Preparation And Electrochemical Properties Of Nitrogen-carbon Composites By Electrostatic Spinning

Nitrogen-doped carbon material has a series of advantages,such as diverse structure,rich surface state,strong controllability,good chemical stability,high surface activity,acid and alkali resistance,high temperature resistance,etc.,which is making it widely used in fuel cells,supercapacitors and other electrochemical energy storage devices.In this paper,nitrogen doped carbon nanofibers?NCNFs?were prepared by electrospinning,preoxidation,carbonization and activation of PAN/PVP polymer mixture solution and PAN/?Co?NO₃?₂?*6H₂O solution.The effects of carbonization temperature and doping ratio on the electrocatalytic and capacitance properties of the materials were investigated.The results showed that PAN/PVP-based NCNFs had abundant pore structure,and the electrocatalytic and capacitance properties of NCNFs materials were significantly improved after KOH activation treatment,and had good anti-methanol interference performance and ORR stability.At 1000?of carbonization temperature,PAN:PVP=2:1 ratio of polymer materials under the ORR activity,initial potential reached-86 m V,differ with commercial Pt/C 56 m V,electron transfer number is 3.95.In the 900?carbonization temperature PAN:PVP=2:1 ratio of polymer materials under the specific capacitance value maximum,118.5 F/g.Co-N/CNFs with co-doping of cobalt-nitrogen has good anti-methanol interference performance and better ORR stability than non-metal-doped carbon nanofibers.In the carbonization temperature is 850?,PAN:?Co?NO₃?₂?*6H₂O=2:1Co-N/CNFs ORR starting voltage up to-78 m V,differ with commercial Pt/C 48 m V,electron transfer number is 3.80.In the carbonization temperature is 850?,PAN:?Co?NO₃?₂?*6H₂O=4:1,Co-N/CNFs specific capacitance value as high as 109.6 F/g.