| METALS AND METAL MATRIX COMPOSITES |
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| Fabrication and Electrochemical Properties of Novel Spherical Ni/Co-MOFs as Electrode Materials |
| NIU Xiaoqin1,†, KANG Xiaoya2,†, MA Yingxia2, WANG Jiawei2, CHEN Xinquan2, TIAN Hu2, CHEN Yuhong1, RAN Fen2
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1 School of Petrochemical Engineering, Lanzhou University of Technology, Lanzhou 730050, China
2 State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals, School of Materials Science & Engineering, Lanzhou University of Technology, Lanzhou 730050, China |
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Abstract Metal-organic frameworks (MOFs) materials have aroused tremendous attention and been used as electrochemically active materials. In this work, a new electrode material of nickel/cobalt metal-organic frameworks (Ni/Co-MOFs) was fabricated by a facile one-pot solvothermal reaction using 1, 3, 5-benzenetricarboxylic acid (H3BTC) as the organic ligand, and nickel chloride hexahydrate (NiCl2·6H2O) and cobalt nitrate hexahydrate (Co(NO3)2·6H2O) as the central of metal ions. The microscopic morphology and structural composition of the Ni/Co-MOFs sample were characterized by SEM, XRD, XPS and BET, and the electrochemical performances were tested by cyclic voltammetry, galvanosta-tic charging-discharging and electrochemical impedance spectra methods. The results indicate that the novel spherical Ni/Co-MOFs is successfully fabricated. The prepared Ni/Co-MOFs exhibits the specific capacitance of 779 F/g at the current density of 0.5 A/g in 6 mol/L KOH electrolyte, and the capacitance retention remains 79% after the current density increases to 5 A/g. Furthermore, the asymmetric supercapacitor of Ni/Co-MOFs‖AC assembled using Ni/Co-MOFs as the positive electrode and activated carbon as the negative electrode possesses the specific capacitance of 107 F/g at the current density of 0.5 A/g. The asymmetric supercapacitors device delivers a satisfied energy storage capacity with the energy density of 38 Wh/kg at the power density of 400 W/kg, and the desired cycling stability of 65.71% after 10 000 cycles sequential charging-discharging. As such, it is believed that the prepared Ni/Co-MOFs have potential applications as electrode materials in the energy storage devices.
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Published:
Online: 2022-07-26
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| Fund:Joint Fund Between Shenyang National Laboratory for Materials Science and State Key Laboratory of Advanced Proces-sing and Recycling of Nonferrous Metals (18LHPY005) and the National Natural Science Foundation of China (51763014, 52073133). |
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2022, Vol. 36 
