Facile pyrolysis approach of folic acid-derived high graphite N-doped porous carbon materials for the oxygen reduction reaction

One-step pyrolysis process to design hierarchical micro/mesoporous m-NC materials with high graphite N dopant as excellent ORR electrocatalytic.

Preparation of Siliconized Graphite by Liquid Silicon Infiltration of Porous Carbon Materials

Siliconized graphite was prepared by liquid silicon infiltration (LSI) of carbon preforms composed of mesocarbon microbeads (MCMBs), petroleum coke and graphite powder as the carbon source with binder of phenolic resin. Effects of the carbon source, binder contents, ball-milling time and moulding pressure on the properties of the porous carbon preforms and the siliconized graphite were investigated. The results showed that the moulding pressure was the main factor influencing the open porosity of the carbon preforms. The carbon preforms with porosity of above 45% could be infiltrated completely with Si, and maximum open porosity of 56% could be reached for the carbon preforms. For the siliconized graphite, high MCMBs contents contributed to high density, while high graphite content led to increased carbon remaining. The densities, open porosities, and the highest bending strength of the siliconized graphite were ranged between 2.90-3.01g·cm-3, less than 1.5%, and 317 MPa, respectively.

High graphite N content in nitrogen-doped graphene as an efficient metal-free catalyst for reduction of nitroarenes in water

High graphite N content in nitrogen-doped graphene is synthesized by a one-step hydrothermal reaction, which can catalyze the reduction of nitroarenes by using a small amount of NaBH4 in water with high yield.

Effect of Graphite on the Friction and Wear Properties of Cu-Based Friction Materials

Cu-based friction materials were prepared by powder metallurgy technology. The effect of the graphite on friction and wear properties of materials was investigated. The experimental results indicate that the wear rate of the materials increased with increasing speed. The wear rate of the materials with the graphite with the size of 300~600μm decreased with increasing graphite content, indicating that the graphite size of 300~600μm showed the good lubricating effect. The lubricating film made the friction coefficient decrease. The wear resistance of materials with 100~300μm graphite was degraded at high graphite content, and the graphite size of 100~300μm has bad effect on the strength of materials. The wear debris made the friction coefficient slightly increase with the increase of graphite content. The material with the graphite content of 10% and the graphite size of 300~600μm has the best friction and wear properties.

Seebeck Effect in Graphite-Carbon Fiber Cement Based Composite

The Seebeck effect in carbon fiber reinforced cement-based composite (CFRC) is of interest because it enables the cement-based materials to sense its own temperature without attached or embedded sensor. In this study, the Seebeck coefficient of CFRC and graphite-carbon fiber cement based composite were measured. Results show that the addition of graphite can enhance the Seebeck effect of CFRC. When graphite content is 10wt. %, all types of CFRC show P-type because the hole contribution from carbon fiber dominates the Seebeck effect. When the graphite content is 20wt. %, the change of thermoelectric power (TEP) from positive to negative occurs with the increasing of graphite to carbon fiber ratio (≥25). This phenomenon indicates that compensation takes place between electron contribution from graphite and hole contribution from carbon fiber. At a high graphite content (30wt. %), CFRC shows N-type above a certain temperature difference (20-25°C) since the electrons from graphite dominate the Seebeck effect.