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首页> 外文期刊>Electrocatalysis >On the Electrodeposition of Niobium from 1-Butyl-l-Methylpyrrolidinium Bis(trifluoromethylsulfonyl)imide at Conductive Diamond Substrates
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On the Electrodeposition of Niobium from 1-Butyl-l-Methylpyrrolidinium Bis(trifluoromethylsulfonyl)imide at Conductive Diamond Substrates

机译：导电金刚石基底上1-丁基-1-甲基吡咯烷鎓双（三氟甲基磺酰基）酰亚胺对铌的电沉积

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摘要

This work relates to the electrochemical deposition of Nb from a liquid solution in which the ionic liquid 1-butyl-1-methylpyrrolidinium bis(trifluoromethylsulfonyl)imide ([BMP][TFSA]) is used as solvent. Conductive diamond was employed as substrate, while the experiments were carried out with NbF5 in the presence of either NaF or LiF Cyclic voltammetries were used to characterise the electrochemical behaviour of the system. Deposition experiments were carried out at fixed potentials, corresponding to the voltammetric peaks of the cathodic scans. The surfaces were characterised by scanning electron microscope-energy dispersive X-ray (SEM-EDX) analysis and the results used in combination with the voltammetries to establish a possible mechanism for the Nb electrodeposition process. The electroreduction of Nb(V) to Nb(0) was found to proceed through different steps, involving the formation of the Nb(II) carbide and other nonstoichiometric carbide phases. The effect of Na and Li ions on the electrochemical process was studied: although three voltammetric peaks were detected in both cases, an appreciable depolarisation of the cathodic reactions was observed in the presence of Li ions. XRD analysis confirmed that a coating of metallic Nb was obtained at-1.5 V and 125 °C in the presence of LiF.
机译：这项工作涉及从液态溶液中电化学沉积Nb的过程，其中离子液体1-丁基-1-甲基吡咯烷鎓双（三氟甲基磺酰基）酰亚胺（[BMP] [TFSA]）被用作溶剂。使用导电金刚石作为基底，而在NaF或LiF存在下用NbF5进行实验。使用循环伏安法表征系统的电化学行为。沉积实验是在固定电位下进行的，该电位对应于阴极扫描的伏安峰。通过扫描电子显微镜-能量色散X射线（SEM-EDX）分析对表面进行表征，并将结果与​​伏安法结合使用，以建立Nb电沉积过程的可能机理。发现将Nb（V）还原为Nb（0）的过程是通过不同的步骤进行的，包括形成Nb（II）碳化物和其他非化学计量的碳化物相。研究了Na和Li离子对电化学过程的影响：尽管在两种情况下均检测到三个伏安峰，但在存在Li离子的情况下，观察到了阴极反应的明显去极化。 XRD分析证实在LiF存在下在-1.5V和125℃下获得金属Nb的涂层。

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