Abstract
Metal-organic frameworks are compounds with a reticulated skeletal structure formed by chemically bonding inorganic and organic units that are widely used in many fields, such as photocatalysis, gas separation and energy storage, because of their unique structures. In this paper, we prepared a metal-organic framework [(μ2-2-methylimidazolyl)12-Zn(ii)6-H18O10]n(ZM) with well-developed pores and high specific surface area of MOFs by the solution method. And MOF-derived porous carbon was prepared by the direct charring method in an argon atmosphere using a mixture of ZM, ZM and potassium citrate as carbon precursors. Characterization analysis revealed that the maximum specific surface area of ZMPC-800-1:15 was 2014.97 m2⋅g−1, and the pore size structure was mainly mesoporous. At a current density of 1.0 A⋅g−1 the specific capacitance of ZMC-800 and ZMPC-800-1:15 was 121.3 F⋅g−1 and 226.6 F⋅g−1, respectively, with a substantial increase of 86.8%. The specific capacitance of ZMPC-800-1:15 decays to 168.8 F⋅g−1, with a decay rate of 25.5%, when the current density increases to 10.0 A⋅g−1. After 5000 constant current charge/ discharge cycles, the capacitance retention rate was still 96.41%. These results prove that the application of MOF-derived carbon materials in future supercapacitors is very promising.
Highlights
With the continuous development of supercapacitor electrode materials, composite materials, metal oxides, functional carbon materials and conducting polymers have been successfully applied to supercapacitors [1] [2]
After 5000 constant current charge/ discharge cycles, the capacitance retention rate was still 96.41%. These results prove that the application of Metal-Organic Framework (MOF)-derived carbon materials in future supercapacitors is very promising
MOF materials are crystalline framework structures synthesized by assembling metal clusters/ion-organic ligands that have the advantages of high porosity and a large specific surface area, but the stability of their frameworks is generally poor, and the framework structure is prone to collapse during high-temperature carbonization, resulting in the degradation of the specific surface and porosity as well as the electrochemical properties of the derived porous carbon, which affects the application of carbon materials derived from MOFs in supercapacitors [7]
Summary
With the continuous development of supercapacitor electrode materials, composite materials, metal oxides, functional carbon materials and conducting polymers have been successfully applied to supercapacitors [1] [2]. S. et al [12] prepared multilayer porous carbon by calcining Metal-Organic Framework (MOF)/Chitosan (CS) composites and discussed the effect of chitosan additives on the pore-forming structure. At a current density of 0.05 A∙g−1, NPC-2 has a high specific capacitance of 199.9 F∙g−1 and good multiplicative performance in an electrolyte of 1 M H2SO4. At a current density of 2 A∙g−1, the capacitance loss of NPC-2 was 21% after 10,000 cycles, showing excellent cycling stability of MOF-derived composite porous carbon NPC-2. A metal-organic framework material [(μ2-2-methylimidazolyl)12-Zn(ii)6-H18O10]n was synthesized by the solution method to prepare porous carbon derived from a high specific surface area and high porosity by direct carbonization of MOFs and carbonization of MOFs and a potassium citrate mixture, respectively.
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