Direct chemical synthesis of interlaced NiMn-LDH nanosheets on LSTN perovskite decorated Ni foam for high-performance supercapacitors

Abstract Herein, we report a 3D hierarchical heterostructure LSTN@NiMn-layered double hydroxide (La0.4Sr0.4Ti0.9Ni0.1O3-δ@NiMn-LDH) as a novel electrode material for supercapacitors with outstanding performance. Designing the heterostructure with the wet chemical approach followed by the hydrothermal reaction to grow LDH layers has engineered LSTN@NiMn-LDH, a highly active towards the electrochemical performance. The formation of hybrid structure is characterized using X-ray diffraction, and scanning electron microscopy, which confirmed as well as showed the uniform growth of NiMn-LDH layers on LSTN nanoparticles. The electrochemical performance was studied by cyclic voltammetry and galvanostatic charge-discharge, representing the outstanding performance of the electrode materials. The capacity of LSTN@NiMn-LDH was found to be 485 mAh/g (1745 C/g) at 1 A/g, with 86% capacitive retention after 10,000 cycles at 2 A/g. The improved electrochemical performance of the LSTN@NiMn-LDH electrode could be ascribed to rapid diffusion pathways provided by LSTN and improved redox reactions of NiMn-LDH nanosheets owing to the high surface area.