Preparation and Electrochemical Properties of Graphene/MnO₂ Nanocomposites for Supercapacitors

Abstract:

In the present work, we demonstrated a facile process to prepare graphene/MnO₂ composites via a simple hydrothermal method at 120 °C using KMnO₄ and graphene oxide as raw materials followed by reduction with or without hydrazine. The electrochemical performance of the graphene/MnO₂ composites were investigated in a neutral electrolyte of Na₂SO₄. Among these samples, the sample rGM₃ prepared without hydrazine show uniform morphology and the best electrochemical performance. The specific capacitance of rGM₃ is 169 F g^-1 at a specific current of 0.2 A g^-1. It exhibits a maintenance of 75.5 % of the initial capacitance after 1000 cycles. The results manifest that the graphene/MnO₂ composites can be potentially applied in supercapacitors.

• Periodical: Key Engineering Materials (Volume 768)
• Pages: 102-108
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.768.102
• Online since: April 2018
• Authors: Hai Bo Sun, Hua Zhi Gu, Yao Chen*
• Keywords: Composite, Graphene/MnO₂, Hydrothermal Method

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