High mass loading flower-like MnO on NiCoO deposited graphene/nickel foam as high-performance electrodes for asymmetric supercapacitors.

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.