Hybrid Reduced Graphene Oxide Nanosheet Supported Mn-Ni-Co Ternary Oxides for Aqueous Asymmetric Supercapacitors

ACS Applied Materials & Interfaces
Chun WuKaili Zhang

Abstract

Hybrid reduced graphene oxide (RGO) nanosheet supported Mn-Ni-Co ternary oxides (MNCO) are prepared through a facile coprecipitation reaction with a subsequent calcination process as electrodes for supercapacitors. Electrochemical measurements prove that RGO can significantly improve the supercapacitive behaviors, compared with the pure MNCO electrode. A high specific capacity of 646.1 C g-1 at 1 A g-1 can be achieved and about 89.6% of the capacity can be remained at 30 A g-1 relative to that of the low-current capacity, indicating attractive rate capability of the RGO-MNCO electrode. Moreover, an asymmetric supercapacitor (ASC) device is fabricated with nitrogen-enriched RGO as the negative electrode and the synthesized RGO-MNCO as the positive electrode. Electrochemical performances investigated at different potential range reveal that the ASC device presents excellent capacitive behavior and reversibility. A maximum energy density of 35.6 Wh kg-1 at power density of 699.9 W kg-1 can be delivered. Furthermore, stable cycle capability with 100% Coulombic efficiency and 77.2% the capacitance retention is also achieved after 10000 cycles. The achieved outstanding electrochemical properties indicate that the obtained RGO-MNCO el...Continue Reading

References

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Citations

Apr 22, 2021·Dalton Transactions : an International Journal of Inorganic Chemistry·Kausik SardarKalyan Kumar Chattopadhyay
Apr 4, 2020·Nano-micro Letters·Saravanakumar BalasubramaniamAnanthakumar Ramadoss

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