期刊
JOURNAL OF COLLOID AND INTERFACE SCIENCE
卷 593, 期 -, 页码 32-40出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2021.02.101
关键词
Metal-organic frameworks; Supercapacitors; Two-dimensional; Energy storage; Nanoplate arrays
资金
- Programs for Science and Technology Development of Henan province [192102210019, 192102210025]
- Training Program of National Natural Science Foundation of Huanghuai University [110718521002]
- Funding for scientific research start-up of Huanghuai University [12011852]
In this study, Co-MOF materials with different 2D morphologies were successfully fabricated, showing excellent electrochemical properties, especially the vertical nanoplate arrays. Additionally, a hybrid supercapacitor assembled using this material exhibited outstanding performance in energy density and cyclic stability.
Construction of two-dimensional (2D) metal-organic frameworks (MOFs) for energy storage and conversion has attracted great attention due to the synergistic advantages of 2D nanostructures and MOFs. Herein, a Co-MOF material with different 2D morphologies of vertical nanoplate arrays and faveolate nanosheets are in-situ fabricated on Ni foam with and without using polyvinylpyrrolidone (PVP) as a regulator. Toward the application in energy storage, both of two morphologies of the Co-MOF exhibit good electrochemical properties. In particular, the vertical Co-MOF nanoplate arrays deliver a high areal capacity of 8.56 C/cm(2) at the current density of 5 mA/cm(2), which is much higher than that of faveolate Co-MOF nanosheets (2.39 C/cm(2) at 5 mA/cm(2)). Moreover, a hybrid supercapacitor (HSC) device using the Co-MOF nanoplate arrays positive electrode and activated carbon (AC) negative electrode is assembled, which delivers a volumetric capacitance of 17.9 F/cm(3) at 10 mA/cm(2), a high energy density of 7.2 mW h cm(-3) and a good cyclic stability (retaining over 88.0% of initial capacitance after 3000 cycles). These findings demonstrate that the as-fabricated 2D Co-MOFs possess a huge potential in energy storage. (C) 2021 Elsevier Inc. All rights reserved.
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