In situ engineering of urchin-like reduced graphene oxide–Mn2O3–Mn3O4 nanostructures for supercapacitors

Loading...
Thumbnail Image

Date

Authors

Chidembo, Alfred Tawirirana
Aboutalebi, Seyed Hamed
Konstantinov, Konstantin
Jafta, Charl Jeremy
Liu, Hua Kun
Ozoemena, Kenneth I.

Journal Title

Journal ISSN

Volume Title

Publisher

Royal Society of Chemistry

Abstract

We report the use of a spray pyrolysismethod to synthesize high surface area (BET surface area of 139m2 g 1) self-organized, micron sized urchin-like composites made up of reduced graphene oxide and needle-shaped manganese oxide (rGO–Mn2O3–Mn3O4). Maximum capacitances of 425 Fg 1 at 5 mV s 1 from a three electrode set up and 133 Fg 1 at a current density of 0.2 Ag 1 were recorded using an asymmetric two electrode set up with graphene as the anode. The composite material also showed a capacitance retention of 83% over 1000 cycles. We attribute this remarkable performance to the high specific surface area due to the urchin-like hollow structures and synergy between the manganese oxide and reduced graphene oxide materials within the composite. Furthermore, this synthesis technique can be exploited further in the bulk synthesis of cost effective graphene–metal oxide hybrid materials for energy storage applications.

Description

Keywords

In situ engineering

Sustainable Development Goals

Citation

Chidembo, AT, Aboutalebi, SH, Konstantinov, K, Jafta, CJ, Liu, HK & Ozoemena, KI 2014, 'In situ engineering of urchin-like reduced graphene oxide-Mn2O3-Mn3O4 nanostructures for supercapacitors', RSC Advances, vol. 4, no. 2, pp. 886-892.