Electrochemical QCM Studies of Aluminum Deposition and Alloy Formation on Au(111) in Ambient Temperature Molten Salts/Benzene Mixtures

Jae Joon Lee, Yibo Mo, Daniel Alberto Scherson, Barry Miller, Kraig A. Wheeler

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

Certain aspects of the electrochemical deposition of Al on Au electrodes from ambient-temperature acidic AlCl3/l-elhyl-3-meihyl imidazolium chloride (EMIC) melts have been examined in situ using a quartz, crystal microbalance (QCM), These experiments were performed using benzene as a cosolvent to decrease the very high viscosity of the neat molten salt. A linear correlation was found between the change in the frequency of the QCM and the amount of electrodeposited Al for amounts of Al ranging from 0.05 to 0.27 μg/cm2. This observation suggests that within this mass range the flims are relatively smooth and rigidly bound to the underlying substrate. For lower masses, the plot was also linear, except that the slope was significantly smaller than that expected based on the weight of Al. a phenomenon attributed to mass compensation. Large deviations from linearity were observed when the amount of deposited Al increased beyond 0.27 μg/cm2. This behavior is consistent with the growth of discrete Al clusters leading to increased surface roughness and to liquid entrapment within the cluster array, which contributes to the frequency changes measured by the QCM. Long times were required for the mass of the Au electrode to return to its original value following deposition and stripping, which is consistent with the formation of bulk Al/Au alloys as has been earlier proposed.

Original languageEnglish
JournalJournal of the Electrochemical Society
Volume148
Issue number12
DOIs
Publication statusPublished - 2001 Dec 1
Externally publishedYes

Fingerprint

Quartz crystal microbalances
Benzene
Aluminum
Molten materials
Salts
Electrodes
Temperature
Surface roughness
Viscosity
Liquids
Substrates
Experiments

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Renewable Energy, Sustainability and the Environment
  • Surfaces, Coatings and Films
  • Electrochemistry
  • Materials Chemistry

Cite this

Electrochemical QCM Studies of Aluminum Deposition and Alloy Formation on Au(111) in Ambient Temperature Molten Salts/Benzene Mixtures. / Lee, Jae Joon; Mo, Yibo; Scherson, Daniel Alberto; Miller, Barry; Wheeler, Kraig A.

In: Journal of the Electrochemical Society, Vol. 148, No. 12, 01.12.2001.

Research output: Contribution to journalArticle

Lee, Jae Joon ; Mo, Yibo ; Scherson, Daniel Alberto ; Miller, Barry ; Wheeler, Kraig A. / Electrochemical QCM Studies of Aluminum Deposition and Alloy Formation on Au(111) in Ambient Temperature Molten Salts/Benzene Mixtures. In: Journal of the Electrochemical Society. 2001 ; Vol. 148, No. 12.
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