, which shows that in situ STM only probes the surface locally. The action of the tip creates a cavity in the surface. From simultaneous recordings of current-voltage diagrams and of in situ STM images it is suggested that both surfaces' structural transformations and gas evolution contribute to the total charge passed. The potential of the electrode process depends linearly on the tip potential and it was found that the electrode process observed by in situ STM can be related to features of the current-voltage diagrams and of cyclic voltammograms only when the tip potential is zero.

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