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*

*この研究の対応する著者

研究成果: Article査読

30 被引用数 (Scopus)

抄録

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.

本文言語English
ページ(範囲)11296-11300
ページ数5
ジャーナルJournal of Physical Chemistry B
109
22
DOI
出版ステータスPublished - 2005 6月 9
外部発表はい

ASJC Scopus subject areas

  • 物理化学および理論化学
  • 表面、皮膜および薄膜
  • 材料化学

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