Effects of strontium substitution for La on the electrochemical performance of LaAlO3 perovskite nanotubes

In this study, a series of La 1−x Sr x AlO 3 (x = 0.0, 0.1, 0.15, and 0.2) nanotubes were prepared by electrospinning method, and their morphological and electrochemical properties were characterized. The results show that the La 1−x Sr x AlO 3 (x = 0.0, 0.1, 0.15, and 0.2) nanotubes exhibit a distinct hollow structure, the average diameters of the nanofibers are ∼75 nm, 70 nm, 95 nm, and 142 nm. The electrochemical results show that the La 1−x Sr x AlO 3 nanotubes have excellent electrochemical performance, and the maximum specific capacitance of 180 F/g for the La 0.9 Sr 0.1 AlO 3 . After 1500 charge–discharge cycles, the specific capacitance of the La 0.9 Sr 0.1 AlO 3 electrode retained ∼99%, indicating that it has good cycling stability and long service life. This provides a promising electrode material for supercapacitors.