Preparation And Electrocatalytic Activity Of Graphitic Mesoporous Carbon

In recent years, graphitic carbons have attracted much attention by many scientists and engineers in practical and fundamental researches for use in hydrogen storage, fuel cells, catalysis and electrochemistry, due to their high electronic conductivity and mechanical strength.In this paper, graphitic mesoporous carbon (GMC) materials were successfully prepared using a facile, economical and environmentally-friendly method. The morphologies, structures and electrocatalytic properties of these materials were systematically investigated by high-resolution transmission electron microscope (HRTEM), X-ray diffraction (XRD) patterns, X-ray photo electronic spectroscopy and cyclic voltammograms.(1) GMC used as catalyst support for platinum loading was successfully prepared with non-toxic and economical sucrose as the carbon precursor and mesoporous iron oxide as a catalyst with a carbonization temperature of900℃Excellent dispersion of Pt nanoparticles loaded on the carbon support was achieved by a facile microwave assisted ethylene glycol method. Then, the activities of ethanol oxidation on Pt/GMC were investigated by cyclic voltammograms (CV) and Chronoamperometric curves. The results demonstrated that the Pt/GMC catalyst displayed better electrocatalytic activity and stability for ethanol oxidation than Pt/XC-72and Pt/CMK-3.(2) The mesoporous graphitic carbon (GMC) with huge specific surface area was synthesized using Ni-Fe layered double hydroxide (LDH) as both catalyst and template under a relatively low pyrolysis temperature. According to the research, the GMC/GC electrode showed well-defined oxidation peaks with lower anodic overpotential and the significant increase of peak current of HQ and CC, which was attributed to the large specific surface area and large number of exposure edge plane defect sites at the surface of GMC. Tt is evident that the GMC synthesized by a facile route has great potential for isomers determination.(3) N-doped N-GMC can be synthesized by using L-lysine as nitrogen and carbon precursor, mesoporous iron oxide as a catalyst with a simple solid-phase technique. In comparison to commercial Pt/XC-72catalyst, N-doped GMC presented higher limited diffusion currents and better stability for the cathodic oxygen reduction reaction (ORR) under the same studied conditions.