XG Sciences and Oak Ridge National Laboratory launch joint-development program for advanced titanium/graphene composite materials

XG Sciences, Inc., a manufacturer of graphene nanoplatelets (earlier post), has launched a joint program with Oak Ridge National Laboratory (ORNL) to develop a titanium-graphene metal-matrix composite (MMC) using an advanced powder metallurgy manufacturing process. Metal matrix composites, comprising a metal and a reinforcement material to confer improved performance, have... Read more →

Left: CoO shell is shown in green, Co core in black. Right: Nanoparticles of cobalt attach themselves to a graphene substrate in a single layer. Credit: Sun Lab/Brown University. Click to enlarge. Chemists at Brown University have engineered a cobalt/cobalt oxide/graphene catalyst for the oxygen reduction reaction in fuel cells... Read more →

Plot of current performance data in the lab for Si/graphene anodes. Source: XG Sciences. Click to enlarge. As part of the FY 2012 Phase I Release 3 SBIR/STTR Award program, the US Department of Energy (DOE) has awarded Michigan-based XG Sciences, a manufacturer of graphene nanoplatelets (earlier post), a contract... Read more →

The Ragone plots of graphene surface-enabled Li ion-exchanging cells with different electrode thicknesses. Credit: ACS, Jang et al. Click to enlarge. A team from Nanotek Instruments and Angstrom Materials reports on a new strategy for the design of high-power and high energy-density devices based on the massive exchange of lithium... Read more →

Cycling performance of graphene/Sn nanopillar nanostructure anodes at a constant current density of 0.05 A g-1. For comparison, the cycling performance of pure graphene and Sn films under the same conditions are also shown. Ji et al. Click to enlarge. Researchers with the US Department of Energy’s Lawrence Berkeley National... Read more →

Induced voltage as a function of fluid flow velocity for the graphene film (exposed to ~0.6 and ~0.3 M HCl solutions) and for a multiwalled carbon nanotube (MWNT) film exposed to a ~0.6 M HCl solution. Credit: ACS, Dhiman et al. Click to enlarge. Researchers at Rensselaer Polytechnic Institute (RPI)... Read more →

Mapping the electronic cloud of graphene. The red regions depict folds in the material while the green regions are relatively flat domains. The “hills and valleys” present in the electron cloud can act as speed bumps preventing the flow of charge through the material. Image credit: Brian Schultz and Christopher... Read more →

Ragone plots for the pristine graphene, N-doped graphene, B-doped graphene, graphene oxide (GO), and GO500 based cells with lithium metal as the counter/reference electrode. The calculation of gravimetric energy and power density was based on the active material mass of a single electrode. Credit: ACS, Wu et al. Click to... Read more →

Schematic of the synthesis steps for a graphene-sulfur composite material, with a proposed schematic structure of the composite. Credit: ACS, Wang et al. Click to enlarge. Researchers at Stanford University led by Drs. Yi Cui and Hongjie Dai report the synthesis of a graphene–wrapped sulfur composite material that shows high... Read more →

Variation in discharge capacity vs. cycle number for graphite, RGO, and Li-RGO cycled at a current rate of 25 mA/g between 3.0 and 0.02 V vs Li/Li+ in a 1 M solution of LiPF6 in a 1:1 (v/v) mixture of ethylene carbonate (EC) and dimethyl carbonate (DMC) as the electrolyte.... Read more →

Left: Rate capability of MoS2/G samples at different current densities:(1) MoS2/G (1:1); (2) MoS2/G (1:2); (3) MoS2/G (1:4). Right: cartoon of the composite. Credit: ACS, Chang and Chen. Click to enlarge. A pair of researchers from Zhejiang University (China) have synthesized layered MoS2/graphene (MoS2/G) composites using a facile biomolecular-assisted process... Read more →

(A) Schematic showing the microwave exfoliation/reduction of GO and the chemical activation of MEGO (a-MEGO) that creates pores while retaining high electrical conductivity. (B–E) Images of a-MEGO. E shows presence of a dense network of nanometer-scale pores surrounded by highly curved, predominantly single layer carbon. Credit: Zhu et al. Click... Read more →