title: Two-dimensional mesoporous carbon nanosheets and their derived graphene nanosheets: synthesis and efficient lithium ion storage.
abstract: We report a new solution deposition method to synthesize an unprecedented type of two-dimensional ordered mesoporous carbon nanosheets via a controlled low-concentration monomicelle close-packing assembly approach. These obtained carbon nanosheets possess only one layer of ordered mesopores on the surface of a substrate, typically the inner walls of anodic aluminum oxide pore channels, and can be further converted into mesoporous graphene nanosheets by carbonization. The atomically flat graphene layers with mesopores provide high surface area for lithium ion adsorption and intercalation, while the ordered mesopores perpendicular to the graphene layer enable efficient ion transport as well as volume expansion flexibility, thus representing a unique orthogonal architecture for excellent lithium ion storage capacity and cycling performance. Lithium ion battery anodes made of the mesoporous graphene nanosheets have exhibited an excellent reversible capacity of 1040 mAh/g at 100 mA/g, and they can retain at 833 mAh/g even after numerous cycles at varied current densities. Even at a large current density of 5 A/g, the reversible capacity is retained around 255 mAh/g, larger than for most other porous carbon-based anodes previously reported, suggesting a remarkably promising candidate for energy storage.
authors.affiliation: Laboratory of Advanced Materials, Department of Chemistry and Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Fudan University, Shanghai 200433, PR China.
authors.forename: Yin
authors.initials: Y
authors.lastname: Fang
authors.forename: Yingying
authors.initials: Y
authors.lastname: Lv
authors.forename: Renchao
authors.initials: R
authors.lastname: Che
authors.forename: Haoyu
authors.initials: H
authors.lastname: Wu
authors.forename: Xuehua
authors.initials: X
authors.lastname: Zhang
authors.forename: Dong
authors.initials: D
authors.lastname: Gu
authors.forename: Gengfeng
authors.initials: G
authors.lastname: Zheng
authors.forename: Dongyuan
authors.initials: D
authors.lastname: Zhao
mesh_terms: D011211:Electric Power Supplies; D006108:Graphite / Q000737:chemistry*; D007477:Ions / Q000737:chemistry; D008094:Lithium / Q000737:chemistry*; D037742:Nanotubes, Carbon / Q000737:chemistry*; D010316:Particle Size; D016062:Porosity; D013499:Surface Properties
chemical_list: D007477:Ions; D037742:Nanotubes, Carbon; D006108:Graphite; D008094:Lithium