Spatially-resolved interfacial electrochemistry: Ohmic microscopy

Chen Youjiang, Alex Belianinov, Daniel Alberto Scherson

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

A method is herein described that allows spatially resolved capacitive currents at electrodelelectrolyte interfaces to be recorded in situ by monitoring the ohmic drop in the electrolyte, Δφsol, using two microreference electrodes. Measurements were performed in 0.1 M H 2SO4 aqueous solutions using Au and Pt either as single or dual working electrodes, that is, connected to one another, in an otherwise conventional three-electrode electrochemical cell. Plots of Δφ sol versus E, the potential of the dual AuIPt electrode with respect to the main reference electrode, recorded during voltammetric cycles, yielded curves bearing features characteristic of the Au|0.1 M H2SO 4 or Pt|0.1 M H2SO4 interface depending on whether the microreference electrodes were placed close to the Au or Pt electrode surface, respectively. Extensions of this methodology to measurements in the micrometer domain are discussed briefly.

Original languageEnglish
Pages (from-to)8754-8758
Number of pages5
JournalJournal of Physical Chemistry C
Volume112
Issue number24
DOIs
Publication statusPublished - 2008 Jun 19
Externally publishedYes

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Electrochemistry
electrochemistry
Microscopic examination
microscopy
Electrodes
electrodes
Polymethyl Methacrylate
Sols
Bearings (structural)
Electrochemical cells
electrochemical cells
Electrolytes
micrometers
plots
electrolytes
methodology
aqueous solutions
Monitoring
cycles
curves

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Electronic, Optical and Magnetic Materials
  • Surfaces, Coatings and Films
  • Energy(all)

Cite this

Spatially-resolved interfacial electrochemistry : Ohmic microscopy. / Youjiang, Chen; Belianinov, Alex; Scherson, Daniel Alberto.

In: Journal of Physical Chemistry C, Vol. 112, No. 24, 19.06.2008, p. 8754-8758.

Research output: Contribution to journalArticle

Youjiang, C, Belianinov, A & Scherson, DA 2008, 'Spatially-resolved interfacial electrochemistry: Ohmic microscopy', Journal of Physical Chemistry C, vol. 112, no. 24, pp. 8754-8758. https://doi.org/10.1021/jp8032726
Youjiang, Chen ; Belianinov, Alex ; Scherson, Daniel Alberto. / Spatially-resolved interfacial electrochemistry : Ohmic microscopy. In: Journal of Physical Chemistry C. 2008 ; Vol. 112, No. 24. pp. 8754-8758.
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