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Synthesis and Functionalization of 3D Nano-graphene Materials: Graphene Aerogels and Graphene Macro Assemblies
Published on: November 5, 2015
3D MnO2-graphene composites with large areal capacitance for high-performance asymmetric supercapacitors
Teng Zhai1, Fuxin Wang, Minghao Yu
1KLGHEI of Environment and Energy Chemistry, MOE of the Key Laboratory of Bioinorganic and Synthetic Chemistry, School of Chemistry and Chemical Engineering, Sun Yat-Sen University, 135 Xingang West Road, Chemical North Building 325, Guangzhou 510275, People's Republic of China.
Researchers developed a simple method to create high-performance supercapacitors (SCs) using manganese dioxide on graphene gel/nickel foam. This material achieves high areal capacitance and energy density, showing great potential for advanced energy storage devices.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Supercapacitors (SCs) are crucial for energy storage.
- Developing electrodes with high mass loading is key for enhanced performance.
- Porous graphene gel/nickel foam offers a promising scaffold for electrode materials.
Purpose of the Study:
- To develop an effective and simple strategy for preparing high areal mass loading of manganese dioxide (MnO2) on porous graphene gel/nickel foam (G-gel/NF).
- To evaluate the electrochemical performance of the prepared MnO2/G-gel/NF material for supercapacitor applications.
- To fabricate and assess an asymmetric supercapacitor (ASC) device utilizing the novel electrode material.
Main Methods:
- Synthesized MnO2 on porous graphene gel/Ni foam (MnO2/G-gel/NF) using a straightforward strategy.
- Characterized the material's structure and electrochemical properties, including areal capacitance and rate capability.
- Assembled an asymmetric supercapacitor (ASC) using MnO2/G-gel/NF as the positive electrode and G-gel/NF as the negative electrode.
Main Results:
- Achieved a high areal mass loading of MnO2/G-gel/NF (13.6 mg cm(-2)) with a large areal capacitance of 3.18 F cm(-2) (234.2 F g(-1)) and good rate capability.
- The enhanced properties are attributed to improved conductivities and ion accessibility.
- The fabricated ASC demonstrated a remarkable energy density of 0.72 mW h cm(-3) and excellent cycling stability (<1.5% decay after 10,000 cycles).
Conclusions:
- The developed strategy enables the preparation of SC electrodes with high mass loading.
- The MnO2/G-gel/NF material exhibits excellent electrochemical performance, suitable for high-performance supercapacitors.
- This work opens new avenues for designing SCs with high areal capacitance and energy density.
