The Electrochemical Behavior of Aluminum in the Low Temperature Molten Salt System n Butyl Pyridinium Chloride: Aluminum Chloride and Mixtures of This Molten Salt with Benzene

Abstract

The aluminum deposition and stripping processes at tungsten, platinum, and glassy carbon electrodes in the low temperature molten salt system, n butyl pyridinium chloride:aluminum chloride, and the 50 volume percent (v/o) mixture of this molten salt with benzene have been investigated, using a variety of electrochemical techniques. At all three electrodes, and in both solvent systems, the deposition reaction in slightly acidic melts, the reduction of A12C17-ions, was found to involve a nucleation process while at the tungsten and platinum electrodes underpotential deposition was also observed. Reduc-* Electrochemical Society Active Member. 1Present address:) unless CC License in place (see abstract). ecsdl.org/site/terms_use address. Redistribution subject to ECS terms of use (see 134.129.120.3 Downloaded on 2015-05-26 to IP ) unless CC License in place (see abstract). ecsdl.org/site/terms_use address. Redistribution subject to ECS terms of use (see 134.129.120.3 Downloaded on 2015-05-26 to IP ) unless CC License in place (see abstract). ecsdl.org/site/terms_use address. Redistribution subject to ECS terms of use (see 134.129.120.3 Downloaded on 2015-05-26 to IP

Electrochemically active species in aluminum electrodeposition baths of AlCl3/glyme solutions

“…XPS, XRD and SEM observations were carried out for the deposits after washing with pure G2 and vacuum-drying. immersed to the baths [22][23][24]. While large reduction currents and the corresponding oxidation currents (order of mA cm -2 ) were observed for the G2 bath as reported previously [47], only small reduction currents of the order of 0.1 mA cm -2 were observed from near +0.5…”

“…Various kinds of medium-low temperature bath for Al and Al-alloy electroplating have been reported [2]: they include organic solvents (e.g. ethers [3,4], aromatic hydrocarbons [5][6][7][8][9], sulfones [10][11][12][13][14][15][16][17][18] and others [19,20]), and ionic liquids [21][22][23][24][25][26][27][28][29], to name only a few. Some of them are applied to improve the corrosion resistance of magnesium alloys and steel [30][31][32][33].…”

“…In addition, sulfur contamination of deposits has been reported in a sulfone system [17]. RT Ionic liquids are attractive for electroplating baths because they are thermally and chemically stable, less volatile and less flammable [21][22][23][24][25][26][27][28][29]. What is disadvantageous for ionic liquids, compared with organic solvents, is the high cost of the chemicals required for the bath preparation.…”

Speciation of Aluminium in Mixtures of the Ionic Liquids [C3mpip][NTf2] and [C4mpyr][NTf2] with AlCl3: An Electrochemical and NMR Spectroscopy Study

“…[10] Aluminium electrodeposition at ambient temperatures using chloroaluminate ionic liquids has been extensively studied and successfully demonstrated. [4,[11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27] Numerous studies have shown that aluminium electrodeposition from chloroaluminate ionic liquids can only occur from Lewis acidic melts, that is, ones in which the mole fraction of AlCl 3 is greater than 0.5. [28][29][30][31][32] In these melts, the dinuclear Al 2 Cl 7 À species present in solution is the only reducible species within the electrochemical window of the ionic liquid that yields aluminium metal.…”

Aluminum Deposition from Lewis Acidic 1‐Butyl‐3‐Methylimidazolium Chloroaluminate Ionic Liquid ([Bmim]Cl/AlCl3) Modified with Methyl Nicotinate

“…So far, there are four main types of chloroaluminate ILs used for the deposition of Al. Their corresponding cations are N‐alkylpyridinium, N , N ′‐dialkylimidazolium, N‐alkylpyrrolidinium, and trialkyl‐arylammonium . Among them, the most frequently studied are the mixtures of AlCl 3 with N , N ′‐dialkylimidazolium chlorides, especially with 1‐ethyl‐3‐methylimidazolium chloride ([Emim]Cl) or 1‐butyl‐3‐methylimidazolium chloride ([Bmim]Cl), owing to their higher conductivity, lower viscosity, and better stability …”