Electrochemistry in ultrahigh vacuum

Underpotential deposition of Al on polycrystalline W and Au from room temperature AlCl 3/1-Ethyl-3- methylimidazolium chloride melts

Matthew Johnston, Jae Joon Lee, Gary S. Chottiner, Barry Miller, Tetsuya Tsuda, Charles L. Hussey, Daniel Alberto Scherson

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

The voltammetric characteristics of polycrystalline Au and W electrodes cleaned (thermal annealing at 1100 K) and characterized (Auger electron spectroscopy) in ultrahigh vacuum (UHV) have been examined in ultrapure AlCl 3/1-ethyl-3-methylimidazolium chloride (EtMeImCl) melts in UHV. These experiments were performed using a custom-designed transfer system that allows for the all-Al electrochemical cell to be filled with EtMeImCl in an auxiliary UHV chamber and later transferred under UHV to the main UHV chamber that houses the Auger electron spectrometer. The results obtained for the underpotential (UPD) and bulk deposition of Al on Au were found to be very similar to those reported in the literature for measurements carried out under 1 atm of an inert gas in a glovebox. For the far more reactive W surfaces, voltammetric features ascribed to the stripping of underpotential-deposited Al could be observed following a single scan from 1.0 V vs Al 3+/Al to a potential negative enough for bulk deposition of Al to ensue. This behavior is unlike that reported in the literature for experiments performed in a glovebox, which required either extensive potential cycling in the Al bulk deposition and stripping region or excursions to potentials positive enough for chlorine evolution to ensue for Al UPD features to be clearly discerned. These observations open new prospects for fundamental electrochemical studies of well-characterized, highly reactive metals, including single crystals, in a variety of low vapor pressure ionic liquids.

Original languageEnglish
Pages (from-to)11296-11300
Number of pages5
JournalJournal of Physical Chemistry B
Volume109
Issue number22
DOIs
Publication statusPublished - 2005 Jun 9
Externally publishedYes

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Electrochemistry
Vacuum deposition
vacuum deposition
Ultrahigh vacuum
electrochemistry
Vacuum
ultrahigh vacuum
Chlorides
chlorides
gloveboxes
Temperature
room temperature
vacuum chambers
stripping
Electrons
metal crystals
Vapor Pressure
Noble Gases
Ionic Liquids
Electrochemical cells

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films
  • Materials Chemistry

Cite this

Electrochemistry in ultrahigh vacuum : Underpotential deposition of Al on polycrystalline W and Au from room temperature AlCl 3/1-Ethyl-3- methylimidazolium chloride melts. / Johnston, Matthew; Lee, Jae Joon; Chottiner, Gary S.; Miller, Barry; Tsuda, Tetsuya; Hussey, Charles L.; Scherson, Daniel Alberto.

In: Journal of Physical Chemistry B, Vol. 109, No. 22, 09.06.2005, p. 11296-11300.

Research output: Contribution to journalArticle

Johnston, Matthew ; Lee, Jae Joon ; Chottiner, Gary S. ; Miller, Barry ; Tsuda, Tetsuya ; Hussey, Charles L. ; Scherson, Daniel Alberto. / Electrochemistry in ultrahigh vacuum : Underpotential deposition of Al on polycrystalline W and Au from room temperature AlCl 3/1-Ethyl-3- methylimidazolium chloride melts. In: Journal of Physical Chemistry B. 2005 ; Vol. 109, No. 22. pp. 11296-11300.
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abstract = "The voltammetric characteristics of polycrystalline Au and W electrodes cleaned (thermal annealing at 1100 K) and characterized (Auger electron spectroscopy) in ultrahigh vacuum (UHV) have been examined in ultrapure AlCl 3/1-ethyl-3-methylimidazolium chloride (EtMeImCl) melts in UHV. These experiments were performed using a custom-designed transfer system that allows for the all-Al electrochemical cell to be filled with EtMeImCl in an auxiliary UHV chamber and later transferred under UHV to the main UHV chamber that houses the Auger electron spectrometer. The results obtained for the underpotential (UPD) and bulk deposition of Al on Au were found to be very similar to those reported in the literature for measurements carried out under 1 atm of an inert gas in a glovebox. For the far more reactive W surfaces, voltammetric features ascribed to the stripping of underpotential-deposited Al could be observed following a single scan from 1.0 V vs Al 3+/Al to a potential negative enough for bulk deposition of Al to ensue. This behavior is unlike that reported in the literature for experiments performed in a glovebox, which required either extensive potential cycling in the Al bulk deposition and stripping region or excursions to potentials positive enough for chlorine evolution to ensue for Al UPD features to be clearly discerned. These observations open new prospects for fundamental electrochemical studies of well-characterized, highly reactive metals, including single crystals, in a variety of low vapor pressure ionic liquids.",
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