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- Title
Sandwich-Type Microporous Carbon Nanosheets for Enhanced Supercapacitor Performance.
- Authors
Hao, Guang‐Ping; Lu, An‐Hui; Dong, Wei; Jin, Zhen‐Yu; Zhang, Xiang‐Qian; Zhang, Jin‐Tao; Li, Wen‐Cui
- Abstract
Sandwich-type microporous hybrid carbon nanosheets (MHCN) consisting of graphene and microporous carbon layers are fabricated using graphene oxides as shape-directing agent and the in-situ formed poly(benzoxazine- co-resol) as carbon precursor. The reaction and condensation can be readily completed within 45 min. The obtained MHCN has a high density of accessible micropores that reside in the porous carbon with controlled thickness (e.g., 17 nm), a high surface area of 1293 m2 g−1 and a narrow pore size distribution of ca. 0.8 nm. These features allow an easy access, a rapid diffusion and a high loading of charged ions, which outperform the diffusion rate in bulk carbon and are highly efficient for an increased double-layer capacitance. Meanwhile, the uniform graphene percolating in the interconnected MHCN forms the bulk conductive networks and their electrical conductivity can be up to 120 S m−1 at the graphene percolation threshold of 2.0 wt.%. The best-practice two-electrode test demonstrates that the MHCN show a gravimetric capacitance of high up to 103 F g−1 and a good energy density of ca. 22.4 Wh kg−1 at a high current density of 5 A g−1. These advanced properties ensure the MHCN a great promise as an electrode material for supercapacitors.
- Subjects
NANOSTRUCTURES; CARBON analysis; GRAPHENE oxide; PERCOLATION; SUPERCAPACITOR performance
- Publication
Advanced Energy Materials, 2013, Vol 3, Issue 11, p1421
- ISSN
1614-6832
- Publication type
Article
- DOI
10.1002/aenm.201300383