Effect of Potassium Ions on the Formation of Mixed-Valence Manganese Oxide/Graphene Nanocomposites

One-pot synthesis of mixed-valence manganese oxide (MnO<sub>x</sub>)/potassium ion-doped reduced graphene oxide (rGO) composites for efficient electrochemical supercapacitors is introduced. Using manganese nitrate and potassium permanganate as co-precursors for the MnO<sub>x</su...

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Bibliographic Details
Main Authors: Wooree Jang, Dae-Young Jeon, Youn-Sik Lee, Hye Young Koo
Format: Article
Language:English
Published: MDPI AG 2019-04-01
Series:Materials
Subjects:
Online Access:https://www.mdpi.com/1996-1944/12/8/1245
Description
Summary:One-pot synthesis of mixed-valence manganese oxide (MnO<sub>x</sub>)/potassium ion-doped reduced graphene oxide (rGO) composites for efficient electrochemical supercapacitors is introduced. Using manganese nitrate and potassium permanganate as co-precursors for the MnO<sub>x</sub> and by directly annealing the rGO without tedious purification steps, as described herein, MnO<sub>x</sub>/rGO composites with a high specific capacitance of 1955.6 F g<sup>&#8722;1</sup> at a current density of 1 A g<sup>&#8722;1</sup> are achieved. It is found that the presence of potassium ions helps in the development of mixed-valence MnO<sub>x</sub> on the surface of the rGO.
ISSN:1996-1944