Graphene Oxide/MnO₂ Composites Synthesized by "Quenching" for Supercapacitors with High Capacitance

Abstract:

Graphene Oxide (GO)/manganese oxide (MnO₂) composites with different feeding ratio are synthesized by a simple and economic soft chemical route in a water-isopropyl alcohol under different cooling method. The SEM results show that MnO₂ nanoparticle with smaller size (8nm) homogeneously coats on the surfaces of graphene oxide under quick ice quenching, and the better electrochemical properties is obtained. The composites with feeding ratio 1:9 have maximum capacitance value, because of agglomerate induced by too much MnO₂. The specific capacitances calculated by galvanostatic charge/discharge curve were 312.87 F/g by ice water quenching and 253.12 F/g by reflux cooling to room temperature. The GO/MnO₂ electrode retained about 85.12% (with quick ice quenching) and 88.16% (with reflux cooling) of initial capacitance after 1000 cycles, respectively.

• Periodical: Solid State Phenomena (Volume 278)
• Pages: 121-129
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.278.121
• Online since: July 2018
• Authors: Zhen Ye Zhu*
• Keywords: Graphene Oxide, Nanomanganese Oxide, Supercapacitors, Water-Isopropyl Alcohol

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