Electrochemical Preparation of La-Fe Alloy Films in Dimethylsulfoxide (DMSO)
来源期刊：JOURNAL OF RARE EARTHS2002年第3期
论文作者：袁定胜 童叶翔 刘冠昆
Key words：rare earths; lanthanum; electrodeposition; DMSO; La-Fe alloy films; diffusion coefficient; transfer coefficient;
Abstract: The cyclic voltammetry and potential step methods were used to investigate the electrochemical behavior of Fe2+ and La3+ in FeCl2-LiCl-DMSO and LaCl3-LiCl-DMSO systems on Pt, Cu and Ni cathodes. The electroreduction of Fe2+ to Fe is irreversible in one step,while the electroreduction of La3+ to La is quasi-reversible. The diffusion coefficient of La3+ in LaCl3-LiCl-DMSO system at 298 K was 3.1×10-6 cm2s-1. The diffusion coefficient and transfer coefficient of Fe2+ in FeCl2-LiCl-DMSO system at 298 K were 2.54×10-6 cm2*s-1 and 0.24, respectively. La-Fe alloy films containing La from 22.7% to 37.1% (mass fraction) were prepared by potentiostatic electrolysis on Cu substrates at a deposition potential from -1.750 to -2.450 V (vs SCE). The fine La-Fe alloy films were also obtained by pulse electrolysis at a pulse current densities from 2 to 6 mA*cm-2. The surfaces of these alloy films are smooth, adhesive and uniform, and have metallic luster.
袁定胜1，童叶翔1，刘冠昆1
(1.School of Chemistry and Chemical Engineering, Zhongshan University, Guangzhou 510275, China)
Abstract:The cyclic voltammetry and potential step methods were used to investigate the electrochemical behavior of Fe2+ and La3+ in FeCl2-LiCl-DMSO and LaCl3-LiCl-DMSO systems on Pt, Cu and Ni cathodes. The electroreduction of Fe2+ to Fe is irreversible in one step,while the electroreduction of La3+ to La is quasi-reversible. The diffusion coefficient of La3+ in LaCl3-LiCl-DMSO system at 298 K was 3.1×10-6 cm2s-1. The diffusion coefficient and transfer coefficient of Fe2+ in FeCl2-LiCl-DMSO system at 298 K were 2.54×10-6 cm2*s-1 and 0.24, respectively. La-Fe alloy films containing La from 22.7% to 37.1% (mass fraction) were prepared by potentiostatic electrolysis on Cu substrates at a deposition potential from -1.750 to -2.450 V (vs SCE). The fine La-Fe alloy films were also obtained by pulse electrolysis at a pulse current densities from 2 to 6 mA*cm-2. The surfaces of these alloy films are smooth, adhesive and uniform, and have metallic luster.
Key words:rare earths; lanthanum; electrodeposition; DMSO; La-Fe alloy films; diffusion coefficient; transfer coefficient;
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