| The key to fuel cells commercialization is the speed of oxygen reduction kinetics.Slow kinetics of the cathodic oxygen reduction reaction will seriously damage the battery energy and degrade energy efficiency.Although commercial Pt/C catalysts have a high oxygen reduction activity,Pt increases the cost of fuel cells and Pt/C catalyst is less stable.Therefore,it is of great significance to prepare catalysts with high catalytic activity,low cost and long service life.In this paper,nitrogen-doped biomass materials were synthesized in tube furnace with sufficient nitrogen and studied the effect of carbonization temperature on catalytic activity of carbon dioxide reductionunderconstantcarbonationtimeandannealing process.Secondly,modified Hummer Method was introduced to prepare graphene oxide materials and it was treated by hydrazine hydrate,compounded with other metal oxides and followed with plasma treatment by microwave plasma chemical vapor deposition(MPCVD).TEM,XRD and electrochemical methods reveal the effect of plasma treatment on the oxygen reduction properties of carbon-supported metals.The experiment of oxygen reduction activity of nitrogen-doped biomass carbon shows that carbonization temperature at 900?is suitable to form loose porous structure.It_'s formed by some composition in biomass materials which can react with the gaseous material and was exhausted in gas state.High carbonization temperature will damage porous structure stability,materials deformation or properties degradation.In another experiment of plasma treatment effect on graphene oxide materials loaded with Co/Cu oxide,catalytic activity was significantly improved.Specifically,starting potential was increased from-0.323 V to-0.282 V and half-wave potential is also changed from-0.543V to-0.461 V.Limited current density is improved to-3.63 mA/cm~2 that is three times higher than none-plasma treatment(-1.04 mA/cm~2).And the number of electron transfer is increased from 2.9 to 3.55 accordingly. |
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