Synthesis of La-doped NiO nanofibers and their electrochemical properties as electrode for supercapacitors

La-doped NiO nanofibers were synthesized by the electrospinning method. The X-ray diffraction (XRD) pattern showed that La doping does not change the crystal structure up to the doping ratio of La/Ni=1.5%. Electrochemical properties of La-doped NiO nanofibers were investigated using cyclic voltammetry and galvanostatic charge/discharge. The results showed that the La doping can enhance the charge/discharge specific capacitance and electrochemical stability of the NiO nanofibers. Especially, the sample with doping ratio of La/Ni=1.5% could reach a discharge specific capacitance of 94.85 F g−1 at a constant current density of 5 mA cm−2.