LaxSr1 xCo0.1Mn0.9O3 (delta) (0.3 <= x <= 1) perovskite nanofibers (LNF- x) are firstly prepared by a simple electrospinning method. The microstructure, morphology and electrochemical properties of LaxSr1 xCo0.1Mn0.9O3 (delta) (0.3 <= x <= 1) are systematically studied through scanning electron microscopy (SEM), X- ray powder diffraction (XRD), transmission electron microscopy (TEM), Brunauer- EmmettTeller (BET) surface area measurements and electrochemical analyzer etc. The results show that the nanofibers maintain the fibrous structure with perovskite phase after annealed at 700 degrees C. And with the increase of Sr content in LaxSr1 xCo0.1Mn0.9O3 (delta) (0.3 <= x <= 1), the diameter range of the samples tend to decrease and the roughness of surface enlarge as well. Furthermore, when 1 M KOH electrolyte is employed, a maximum capacitance of 485 Fg (1) at a current density of 1 Ag (1) is achieved for the LNF- 0.7 as electrode material. (C) 2014 Elsevier B. V. All rights reserved.