Electrochemical nanogravimetric studies of sulfur/sulfide redox processes on gold surface

Elvira Bura-Nakic, András Róka, Irena Ciglenecki, G. Inzelt

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

Electrochemical quartz crystal microbalance, combined with cyclic voltammetric, chronoamperometric, and potentiostatic measurements, was used to study electrodeposition/dissolution phenomena at a gold electrode in solutions containing Na 2S. Spontaneous, open-circuit deposition processes as well as dissolution of the deposits in sulfide-free solutions have also been investigated. The potential range, scan rate, sulfide concentration, and pH have been varied. The results of the piezoelectric nanogravimetric studies are elucidated by a rather complex scheme involving underpotential deposition of sulfur at approximately -0.85 V vs. sodium calomel electrode, reductive dissolution of the deposited sulfur-containing layer at potentials more negative than approximately -0.9 V, and formation of a sulfur-containing multilayer at potentials more positive than -0.2 V. During the reduction of sulfur deposited on Au, a mass increase due to the formation of polysulfide species in the surface layer, accompanied by incorporation of Na + counterions, can be observed that starts at approximately -0.4 V. This is a reversible process, i.e., during the reoxidation, counterions leave the surface layers. Frequency excursions during the electroreduction and reoxidation processes reveal existence of several competitive dissolution-deposition steps. Spontaneous interaction between Au and HS - species results in a surface mass increase at the open-circuit potential, and it also manifests itself in the substantial decrease of the open-circuit potential after addition of Na 2S to the supporting electrolyte.

Original languageEnglish
Pages (from-to)1935-1944
Number of pages10
JournalJournal of Solid State Electrochemistry
Volume13
Issue number12
DOIs
Publication statusPublished - Dec 2009

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Sulfides
Sulfur
Gold
sulfides
Dissolution
sulfur
gold
dissolving
Networks (circuits)
surface layers
Polysulfides
Electrodes
Quartz crystal microbalances
polysulfides
Electrodeposition
electrodes
Electrolytes
Multilayers
quartz crystals
Deposits

ASJC Scopus subject areas

  • Electrochemistry
  • Electrical and Electronic Engineering
  • Condensed Matter Physics
  • Materials Science(all)

Cite this

Electrochemical nanogravimetric studies of sulfur/sulfide redox processes on gold surface. / Bura-Nakic, Elvira; Róka, András; Ciglenecki, Irena; Inzelt, G.

In: Journal of Solid State Electrochemistry, Vol. 13, No. 12, 12.2009, p. 1935-1944.

Research output: Contribution to journalArticle

Bura-Nakic, Elvira ; Róka, András ; Ciglenecki, Irena ; Inzelt, G. / Electrochemical nanogravimetric studies of sulfur/sulfide redox processes on gold surface. In: Journal of Solid State Electrochemistry. 2009 ; Vol. 13, No. 12. pp. 1935-1944.
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