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Hierarchical MnO2 nanosheets standing on hollow NiO microspheres have been designed by a facile hydrothermal process. Furthermore, asymmetric supercapacitors via core/shell NiO/MnO2 cathode and biochar anode were assembled.doi:10.1039/c9ra09142d fatcat:tnxspgsj6zardal37qfpkimvku