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Pseudocapacitive Mechanism of Manganese Oxide in 1-ethyl-3-methylimidazolium Thiocyanate Ionic Liquid Electrolyte Studied Using X-ray Photoelectron Spectroscopy

Pseudocapacitive Mechanism of Manganese Oxide in 1-ethyl-3-methylimidazolium Thiocyanate Ionic Liquid Electrolyte Studied Using X-ray Photoelectron Spectroscopy

Jeng-Kuei Chang, Ming-Tsung Lee, Wen-Ta Tsai, Ming-Jay Deng, Hui-Fang Cheng, I-Wen Sun

Langmuir. 2009 Oct 6;25(19):11955-60.

PMID: 19621902

Abstract:

The electrochemical behavior of anodically deposited manganese oxide was studied in pyrrolidinium formate (P-HCOO), 1-butyl-3-methylimidazolium hexafluorophosphate (BMI-PF6), and 1-ethyl-3-methylimidazolium thiocyanate (EMI-SCN) ionic liquids (ILs). The experimental data indicate that the Mn oxide electrode showed ideal pseudocapacitive performance in aprotic EMI-SCN IL. In a potential window of approximately 1.5 V, the oxide specific capacitance, evaluated using cyclic voltammetry and chronopotentiometry, was about 55 F/g. The electrochemical energy storage reaction was examined using X-ray photoelectron spectroscopy (XPS). It was confirmed that the SCN- anions, instead of the EMI+ cations, were the primary working species that can become incorporated into the oxide and thus compensate the Mn3+/Mn4+ valent state variation upon the charge-discharge process. According to the analytical results, a pseudocapacitive mechanism of Mn oxide in the SCN- based aprotic IL was proposed.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP331717636	1-Ethyl-3-methylimidazolium thiocyanate		331717-63-6	Price

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