期刊
APPLIED SURFACE SCIENCE
卷 592, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.apsusc.2022.153268
关键词
Graphene nanoflakes; Silicon-doped carbon; Template pyrolysis; Lithium-ion batteries
类别
资金
- Russian Science Foundation [18-13-00217]
- Lomonosov Moscow State University Program of Development
- Russian Science Foundation [18-13-00217] Funding Source: Russian Science Foundation
The study developed a tunable approach for the synthesis of Si-doped jellyfish-like graphene nanoflakes. The doping of GNFs with Si significantly boosted the specific capacity of the lithium-ion battery electrode, and synthesis conditions strongly affected the electrode performance.
Incorporation of heteroatoms into graphene layers is a powerful way of tuning their surface and structure. We developed for the first time a tunable approach for the synthesis of Si-doped jellyfish-like graphene nanoflakes (Si-GNFs) via template pyrolysis. The synthesis parameters were shown to affect the doping level, silicon bonding type, heteroatom localization in Si-GNFs, and the defectiveness of the synthesized material. The silicon incorporation into GNF layers creates acidic and basic Lewis sites as it was tested in the butanol-2 conversion over SiGNF. Doping of GNFs with Si significantly boosted the specific capacity of GNF-based electrode of the lithium-ion battery up to 600 mAh*g(- 1). The capacity enhancement was ascribed to the redistribution of the electron density due to the difference in electronegativity between C and Si, corrugation of the graphene layers by heteroatoms, and reduction of silicon species. The synthesis conditions were shown to strongly affect the capacity and cycle stability of the electrode.
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