Effects of Organic Additives Containing Carbonyl Group on Electrodeposition of Al from AlCl3-[Emim]Cl Ionic Liquid

doi:10.6023/A14120857

Acta Chim. Sinica ›› 2015, Vol. 73 ›› Issue (5): 403-408.DOI: 10.6023/A14120857 Previous Articles Next Articles

Article

含羰基有机添加剂对AlCl₃-[Emim]Cl电沉积铝的影响

冷明浩^a,b, 陈仕谋^b, 张军玲^b, 郎海燕^b, 康艳红^b, 张锁江^b

a 沈阳师范大学化学与生命科学学院沈阳 110034;
b 中国科学院过程工程研究所绿色过程与工程院重点实验室北京 100190

投稿日期:2014-12-12 发布日期:2015-04-01
通讯作者: 张锁江 E-mail:sjzhang@home.ipe.ac.cn
基金资助:
项目受国家重点基础研究发展计划(No. 2015CB251401), 国家科技支撑计划(No. 2012BAF03B01)和国家自然科学基金项目(No. 21127011, 51274181)资助.

Effects of Organic Additives Containing Carbonyl Group on Electrodeposition of Al from AlCl₃-[Emim]Cl Ionic Liquid

Leng Minghao^a,b, Chen Shimou^b, Zhang Junling^b, Lang Haiyan^b, Kang Yanhong^b, Zhang Suojiang^b

a College of Chemistry and Life Science, Shenyang Normal University, Shenyang 110034;
b Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190

Received:2014-12-12 Published:2015-04-01
Supported by:
Project supported by the National Key Basic Research Program of China (No. 2015CB251401), the Key Technologies R&D Program (No. 2012BAF03B01), the Special Funds of the National Natural Science Foundation of China (No. 21127011) and the General Program of National Natural Science Foundation of China (No. 51274181).

1. Effects of Organic Additives Containing Carbonyl Group on Electrodeposition of Al from AlCl₃-[Emim]Cl Ionic Liquid.PDF(1020KB)

Abstract

Electrodeposition of Al in ionic liquids for preparation of aluminum products had opened up a new research direction, but the previous studies found that aluminum product from pure ionic liquid electrodeposition was unable to meet the requirements in both uniformity and smoothness. Electrodepostion in pure ionic liquid often results in the deposits with rough surface or even dendritic products after long-time deposition. In this study, five kinds of small organic molecules containing carbonyl as additives were investigated, such as acetone, acetic acid amide, acetic acid, methyl acetate and methyl carbamate. Additives were added to [Emim]Cl/AlCl₃(33.3/66.7 mol%) with a concentration of 5 mmol/L, 15 mmol/L, 45 mmol/L. Cyclic voltammetry was studied on a glassy carbon electrode at a scan rate of 100 mV·s^-1 and temperature of 323 K. The electrode potential was scanned from the open circuit potential to negative-potential, then retraced to get cyclic voltammetry curve. Among those organic additives, methyl carbamate was proved to be an excellent additive. The brightness of Al can be improved by adding 45 mmol/L methyl carbamate. Smooth, uniform and mirror bright Al deposition would be obtained afterward. Furthermore, the effects of additive for Al deposit on morphology, crystal orientation and Al deposition mechanism by the analysis of galvanostatic deposition, scanning electron microscope (SEM), X-ray diffraction (XRD), ultraviolet-visible spectroscopy (UV-Vis) and nuclear magnetic resonance (NMR) was conjectured. The results showed that methyl carbamate as an additive would make grain refinement more apparent and present more strong Al(200) crystal plane orientation. As an additive, methyl carbamate did not form new metal complex in the electrolytic liquid and did not affect the structure of active aluminum ion in the electrolyte. The positive center of carbonyl carbon atom in methyl carbamate molecular can be easily adsorbed at the cathode surface. This procedure inhibited the process of Al deposition and obtained the smooth and bright effect. Therefore, Al deposition layer of mirror can be obtained, which has an important guiding significance in the selection of ionic liquid additive in electrodeposition system.

Key words: ionic liquids, electrodeposition, carbonyl, methyl carbamate, additives

Cite this article

Leng Minghao, Chen Shimou, Zhang Junling, Lang Haiyan, Kang Yanhong, Zhang Suojiang. Effects of Organic Additives Containing Carbonyl Group on Electrodeposition of Al from AlCl₃-[Emim]Cl Ionic Liquid[J]. Acta Chim. Sinica, 2015, 73(5): 403-408.

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含羰基有机添加剂对AlCl₃-[Emim]Cl电沉积铝的影响

Effects of Organic Additives Containing Carbonyl Group on Electrodeposition of Al from AlCl₃-[Emim]Cl Ionic Liquid

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含羰基有机添加剂对AlCl3-[Emim]Cl电沉积铝的影响