Electrospun Graphene Composite Fibers for Electrode Materials of Supercapacitors

• Main Authors: Chi-Wei Wang, 王淇威
• Other Authors: Rong-Fuh Louh
• Format: Others
• Language: zh-TW
• Published: 2013
• Online Access: http://ndltd.ncl.edu.tw/handle/11269913155422914126

碩士 === 逢甲大學 === 綠色能源科技碩士學位學程 === 101 === The major task involved in this study has twofold: (a) fabrication graphene composite fibers by electrospinning process (ESP) and (b) manufacturing and characterization of a supercapacitor electrode using activated graphene composite fibers by adding acetylene carbon black and PVDF solution. The size distribution of graphene composite fibers were adjusted by PVA concentration, applied electric field, work distance, flow rate of PVA/graphene suspension, needle specifications during the ESP process and carbonization temperature after the ESP process. The results showed that graphene composite fibers with avg. dia. of 73~225 nm were derived from ESP under a flow rate of 0.1 ml/hr of mixture of 1 ml graphene oxide aqueous solution (6 wt%) and 2 ml polyvinyl alcohol (PVA) aqueous solution (15 wt%) to be electrosprayed through a syringe needle of 0.5 inch long and 0.84 mm diameter under applied working voltage of 10 kV at a working distance of 10 cm. The crystalline phase and microstructure of acquired graphene composite nanowires and nanofibers were analyzed by FESEM, EDS, XRD and Raman spectroscopy. Under the electrochemical testing conditions of 1 M H2SO4 electrolyte and C-V scan rate of 25 mV/s, the optimized specific capacitance of electrical double-layer capacitors of such eletrospun graphene composite fibers was 33.19 F/g, which was enhanced to be 44 F/g when the chemically activated graphene composite fibers were applied.