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Highly ordered mesoporous few-layer graphene frameworks enabled by fe3 o4 nanocrystal superlattices
Yucong Jiao1, Dandan Han, Limin Liu
1Collaborative Innovation Center of Chemistry for Energy Materials, Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, and Department of Chemistry, Fudan University, Shanghai 200433 (China).
Angewandte Chemie (International Ed. in English)
|April 1, 2015
Summary
Researchers developed ordered mesoporous graphene frameworks (MGFs) using iron oxide nanocrystals. These MGFs show promise as durable anode materials for high-performance lithium-ion batteries.
Area of Science:
- Materials Science
- Nanotechnology
- Electrochemistry
Background:
- Synthesizing ordered mesoporous carbons with high graphitic content and surface area remains challenging.
- Existing methods often struggle to achieve both ordered porosity and graphitic structure simultaneously.
Purpose of the Study:
- To develop a straightforward method for creating highly ordered mesoporous graphene frameworks (MGFs).
- To investigate the potential of these MGFs as advanced anode materials for lithium-ion batteries.
Main Methods:
- Fabrication of MGFs via conversion of self-assembled superlattices of Fe3O4 nanocrystals.
- Characterization of MGF structure, including pore size, symmetry, and wall thickness.
- Evaluation of MGFs as anode materials in lithium-ion batteries, assessing cycling stability and rate performance.
Main Results:
- Successfully synthesized MGFs with face-centered-cubic symmetry and interconnected mesoporosity.
- Achieved ultrathin pore walls composed of three to six graphene layers.
- Demonstrated excellent cycling stability and rate performance, retaining 520 mAh/g at 300 mA/g after 400 cycles.
Conclusions:
- The proposed method offers a viable route to highly ordered mesoporous graphene frameworks.
- The unique architecture and structural integrity of MGFs make them promising candidates for high-performance lithium-ion battery anodes.
