Electrosynthesis and characterization of nanostructured MnO₂ deposited on stainless steel electrode: a comparative study with commercial EMD

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• 作者：Fatsah Moulai ; Nabila Cherchour ; Bouzid Messaoudi ; Larbi Zerroual
• 关键词：MnO2 ; Nanostructures ; EIS ; MnO2/zinc battery ; Performance
• 刊名：Ionics
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：23
• 期：2
• 页码：453-460
• 全文大小：
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Electrochemistry; Renewable and Green Energy; Optical and Electronic Materials; Condensed Matter Physics; Energy Storage;
• 出版者：Springer Berlin Heidelberg
• ISSN：1862-0760
• 卷排序：23

文摘

The nanostructured MnO₂ powder was successfully synthesized by electrodeposition on stainless steel (SS) substrate from hot 0.3 M MnSO₄·H₂O aqueous solution with pH value adjusted to 2. The electrochemical behavior of synthesized MnO₂ was compared to that of the commercial electrolytic manganese dioxide (EMD). The investigation was conducted using a new cell which is manufactured in our laboratory. This gave us the possibility to present a new contribution and an improvement in the study of MnO₂ electrochemical behavior. The analysis of the synthesized MnO₂ and EMD powders by different techniques: FEG-SEM, EDS, TEM, XRD, and BET revealed the presence of electrodeposited nanostructured γ-MnO₂ with high specific surface area of 139.59 m2 g−1 for the nanostructured MnO₂ and 46.60 m2 g−1 for EMD. The electrochemical study of these powders conducted by linear voltammetry, electrochemical impedance spectroscopy (EIS) measurements, and Zn/MnO₂ battery tests in 0.1 M NH₄Cl electrolyte showed that the performance of the synthesized nanostructured MnO₂ powder was higher than that of the commercial EMD powder.