Electrodeposition of manganese oxide from eutectic urea/choline chloride ionic liquid: An in situ study based on soft X-ray spectromicroscopy and visible reflectivity

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• 作者：Benedetto Bozzini^a ; ^{benedetto.bozzini@unisalento.it} ; Alessandra Gianoncelli^b ; Burkhard Kaulich^b ; Claudio Mele^a ; Mauro Prasciolu^c ; Maya Kiskinova^b
• 关键词：Manganese oxide ; Manganese ; Ionic liquid ; Electrodeposition ; X-ray microspectroscopy ; Reflectivity
• 刊名：Journal of Power Sources
• 出版年：2012
• 期刊代码：58_03787753
• 类别：ce
• 出版时间：1 August, 2012
• 卷：211
• 期：Complete
• 页码：71-76
• 文件大小：957 K

摘要

In this work, we describe a novel approach to the fabrication of MnO₂, consisting in Mn electrodeposition from a choline chloride/urea eutectic ionic liquid bath followed by controlled electrochemical oxidation in an aqueous solution. Both electrodeposition and electro-oxidation processes have been studied by electrochemical and in situ spectroelectrochemical approaches. Synchrotron-based soft X-ray scanning microscopy and absorption spectroscopy were used to measure in situ the Mn valence distribution on the electrodes and within the cell. The oxidation process was followed in situ by visible reflectivity measurements: the different stages of the oxidation process could be discriminated dynamically on the basis of relative reflectivity changes. The capacitance of the electrochemically fabricated films has been measured with cyclic voltammetry and electrochemical impedance spectrometry.