Pseudocapacitance of MnO2 originates from reversible insertion/desertion of thiocyanate anions studied using in situ X-ray absorption spectroscopy in ionic liquid electrolyte

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

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

31 Scopus citations

Abstract

Charge storage mechanisms of electrodeposited MnO2 in various aprotic ionic liquids (ILs) are studied using in situ X-ray absorption spectroscopy (XAS). The analytical results show that a unique thiocyanate (SCN-) anion can reversibly insert/desert into/from the tunnels between the [MnO6] octahedral subunits depending on the applied potential. This process charge compensates the Mn3+/Mn4+ redox transition upon charging-discharging and thus contributes to an ideal pseudocapacitive behavior of the MnO2 electrode. The present work would open up a route for developing a novel oxide-based supercapacitor, with high cell-voltage, high thermal stability, and high safety, incorporating IL electrolytes.

Original languageEnglish
Pages (from-to)919-922
Number of pages4
JournalJournal of Power Sources
Volume195
Issue number3
DOIs
StatePublished - 1 Feb 2010

Keywords

  • Energy storage
  • In situ X-ray adsorption spectroscopy (XAS)
  • Insertion/desertion
  • Ionic liquid electrolyte
  • Mn oxide
  • Pseudocapacitance

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