Abstract
Metal organic frameworks (MOFs) have been considered as one of the most promising electrode materials for electrochemical capacitors due to their large specific surface area and abundant pore structure. Herein, we report a Co-MOF electrode with a vertical-standing 2D parallelogram-like nanoarray structure on a Ni foam substrate via a one-step solvothermal method. The as-prepared Co-MOF on a Ni foam electrode delivered a high area-specific capacitance of 582.0 mC cm−2 at a current density of 2 mA cm−2 and a good performance rate of 350.0 mC cm−2 at 50 mA cm−2. Moreover, an asymmetric electrochemical capacitor (AEC) device (Co-MOF on Ni foam//AC) was assembled by using the as-prepared Co-MOF on a Ni foam as the cathode and a active carbon-coated Ni foam as the anode to achieve a maximum energy density of 0.082 mW cm−2 at a power density of 0.8 mW cm−2, which still maintained 0.065 mW cm−2 at a high power density of 11.94 mW cm−2. Meanwhile, our assembled device exhibited an excellent cycling stability with a capacitance retention of nearly 100% after 1000 cycles. Therefore, this work provides a simple method to prepare MOF-based material for the application of energy storage and conversion.
Highlights
Nowadays, in order to fight climate change and promote green, low-carbon development, developing renewable energy sources, such as wind energy, solar energy, geothermal energy, tidal energy, has been considered as one of the most promising and effective ways to decrease the greenhouse gas emission [1,2,3]
It is very urgent to explore a reliable electrochemical energy storage device to efficiently store these renewable energy sources. Among these electrochemical energy storage devices, electrochemical capacitors have drawn remarkable attention owing to their high power density and long cycling stability along with fast energy storage ability [4,5,6,7]
Metal organic frameworks (MOFs) arrays on the conductive substrate, we developed a Co-MOF electrode with verticalstanding 2D parallelogram-like nanoarray structure on a Ni foam substrate via a one-step solvothermal method
Summary
In order to fight climate change and promote green, low-carbon development, developing renewable energy sources, such as wind energy, solar energy, geothermal energy, tidal energy, has been considered as one of the most promising and effective ways to decrease the greenhouse gas emission [1,2,3]. It is very urgent to explore a reliable electrochemical energy storage device to efficiently store these renewable energy sources Among these electrochemical energy storage devices, electrochemical capacitors have drawn remarkable attention owing to their high power density and long cycling stability along with fast energy storage ability [4,5,6,7]. It is of great importance to improve the energy density of the electrochemical capacitors accompanied with the high power density and long cycling stability
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