Facile Preparation Of Several Porous Carbon Based Nanocomposites And Their Electrochemical Applications

Porous carbon material as a new catalyst and catalyst carrier has many active sites,high surface area,good conductivity,easy modification and flexible structural properties,which has been widely used in the fields of electrocatalyst support,separation,energy storage and electrochemical sensors.To further improve the electrochemical performance of porous carbon materials,the introduction of nanocatalysts in porous carbon materials is an effective method.Porous carbon materials exhibit great defect sites and large specific surface area,making them highly promising as electrocatalyst support including nanoparticles and metal oxide materials.Porous carbon based composite materials are widely used in various fields of applications,separation,energy storage and electrochemical sensors.In this paper,several porous carbon based nanocomposites were synthesized,which not only realized the highly sensitive detection of biomolecules and environmental pollutants,but also successfully applied to the catalytic oxygen reduction reaction.The main contents are listed below:1.The preparation of Pt/cerium oxide and highly ordered mesoporous carbon（Pt/CeO2/OMC）nanohybrids is reported.CeO2 can be used as an active material that enhances the electrocatalytic properties of Pt nanoparticles.OMC exhibits excellent electrical conductivity and large specific surface area,which makes it a highly promising electrocatalyst support.Benefiting from the synergistic effects of the catalytic performance of Pt/CeO2 and excellent conductivity of OMC supports,the new nanocomposite of Pt/CeO2/OMC are able to create novel features of electrocatalytic activities.Pt/CeO2/OMC tri-component composite was used as an excellent sensing platform for the determination of adrenaline.The developed Pt/CeO2/OMC tri-component composite shows excellent electrocatalytic performance for adrenaline.2.In this work,nanorod-like CoMoO₄ with unique electrochemical properties was synthesized at first.3D macroporous carbon（MPC）has large specific surface area,providing an effective support for loading nanorod-like CoMoO₄ to form CoMoO₄/MPC composites.Attributing to the synergic effects between the good electrocatalytic performance of CoMoO₄nanorods and the extraordinary electrical conductivity of 3D layered MPC,the developed CoMoO₄/MPC composite exhibited excellent activity and convincing analytical performance towards glucose.3.Pt nanoparticles and zirconium oxide（ZrO₂）immobilized on porous carbons（Pt/ZrO₂/PCs）tri-component nanohybrids derived from Pt/metal–organic frameworks（MOFs）were synthesized.At first,Pt/MOFs（Pt/UiO-66）were prepared as a template,which can be used as ZrO₂ and carbon sources.The Pt/ZrO₂/PCs show highly electrocatalytic activity for methyl parathion（MP）molecules.Owing to the combination of unique electrocatalytic activity of Pt species,excellent conductivity of PCs,and good adsorption properties of ZrO₂crystals for MP,the proposed Pt/ZrO₂/PCs tri-component nanocomposite sensor exhibits the high performance of MP.4.Herein,we put forward a low-cost approach to engineer nitrogen and cobalt co-doped mesoporous hollow carbon hemisphere（defined as HCHs）.The unique porous structure with semisphere shape provides significant number of the abundant defective sites and high electrical conductivity and shortens the mass transfer pathway,which exhibits a greatly enhanced electrocatalytic activity with mainly by 4e^-reduction.Moreover,as a result of the introduction of Co and N heteroatom,it can be explained that the synergistic effects of large electrochemically active areas and good electrical conductivity is the main reason for displaying outstanding ORR activity.Besides,the ORR activity of Co/N/HCHs nanocomposites is comparable to that of commercial Pt/C.More importantly,Co/N/HCHs nanocomposites display remarkably high electrocatalytic activity,superior stability and superb methanol tolerance in alkaline medium.