Electrochemical Behaviors of Fe2+ and Sm3+ in Urea-NaBr Low Temperature Melt and Their Inductive Codeposition
来源期刊：JOURNAL OF RARE EARTHS2001年第4期
论文作者：杨绮琴 刘莉治 童叶翔 刘鹏
Abstract: The cyclic voltammetry, chronopotentiometry and chronoamperometry were used to study the behaviors of Fe2+ on Pt, Cu, Ag and Ti electrodes in urea-NaBr melt at 373 K. Electroreduction of Fe2+ to metallic Fe is irreversible in one step. The exchange current density determined on Ti electrode is 2.68×10-5 A·cm-2. Sm3+ does not reduce to Sm alone, but can be inductively codeposited with Fe2+. Sm-Fe alloy film contained over 90% Sm (mass fraction) can be obtained by potentiostatic electrolysis and galvanostatic electrolysis on Cu substrate. The Sm content in the alloy is related to the cathode potential, current density and the Sm3+/Fe2+ molar ratio. The surface state of the Sm-Fe deposit was studied by scanning electron microscopy.
杨绮琴1，刘莉治1，童叶翔1，刘鹏1
(1.School of Chemistry and Chemical Engineering, Zhongshan University,)
Abstract:The cyclic voltammetry, chronopotentiometry and chronoamperometry were used to study the behaviors of Fe2+ on Pt, Cu, Ag and Ti electrodes in urea-NaBr melt at 373 K. Electroreduction of Fe2+ to metallic Fe is irreversible in one step. The exchange current density determined on Ti electrode is 2.68×10-5 A·cm-2. Sm3+ does not reduce to Sm alone, but can be inductively codeposited with Fe2+. Sm-Fe alloy film contained over 90% Sm (mass fraction) can be obtained by potentiostatic electrolysis and galvanostatic electrolysis on Cu substrate. The Sm content in the alloy is related to the cathode potential, current density and the Sm3+/Fe2+ molar ratio. The surface state of the Sm-Fe deposit was studied by scanning electron microscopy.
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