Structure, morphology and electrochemical properties of LaxSr1−xCo0.1Mn0.9O3−δ perovskite nanofibers prepared by electrospinning method

La x Sr 1 − x Co 0.1 Mn 0.9 O 3 − δ (0.3   ⩽   x   ⩽   1) perovskite nanofibers (LNF- x ) are firstly prepared by a simple electrospinning method. The microstructure, morphology and electrochemical properties of La x Sr 1 − x Co 0.1 Mn 0.9 O 3 − δ (0.3   ⩽   x   ⩽   1) are systematically studied through scanning electron microscopy (SEM), X-ray powder diffraction (XRD), transmission electron microscopy (TEM), Brunauer–Emmett–Teller (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   °C. And with the increase of Sr content in La x Sr 1 − x Co 0.1 Mn 0.9 O 3 − δ (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   F   g −1 at a current density of 1   A   g −1 is achieved for the LNF-0.7 as electrode material.