The Preparation Of Catalyst Based On Mesoporous Carbon And Their Electrocatalysis Application

Mesoporous carbon catalysts have been attracting special focus mainly due to their promising applications for electrocatalytic and electrochemical analysis. In order to improve the electrocatalytic ability of mesoporous carbon catalysts, researchers have been devoted to introduce precious metals or heteroatoms into carbon materials. In this work, we fabricated well-dispersed Pt nanoparticles on ordered mesoporous carbon and developed a facile green synthesis of nitrogen-doped mesoporous carbon, and then researched their electrocatalytic application. The major contents are described as follows:1. Polydopamine(PDA)-coated ordered mesoporous carbons(OMCs) were easily prepared through one-step self-polymerization of dopamine on OMCs matrix at room temperature. Pt nanoparticles(NPs) were deposited on OMCs-PDA via a simple chemical reduction. The abundant amino and catechol groups of PDA are helpful for uniformly grafting charged metal complex [Pt Cl6]2- that can be transformed into Pt NPs upon reduction, dispersing these Pt NPs and then generating ultra-fine Pt NPs with enhanced electrocatalytic ability. The obtained OMCs-PDA/Pt exhibits significantly improved electrocatalytic responses towards hydrogen peroxide(H2O2) reduction and hydrazine(N2H4) oxidation compared with OMCs/Pt and OMCs. The electrochemical properties and electrocatalytic ability of the modified electrode make OMCs-PDA/Pt nanocomposite promising for being developed as a new electrode material for electrochemical sensors and biosensors.2. Using polydopamine as carbon and nitrogen precursor and commercial hydrophilic nano-Ca CO3 as hard-template, we developed a one step, cost-effective and green synthesis approach for the fabrication of nitrogen-doped mesoporous carbon(NPC). Three NPC samples were fabricated and then used as electrocatalysts for electrochemical detection of nitrobenzene(NB) and N2H4. The resulting NPC-2 with largest BET surface area and highest amounts of pyrrolic N and graphitic N showed outstanding electrocatalytic activity towards NB and N2H4. The NPC-2 exhibited low detection limit, good anti-interference,excellent reproducibility and long-term stability, which proved that the as-synthesized NPC materials hold great promise for the design of environmental sensors.