Synthesis of Two-Dimensional Sr-Doped LaNiO(3) Nanosheets with Improved Electrochemical Performance for Energy Storage

Designing a novel, efficient, and cost-effective nanostructure with the advantage of robust morphology and outstanding conductivity is highly promising for the electrode materials of high-performance electrochemical storage device. In this paper, a series of honeycombed perovskite-type Sr-doped LaNiO(3) nanosheets with abundant porous structure were successfully synthesized by accurately controlling the Sr-doped content. The study showed that the optimal LSNO-0.4 (La(0.6)Sr(0.4)NiO(3-δ)) electrode exhibited excellent electrochemical performance, which showed a high capacity of 115.88 mAh g(−1) at 0.6 A g(−1). Furthermore, a hybrid supercapacitor device (LSNO//AC) based on LSNO-0.4 composites and activated carbon (AC) showed a high energy density of 17.94 W h kg(−1), a high power density of 1600 W kg(−1), and an outstanding long-term stability with 104.4% capacity retention after 16,000 cycles, showing an excellent electrochemical performance and a promising application as an electrode for energy storage.