Controllable metal–organic framework-derived Nico-layered double hydroxide nanosheets on vertical Graphene as mott–schottky heterostructure for highperformance hybrid supercapacitor

Mingliang He and Jia Qiao and Binghua Zhou and Jie Wang and Shien Guo and Gan Jet Hong Melvin and Mingxi Wang and Hironori Ogata and Yoong Ahm Kim and Masaki Tanemura and Shuwen Wang and Mauricio Terrones, and Morinobu Endo and Fei Zhang and Zhipeng Wang (2024) Controllable metal–organic framework-derived Nico-layered double hydroxide nanosheets on vertical Graphene as mott–schottky heterostructure for highperformance hybrid supercapacitor. Small Structures, 5 (10). pp. 1-12.

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URL: https://www.researchgate.net/publication/383220370...

Abstract

Layered double hydroxide (LDH) is considered a highly promising electrode material for supercapacitors (SCs) due to its high theoretical specific capacitance. However, LDH powders often suffer from poor electrical conductivity, structure pulverization, slow charge transport, and insufficient active sites. Herein, a selfsupporting electrode with a Mott–Schottky heterostructure has been designed for high-performance SCs. The electrode consists of low crystallinity NiCo-LDH nanosheets and vertical graphene (VG) directly grown on carbon cloth. The LDH was converted from a metal–organic framework (MOF) by the sol–gel method. This self-supporting electrode provides fast charge transfer, reducing the pulverization effect and energy barrier. The Mott–Schottky heterostructure of LDH@VG regulates electron density and enhances electron transfer, as confirmed by density functional theory calculation. The optimized LDH@VG heterostructure electrode exhibits an excellent areal capacitance of 5513.8 mF cm 2 and rate capability of 82.1%. Furthermore, the fabricated hybrid SC demonstrates excellent energy density of 404.8 μWh cm 2 at 1.6 mW cm 2 and a remarkable cycling life, with a capacitance of 92.0% after 10 000 cycles. This work not only provides a simple dip-coating and MOF conversion method to synthesize heterojunction-based electrodes, but also broadens the horizon for designing advanced electrode materials for SCs.

Item Type:	Article
Keyword:	hybrid supercapacitors, low crystallinity NiCo-layered double hydroxide nanosheets, Mott–Schottky heterostructures, self-supporting electrode, vertical graphene
Subjects:	T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK1-9971 Electrical engineering. Electronics. Nuclear engineering T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK1-9971 Electrical engineering. Electronics. Nuclear engineering > TK7800-8360 Electronics
Department:	FACULTY > Faculty of Engineering
Depositing User:	ABDULLAH BIN SABUDIN -
Date Deposited:	19 Nov 2024 15:50
Last Modified:	19 Nov 2024 15:50
URI:	https://eprints.ums.edu.my/id/eprint/41950

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