Sepiolite/amorphous nickel hydroxide hierarchical structure for high capacitive supercapacitor

Sepiolite/amorphous nickel hydroxide (SEP/Ni(OH)(2)) hierarchical structures consist of sepiolite (SEP) fibers and amorphous Ni(OH)(2) nanosheets have been synthesized successfully via a facile, scalable co-reduction method as excellent performance supercapacitor. SEP fibers are provided as a matrix for the attachment and diffusion of Ni(OH)(2) nanosheets. The effects of the combination of SEP and Ni(OH)(2) on the morphology, structure, and electrochemical performance of SEP/Ni(OH)(2) are discussed comprehensively. When the molar ratio of SEP and Ni(OH)(2) is 1:8, the specific capacitance of SEP/Ni(OH)(2) reaches 2050 F g(-1) at the current density of 1 A g(-1), which is approximately 53 times larger than that of the pure SEP. Moreover, the SEP/Ni(OH)(2)-8//AC (active carbon) asymmetric supercapacitor represent a prominent energy density of 24 Wh kg(-1) at a power density of 950 W kg(-1). A red LED (1.8-2 V) and a yellow LED (1.9-2.4 V) can be lighted easily. The enhanced electrochemical performance of SEP/Ni(OH)(2) is ascribed to its high surface area and high charge transfer rate for amorphous porous structure. (C) 2021 Elsevier B.V. All rights reserved.

Automated summary

Hierarchical structures of SEP/Ni(OH)(2) have been successfully synthesized as high performance supercapacitors, with a specific capacitance reaching 2050 F g(-1) and an energy density of 24 Wh kg(-1) when the molar ratio of SEP and Ni(OH)(2) is 1:8.