Anchoring High-dispersed MnO2 Nanowires on Nitrogen Doped Graphene as Electrode Materials for Supercapacitors

•Nanostructured MnO2/nitrogen doped graphene hybrids were synthesized.•A facile and economic method at low temperature with ammonia pretreatment was used.•The capacitance was up to 275.2 F g−1 and retained 98.3% after 1000 cycles.

Nanostructured MnO2/nitrogen doped graphene (MnO2/N-RGO) hybrids were synthesized by a facile and economic method at low temperature with ammonia pretreatment. Characterizations show nitrogen atoms were embedded into graphene lattice during pretreatment followed by MnO2 nanowires anchored onto graphene flakes. Compared with MnO2/graphene (MnO2/RGO) hybrids, the novel hybrids exhibited higher capacitance value and enhanced cyclic stability. At a current density of 2 mA cm−2, the capacitance of as-obtained hybrids was up to 275.2 F g−1 and retained 98.3% of initial capacitances after 1000 cycles. These results illustrate that ammonia pretreatment is effective for nitrogen atom doping and the hybrids are potential as electrode materials for supercapacitors.

Graphical AbstractFigure optionsDownload full-size imageDownload as PowerPoint slideThe capacitance of as-obtained hybrids was up to 275.2 F g−1 and retained 98.3% of initial capacitances after 1000 cycles