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Materials 2019, 12(8), 1245;

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

Functional Composite Materials Research Center, Korea Institute of Science and Technology (KIST) Jeonbuk Institute of Advanced Composite Materials, 92 Chudong-ro, Bongdong-eup, Wanju-gun, Jeollabuk-do 55324, Korea
School of Chemical Engineering, Chonbuk National University, Jeon-ju, Jeollabuk-do 54896, Korea
Authors to whom correspondence should be addressed.
Received: 28 February 2019 / Revised: 9 April 2019 / Accepted: 11 April 2019 / Published: 16 April 2019
(This article belongs to the Special Issue Smart Nanomaterials for Environmental Remediation)
PDF [15894 KB, uploaded 16 April 2019]


One-pot synthesis of mixed-valence manganese oxide (MnOx)/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 MnOx and by directly annealing the rGO without tedious purification steps, as described herein, MnOx/rGO composites with a high specific capacitance of 1955.6 F g−1 at a current density of 1 A g−1 are achieved. It is found that the presence of potassium ions helps in the development of mixed-valence MnOx on the surface of the rGO. View Full-Text
Keywords: manganese oxide; reduced graphene oxide; nanocomposite; graphene manganese oxide; reduced graphene oxide; nanocomposite; graphene

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Jang, W.; Jeon, D.-Y.; Lee, Y.-S.; Koo, H.Y. Effect of Potassium Ions on the Formation of Mixed-Valence Manganese Oxide/Graphene Nanocomposites. Materials 2019, 12, 1245.

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