Heterogeneous Mn-Ni(OH)2/NiO@C hierarchical porous nanosheets for high energy density hybrid supercapacitors

Multicomponent heterogeneous nanomaterials generally have the potential to exhibit excellent electro-chemical performance. Herein, Mn-doped Ni(OH)2, NiO and C heterogeneous composites are designed and synthesized by using metal-organic frameworks (MOFs) as self-sacrificial templates. The synergistic effect brought by the multicomponent heterogeneous composition effectively improves the charge storage ca-pacity, the two-dimensional nanosheet structure provides a large specific surface area, and the graphitic carbon enhances the electrical conductivity. The Mn-Ni(OH)2/NiO@C composite as an electrode material exhibits a specific capacity of 732.1 C g-1 at 1 A g-1. Furthermore, the assembled Mn-Ni(OH)2/NiO@C//AC HSC device can output 38.0 Wh kg-1 at a power density of 849.2 W Kg-1, with 82.9% retention after 5000 cycles. This study provides a novel strategy for MOFs as templates to obtain multicomponent energy storage materials. (c) 2022 Elsevier B.V. All rights reserved.