The implementation of high mass loading MnO on electrochemical electrodes of supercapacitors is currently challenging due to the poor electrical conductivity and elongated electron/ion transport distance. In this paper, a NiCoO/MnO heterostructure was built on the surface of three-dimensional graphene/nickel foam (GNF) by a hydrothermal method. The petal structured NiCoO loaded on graphene played a wonderful role as a supporting framework, which provided more space for the growth of high mass loading MnO microflowers, thereby increasing the utilization rate of the active material MnO. The GNF@NiCoO/MnO composite was used as a positive electrode and achieved a high areal capacitance of 1630.5 mF cm at 2 mA cm in the neutral NaSO solution. The asymmetric supercapacitor assembled with the GNF@NiCoO/MnO positive electrode and activated carbon negative electrode possessed a wide voltage window (2.1 V) and splendid energy density (45.9 Wh kg), which was attributed to the satisfactory electroactive area, low resistance, quick mass diffusion and ion transport caused by high mass loading MnO.
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| http://dx.doi.org/10.1039/d0ra10948g | DOI Listing |
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