This paper reports the electrochemical properties of various silver-manganese oxide carbon nanofiber-based composites (AgOx-MnOx/CNF). The various polyacrylonitrile (PAN)-based solutions; PAN, AgNO3/PAN, Mn(NO3)(2)/PAN, and AgNO3- Mn(NO3)(2)/PAN were dissolved in N,N-dimethylformamide (DMF) as the precursors. The four-nozzle electrospinning system was employed to obtain nanofibers. The electrospun precursors were calcined using a tubular quartz furnace including stabilization, carbonization, and activation under air, argon, and CO2 atmosphere, respectively. The calcined samples were named as CNF, AgOx-/CNF, MnOx/CNF, AgOx-MnOx/CNF dependent on each composite. Morphological, structural, textural properties were characterized, and supercapacitor performances were studied by cyclic voltammetry, galvanostatic charge/discharge, and electrochemical impedance spectroscopy. The calcined fibers were obtained as a paper-like sheet thickness of similar to 30-60 mm, they had several diameters of similar to 237-643 nm depending on each composite. Among the samples, the AgOx-MnOx/CNF which had a high specific surface area of 812 m(2) g(-1) expressed the highest specific capacitance of nearly 204 F g(-1) and energy density of similar to 28 mW h g(-1) at a power density of similar to 250 mW g(-1). Moreover, it also displayed imposing cycling capability of more than 99% after 1000 cycles of charge/discharge. In addition, the other remarkable results have been also discussed. (C) 2016 Elsevier B.V. All rights reserved.