Application Research Of Heteroatom Doped Carbon Materials As The Oxygen Reduction Electrocatalyst

The widespread usage of fossil fuels bring convenience to mankind,nevertheless it also causes various of environmental problemssimultaneously, such as acid rain,atmospheric haze and global warming.Intensive attentions have been paid to develop clean energy for the sake ofthe sustainable development of human. Fuel cell is a new clean energytechnology, which possessing the advantages of environmental benignity,high conversion efficiency, etc. However, the relatively high cost and poordurability of platinum catalysts have become the greatest stumbling blocksto the large-scale commercialization of fuel cells. Much efforts havetherefore been made to exploit novel high-efficiency catalyst for oxygenreduction reaction. In recent years,various heteroatom doped carbonmaterials applied as oxygen reduction catalysts are emerging. In this paper,we attempt to investigate some more novel materials to expand theapplication of heteroatom doped carbon materials in oxygen reductionelectrocatalysis, The main points are as shown below:(1)The selenium-doped carbon nanotube/graphene composite wassynthesized with graphene oxide,CNTs and diphenyl diselenide via hightemperature annealing method. SEM,TEM and XPS results prove thatselenium has been successfully doped into carbon materials. The CV, LSV,ac impedance and chronoamperometry tests confirm that selenium dopedcarbon nanotube/graphene exhibits highly electrocatalytic activity, goodstability and resistance to toxicity for oxygen reduction reaction.(2)Hybrids deriving from various small molecules heterocyclic compounds and carbon black was successfully synthesized by a simpleultrasonic dispersion method. The electrocatalytic activities for ORR areinvestigated by CV, LSV and chronoamperometry tests in an alkalinemedium. The results preliminary confirmed that some small moleculesheterocyclic compounds indeed show good catalytic activity with a certainadditive of carbon black, In particular, the1-bromine naphthalene and1-bromine pyrene demonstrate a relatively good catalytic activity andstability for the oxygen reduction reaction (ORR).(3) Nickel dioxide coated array carbon nanotube with coaxial compositematerials (NiO-CNTs) are synthesized via the continuous spray pyrolysismethod.The electrocatalytic activities for supercapacitor electrode materialsare investigated by CV, galvanostatic discharge-charge tests in an alkalinemedium.The results indicated that the excellent electrochemicalperformance and cycle stability for supercapacitor, indicating a promissingapplication for supercapacitor.