Hydrothermal Synthesis of MnO<sub>2</sub>-Loaded Porous Carbons for Supercapacitors

The porous carbons have been prepared by chemical activation using commercial activated carbons as precursors and KOH as the chemical agent, and the MnO 2 and MnO 2 -loaded porous carbons have been synthesized via the hydrothermal method using the Mn (SO 4 ) 2 ·H 2 O and (NH 4 ) 2 S 2 O 8 as the reagents. The morphology and structure of the obtained materials are characterized by the SEM, XRD and N 2 sorption. The obtained MnO 2 exhibits rod-like morphology, which can be indexed to a pure tetragonal phase [space group: P 4 2 / mnm ] of β -MnO 2 . The porous carbons and MnO 2 -loaded porous carbons show a well-developed porosity. The electrochemical tests indicate that the samples have excellent performances for the supercapacitors.