Research and Reports on Metals

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Short Communication, Res Rep Metals Vol: 5 Issue: 2

Metal-organic framework/CNT based self-standing electrodes for asymmetric supercapacitor

Elif Vargun
Centre of Polymer Systems, Tomas Bata University in Zlín, T??. T. Bati 5678, 760 01, Zlín, Czech Republic

Abstract

Statement of the Problem: Metal-organic frameworks (MOFs) have been used as electrode materials in energy storage devices due to the high specific surface area and various functionality [1]. Even though MOFs can offer high surface area, they usually exhibit low conductivity. The composite structures of MOFs with graphene and CNTs have been developed to improve the electrochemical storage capacity in batteries and supercapacitors [2,3]. In this work, the sandwich-like Mn-MOF/CNT and Co-MOF/CNT composite electrodes have been developed for asymmetric supercapacitor. Polyaniline coated CNT ([email protected]) and carboxylated CNT (c-CNT) were used for the fabrication of free-standing sandwich-like MOF/CNT composite paper. To achieve optimum porosity, the carbonization of the MOF/CNT composite materials was performed. The effect of carbonization process on energy storage performances of two different MOF/CNT based electrode materials were evaluated.

Keywords:

Introduction:
Statement of the Problem: Metal-organic frameworks (MOFs) have been used as electrode materials in energy storage devices due to the high specific surface area and various functionality [1]. Even though MOFs can offer high surface area, they usually exhibit low conductivity. The composite structures of MOFs with graphene and CNTs have been developed to improve the electrochemical storage capacity in batteries and supercapacitors [2,3]. In this work, the sandwich-like Mn-MOF/CNT and Co-MOF/CNT composite electrodes have been developed for asymmetric supercapacitor. Polyaniline coated CNT ([email protected]) and carboxylated CNT (c-CNT) were used for the fabrication of free-standing sandwich-like MOF/CNT composite paper. To achieve optimum porosity, the carbonization of the MOF/ CNT composite materials was performed. The effect of carbonization process on energy storage performances of two different MOF/CNT based electrode materials were evaluated. Methodology & Theoretical Orientation: The solvothermal synthesis of Mn-MOF was done by dissolving MnCl2.4H2O (6 mmol) and2-hydroxyterephthalic acid (1.2 mmol) in DMF and then it was activated by removing the solvent under vacuum at 100ºC for 12 h. The same procedure was used for the synthesis of Co-MOF material by using CoCl2.6H2O (6 mmol). The sandwich like MOF/CNT based electrodes were fabricated by the formation of continuous layers of both modified CNT ([email protected], c-CNT) and MOF suspensions with vacuum assisted filtration. The characterization of electrode material was performed by XRD, SEM, TEM, Raman and XPS techniques. The supercapacitor performance of the free-standing sandwich-like MOF/ CNT composite based electrodes was compared by cyclic voltammetry (CV) and galvanostatic charge-discharge (GCD) techniques. The effect of carbonization of active materials on the improved electrochemical storage capacity was also evaluated

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