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Germanium is a promising anode for lithium ion batteries (LIB) because of its potential rate capability and high theoretical specific capacity. Here we demonstrate a seamlessly connected graphene and carbon nanotube (GCNT) hybrid that serves as an integral current collector for a Ge anode. A vertically aligned CNT (VA-CNT) forest grown on graphene provides a high surface area for Ge deposition. The...
A facile and cost-effective approach to electrodes made from nitrogen-doped carbonized cotton is disclosed. These are further used in flexible supercapacitors. The resulting supercapacitors have a specific capacitance of 207 F/g at 1.0 A/g, high energy density of 7.2 Wh/kg at 1.0 A/g, and power density of 3823 W/kg at 14 A/g. The composite also demonstrates excellent long-term cycling stability with...
We present the capability of large-area graphene coating via superhydrophilic-assisted electro-hydrodynamic spraying deposition (SH-ESD) technology. In this paper, we detail the effect of hydrophilicity on depositing graphene sheets with electro-hydrodynamic spraying. The mechanism of graphene deposition is shown mathematically and experimentally. The resulting graphene coatings were characterized...
The objective of this research was to develop activated carbon selection criteria that assure the effective removal of trace organic contaminants from aqueous solution and to base the selection criteria on physical and chemical adsorbent characteristics. To systematically evaluate pore structure and surface chemistry effects, a matrix of activated carbon fibers (ACFs) with three activation levels...
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