Fabrication of ultrafine manganese oxide-decorated carbon nanofibers for high-performance electrochemical capacitors

Morphology controlled synthesis of Mn, Zn-containing metal organic framework fibers was carried out by varying the assembly time. Such a fiber precursor was converted to a new type of ultrafine manganese oxide-decorated carbon nanofiber upon pyrolyzed. This synthesis integrates excellent accessibility, high porosity, tight contact and superior conductivity in the final products, and thus exhibits a remarkable capacitance of up to 18290Fg−1 per active mass of the manganese(IV) oxide, high stability of cycling up to 5000 times, as well as the maximum energy density is up to 19.7Whkg−1 at the current density of 0.25Ag−1. [Display omitted] •Facile synthesis of MnOn-CNF composites by construction and evolution of Mn-ZnBTC fibers.•Excellent accessibility, high porosity, tight contact and superior conductivity are integrated.•Remarkable capacitance of up to 18290Fg−1 per active mass of the manganese(IV) oxide.•Superior stability of cycling up to 5000 times with a high capacitance retention ratio of 98%. Ultrafine manganese oxide-decorated carbon nanofibers (MnOn-CNF, 1.3