The electrodeposition of aluminium on glassy carbon and aluminium substrates from AlCl3-urea deep eutectic solvent(DES) system at near room temperatures was investigated,without additional purification of the chemical...The electrodeposition of aluminium on glassy carbon and aluminium substrates from AlCl3-urea deep eutectic solvent(DES) system at near room temperatures was investigated,without additional purification of the chemicals used to prepare the electrolyte and without rigorous control of moisture and oxygen present in the working space.The effects of changing temperature,working potential,controlled deposition current density and deposition time on the morphology of deposited aluminium without stirring of the electrolyte were recorded.Using potentiostatic and galvanostatic techniques,aluminium was electrodeposited from the deep eutectic solvent(n(AlCl3):n(urea)=1.6:1) onto glassy carbon and aluminium substrates at temperatures ranging from 25 to 50℃.Using SEM,EDS and XRD techniques,substrates were studied and confirmed the presence of aluminium deposits following both potentiostatic and galvanostatic regimes.The shape and size of Al grains deposited depended on the time of deposition and varied in size from nanometers to micrometers and in shape from regular crystal forms to needle-like and flake-like structures.展开更多
Solubilities and conductivities of anhydrous AlCl3 in six kinds of ionic liquids (ILs) were measured. Among the six kinds of ILs [bmim]Cl, [bmim]Br, [bmim]BF4, [bmim]PF6, [emim][EtSO4] and [bmim][HSO4], anhydrous AlCl...Solubilities and conductivities of anhydrous AlCl3 in six kinds of ionic liquids (ILs) were measured. Among the six kinds of ILs [bmim]Cl, [bmim]Br, [bmim]BF4, [bmim]PF6, [emim][EtSO4] and [bmim][HSO4], anhydrous AlCl3 could be dissolved in the first five kinds but was hardly dissolved in [bmim][HSO4]. The results showed that the nominal solubilities of AlCl3 in ILs increased in the order of [bmim][HSO4] < [bmim]PF6 < [emim][EtSO4] < [bmim]BF4 < [bmim]Cl < [bmim]Br. Conductivities of the AlCl3/ILs systems depended apparently on the nominal molar ratio of AlCl3 to ILs. The conductivities of AlCl3/[bmim]Cl, AlCl3/[bmim]Br and AlCl3/[bmim]PF6 systems had a similar tendency as a function of the nominal molar ratio, that is, as the molar ratio was increased, conductivities increased first and then decreased, with the maximum conductivity obtained at approximately 0.9:1, 1.0:1 and 0.5:1, respectively. Conductivities of the AlCl3/[bmim]BF4 exhibited a dentate change and decreased with the molar ratio of AlCl3 to [bmim]BF4 increasing in general. With the increasing of the anhydrous AlCl3 amount in [emim][EtSO4], conductivity of AlCl3/[emim][EtSO4] monotonically decreased. AlCl3/[bmim]Cl system was chosen as the electrolyte for the electrodeposition of Al. Preliminary experimental results showed that dense, adherent and homogeneous Al coatings could be electrodeposited on stainless steel by means of constant potential technique and the surface coverage was quite satisfactory.展开更多
基金supported by the Ministry of Education, Science and Technological Development of the Republic of Serbia (Grant No. 172060)
文摘The electrodeposition of aluminium on glassy carbon and aluminium substrates from AlCl3-urea deep eutectic solvent(DES) system at near room temperatures was investigated,without additional purification of the chemicals used to prepare the electrolyte and without rigorous control of moisture and oxygen present in the working space.The effects of changing temperature,working potential,controlled deposition current density and deposition time on the morphology of deposited aluminium without stirring of the electrolyte were recorded.Using potentiostatic and galvanostatic techniques,aluminium was electrodeposited from the deep eutectic solvent(n(AlCl3):n(urea)=1.6:1) onto glassy carbon and aluminium substrates at temperatures ranging from 25 to 50℃.Using SEM,EDS and XRD techniques,substrates were studied and confirmed the presence of aluminium deposits following both potentiostatic and galvanostatic regimes.The shape and size of Al grains deposited depended on the time of deposition and varied in size from nanometers to micrometers and in shape from regular crystal forms to needle-like and flake-like structures.
基金National Natural Science Foundation of China(No.20776140)National Science Fund for Distinguished Young Scholars of China(No.20625618)National863Program of China(No.2006AA06Z317)
文摘Solubilities and conductivities of anhydrous AlCl3 in six kinds of ionic liquids (ILs) were measured. Among the six kinds of ILs [bmim]Cl, [bmim]Br, [bmim]BF4, [bmim]PF6, [emim][EtSO4] and [bmim][HSO4], anhydrous AlCl3 could be dissolved in the first five kinds but was hardly dissolved in [bmim][HSO4]. The results showed that the nominal solubilities of AlCl3 in ILs increased in the order of [bmim][HSO4] < [bmim]PF6 < [emim][EtSO4] < [bmim]BF4 < [bmim]Cl < [bmim]Br. Conductivities of the AlCl3/ILs systems depended apparently on the nominal molar ratio of AlCl3 to ILs. The conductivities of AlCl3/[bmim]Cl, AlCl3/[bmim]Br and AlCl3/[bmim]PF6 systems had a similar tendency as a function of the nominal molar ratio, that is, as the molar ratio was increased, conductivities increased first and then decreased, with the maximum conductivity obtained at approximately 0.9:1, 1.0:1 and 0.5:1, respectively. Conductivities of the AlCl3/[bmim]BF4 exhibited a dentate change and decreased with the molar ratio of AlCl3 to [bmim]BF4 increasing in general. With the increasing of the anhydrous AlCl3 amount in [emim][EtSO4], conductivity of AlCl3/[emim][EtSO4] monotonically decreased. AlCl3/[bmim]Cl system was chosen as the electrolyte for the electrodeposition of Al. Preliminary experimental results showed that dense, adherent and homogeneous Al coatings could be electrodeposited on stainless steel by means of constant potential technique and the surface coverage was quite satisfactory.
