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Issue 6, 2015
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Electrochemical preparation of nanostructured lanthanum using lanthanum chloride as a precursor in 1-butyl-3-methylimidazolium dicyanamide ionic liquid

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Abstract

Nanostructured lanthanum was electrochemically prepared on a platinum (Pt) substrate in the room temperature ionic liquid 1-butyl-3-methylimidazolium dicyanamide (BMI-DCA) containing anhydrous LaCl3 at 333 K. The electrochemical reduction behavior of La(III) was investigated using cyclic voltammetry and chronoamperometry techniques. Cyclic voltammogram revealed that the reduction of La(III) in BMI-DCA involved an irreversible process controlled by diffusion. Chronoamperometric transient analysis confirmed the diffusion controlled electrodeposition process with the diffusion coefficient of La(III) species in the range of 10−10 cm2 s−1. The strong complexing capability of DCA anions facilitated the displacement of chloride ligands and induced the solubility of LaCl3. The subsequent coordination of La(III) and DCA anions forming [La(DCA)4] complex anions was monitored by designing amperometric titration experiments. Potentiostatically deposited La-deposits with different nanostructures were characterized by SEM, XRD and XPS analyses. The electrodeposition potential was found to play an important role in controlling the nucleation and growth kinetics of the nanocrystal during the electrodeposition process. Depending on the deposition potential, metallic lanthanum with either nanoparticles or nanoporous structures was obtained.

Graphical abstract: Electrochemical preparation of nanostructured lanthanum using lanthanum chloride as a precursor in 1-butyl-3-methylimidazolium dicyanamide ionic liquid

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Publication details

The article was received on 13 Nov 2014, accepted on 08 Jan 2015 and first published on 08 Jan 2015


Article type: Paper
DOI: 10.1039/C4CP05266H
Phys. Chem. Chem. Phys., 2015,17, 4701-4707

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    Electrochemical preparation of nanostructured lanthanum using lanthanum chloride as a precursor in 1-butyl-3-methylimidazolium dicyanamide ionic liquid

    Q. B. Zhang, C. Yang, Y. X. Hua, Y. Li and P. Dong, Phys. Chem. Chem. Phys., 2015, 17, 4701
    DOI: 10.1039/C4CP05266H

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