Constructing ultra-thin Ni-MOF@NiS2 nanosheets arrays derived from metal organic frameworks for advanced all-solid-state asymmetric supercapacitor. (May 2021)

• Record Type: Journal Article
• Authors: Zhang, Jiawei; Li, Yu; Han, Manshu; Xia, Qianshan; Chen, Qingguo; Chen, Minghua
• Is Part Of: Materials research bulletin. Volume 137(2021)
• Publication Date: 2021-05
• Subjects: Supercapacitor -- Metal organic frameworks -- Heterostructure -- Nickel sulfides; Materials -- Periodicals; Crystal growth -- Periodicals; Matériaux -- Périodiques; Cristaux -- Croissance -- Périodiques; Crystal growth; Materials; Periodicals; 620.11
• DOI: 10.1016/j.materresbull.2020.111186
• Languages: English
• ISSNs: 0025-5408

Abstract

Graphical abstract: Ni-MOF@NiS2 ultra-thin nanosheets arrays have been prepared through a facile two-step method, which was directly used as a free-standing electrode, deliver a remarkable specific capacity. The all-solid-state asymmetric supercapacitor shows a superior energy density of 23.5 Wh kg −1 at a power density of 1.4 kW kg −1 and good cycling stability of 95.2 % after 10000 cycles. Highlights: The hierarchical Ni-MOF@NiS2 ultra-thin nanosheets arrays were prepared. The Ni-MOF@NiS2 revealed excellent performance in all-solid-state supercapacitors. The superior properties generated from the synergistic effect between Ni-MOF and NiS2 . Abstract: Metal-organic frameworks (MOFs) consisted of metal ions and organic linker have been successful applied to energy storage device as promising electrode materials candidates for energy storage. However, pristine MOFs have been limited application due to poor electrical conductivity and stability. Here, we design ultra-thin Ni-MOF@NiS2 nanosheet arrays derived from Ni-MOF as self-sacrificed template and precursor. Particularly, this unique heterostructure not only enhances the conductivity but also holds the porous Ni-MOF structure. The as-prepared Ni-MOF@NiS2 electrode delivers a superior specific capacity and rate performance compared with the Ni-MOF electrode. The asymmetric supercapacitor (ASC) consisting of Ni-MOF@NiS2 and active carbon shows good cycling stability and high power density and energy density. This work may provide an innovative strategy for the rational preparation of MOF arrays electrode.