Preparation And Electrocatalysis Application Study Of Heteroatom Doping Carbon Nanocomposite Materials

Carbon nanomaterials are a kind of good catalyst supporter due to its high surface area, massive pores, environmentally friendly, low price and unique frame. Recent years, carbon nanomaterials have been widely used in electrochemistry area, such as used as electrocatalyst of sensor and fuel cell. Thence, in order to improve the electrical performance of catalyst, by the method of introducing heteroatom to optimize the structure and surface properties, further optimize the electrocatalytic behavior. We systematically studied the preparation and electrochemical performance of carbon nanomaterials doped by heteroatom. This dissertation mainly consists of the three aspects: literature review, experiment and conclusion. The content was listed below:1. Pt nanoparticles supported, P-doped ordered mesoporous carbons(Pt/POMCs) nanocomposits as efficient anode electrocatalysts for direct methanol fuel cell(DMFC) were synthesized using hard template method. The surface structure of Pt/POMCs was characterized by transmission electron microscopy(TEM), X-ray photoelectron spectroscopy(XPS) and the electrochemical behavior was characterized by cyclic voltammetry(CV) and chronoamperometry(CA). The results showed that Pt/POMCs own larger electrochemical active surface area(ECSA), higher catalytic oxidation of methanol and CO-tolerance than that of Pt/OMCs, Pt Ru/XC and Pt/C. The improvement of these properties indicated that Pt/P7 OMCs with reasonable P content can be used as the excellent anode catalysts of DMFC.2. Additional doping of phosphorus into polypyrrole functionalized nitrogenous carbon nanotubes(P/NCNTs) as metal-free electrocatalyst used to enhance the activities of oxidation reduction reaction(ORR) in alkaline solution. TEM, XPS showed that P atoms bonded with carbon framework can introduce defect sites and thereby can induce uneven charge distribution. Additionally, the content of pyridine nitrogen increased after introducing P atoms, which attributed to improve ORR activities. CV and rotating disk electrode(RDE) results show that the P/NCNTs composites can greatly improve ORR activity, stability and methanol interference resistance. The improvement of these properties indicated that P/NCNTs can be used as the excellent metal-free ORR electrocatalyst.