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Controllable Preparation of 3D Graphene with Different Morphologies for High-Performance Electrode Materials
Yanyun Liu1, Ling Ma1, Yongqiang Chen1
1College of Chemistry and Chemical Engineering, Jinzhong University, Jinzhong 030619, P. R. China.
ACS Omega
|November 23, 2020
Summary
Vertically aligned graphene (VAGN) synthesized via controlled freeze-drying exhibits superior electrochemical performance for supercapacitors compared to graphene foam (GF). VAGN offers higher capacitance and energy density due to its aligned structure, enhancing ion and electron transport.
Area of Science:
- Materials Science
- Nanotechnology
- Electrochemistry
Background:
- Three-dimensional (3D) graphene synthesis is crucial for advanced energy storage applications.
- Controlling graphene morphology impacts its electrochemical properties.
Purpose of the Study:
- To synthesize 3D graphene with controlled morphologies using freeze-drying.
- To investigate the electrochemical performance of different 3D graphene structures for supercapacitors.
Main Methods:
- Controlled freeze-drying of graphene to achieve distinct morphologies: vertically aligned graphene (VAGN) and graphene foam (GF).
- Characterization of nanostructure morphology and electrochemical performance testing of supercapacitors.
Main Results:
- VAGN exhibits a uniform, dense, and porous network, while GF has a cross-linked porous framework.
- VAGN-based supercapacitors show higher specific capacitance (182 F g⁻¹ at 0.5 A g⁻¹) than GF (160 F g⁻¹ at 0.5 A g⁻¹).
- VAGN supercapacitors demonstrate superior energy density (7.05 Wh kg⁻¹) and stability (95.7% capacitance retention after 2000 cycles) compared to GF.
Conclusions:
- Controlled freeze-drying is an effective method for tailoring 3D graphene morphology.
- The aligned structure of VAGN enhances electrochemical performance by reducing internal resistance and improving charge transport.
- 3D graphene with controlled morphologies shows significant potential as electrode materials for high-performance supercapacitors.
