Carbon Doped Electrospinning Nanofibers Electrode And The Application In Fuel Cell

Membrane electrode assembly(MEA)is the key part of the proton exchange membrane fuel cell(PEMFC).Its structure has a significant impact on the output voltage and catalyst utilization of PEMFC.As a new kind of nanofiber production technology,electrospinning can synthesize nanofiber with high porosity and specific surface area.In this paper,nano-carbon materials doped electrospun nanofiber electrode had been prepared.It can optimize the structure of MEA and effectively reduce the thickness of the MEA.Besides,it improved the electrical conductivity and porosity of the electrode.Thus,it can improve the performance of membrane electrode.The PAN/PVDF nanofibers single electrode prepared by electrospinning had porous nanofiber structure.The influence of mass ratio of PAN/PVDF on electrospinning solution's viscosity and co-spinning nanofiber's morphology had been researched.The results of viscosity and scanning electron microscopy(SEM)images showed that when the mass ratio of PAN/PVDF was 4/6,the electrospinning solution had better spinnability and the electrospun nanofiber had uniform diameter with no beads.The results of AC impedance and CV curves showed that the resistance of co-spinning nanofiber membrane increased with the increase of electrospinning time.Besides,the electrochemical surface area(ECSA)decreased with the increase of electrospinning time.To improve the conductivity of co-spinning nanofiber membrane,nano-carbon materials had been doped on the electrospun nanofibers,and nano-carbon materials(BP2000,MWCNTs and GO)had good conductivity.The effect of different content of these three kinds of nano-carbon materials on the morphology and performance of nanofibers had been researched.The results of AC impedance and CV curves were showed as follow: when the dosages were the same,GO had the most significant effect on the enhancement of the conductivity of co-spinning nanofiber membrane.Especially,compared with commercial single electrode,the ECSA increased 56% when the GO content was 2 wt% and the electrospinning time was 10 min.Besides,the fiber surface was smooth and the diameter of fibers was uniformly distributed.Researching the fuel cell performance of PAN/PVDF electrospinning nanofiber MEA(electrospinning 10 min),2 wt% GO doped electrospinning nanofiber MEA(electrospinning 10 min)and the commercial MEA,the results of polarization curves showed that at the same current density,the output voltage of 2 wt% GO doped electrospinning nanofiber MEA was higher than the other two samples.Besides,the power density of 2 wt% GO doped electrospinning nanofiber MEA was higher than others.Indicating that GO doped electrospinning nanofiber MEA with high electrical conductivity and porosity can enhance the triple reaction boundary and promote gas and water transport channel throughout the porous electrode.Thus,it improved the properties of fuel cell.