Study Of Mesoporous Carbon And Its Composite Materials Modified Electrodes In Electrocataly And Electrochemical Sensor

Mesoporous carbon is a kind of novel advanced carbon material due to its many goodcharacteristics, such as low cost, large pore volume, high specific surface area, tunable poresize distribution and chemical inertness. In addition, mesoporous carbon has received a greatdeal of attention because of its low cost and simple nanocasting synthesis method. Theelectrodes modified with mesoporous carbon exhibit excellently electrochemical activitytoward various electroactive compounds. In this work, two kinds of mesoporous carbon wereemployed as electrode modified materials for oxygen reduction reaction (ORR) andquantitative detection of some biological substances. The major contents are as follows:1. The nitrogen-doped ordered mesoporous carbons (N-OMCs) were synthesized usingSBA-15as a template and honey as a nitrogen and carbon sources. Transmission electronmicroscopy (TEM), scanning electron microscopy (SEM), nitrogen adsorption-desorption,X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) showed that nitrogenhad been successfully doped into the framework of ordered mesoporous carbon rods. TheN-OMCs with high surface area and ordered structure were used as a metal-free catalyst foroxygen reduction reaction, which exhibited much better electrocatalytic activity, long-termoperation stability and high CH3OH tolerance compared with commercial Pt/C catalyst inalkaline solution. Moreover, the influence of different amounts of nitrogen formed at differentcarbonization temperatures in N-OMCs on the ORR activity was researched. These resultssuggest both an increased density of catalytically active nitrogen groups and a high surfacearea of N-OMCs-800have great effects on their ORR activity.2. For the first time, a simple method was developed to prepare cobalt (II) Schiff base(Co(salen))/large mesoporous carbon (LMC) composite film with Co(salen) self-assembledon the LMC modified glassy carbon electrode (GCE) surface. The structure andelectrocatalytic performance of Co(salen)/LMC film were investigated by scanning electronmicroscopy (SEM) and cyclic voltammetry (CV). The Co(salen)/LMC film exhibits highelectrocatalytic activity toward H2O2, low detection limit (8.5×10-7M) and wide linearconcentration range (2.0×10-6-8.9×10-3M). Furthermore, glucose oxidase (GOD) wasself-assembled on the surface of Co(salen)/LMC film modified electrode. The resultingbiosensor demonstrated favorable linear response to glucose and revealed good selectivity andstability. More important, our prepared biosensor realized determination of glucose in human blood serum with satisfying result.