Perparation Of Conductive Carbon Net Skeleton And Their Supercapacitor Performance

Electrospinning is a facile and practical tehnology to prepare nanofibers. adopting which can obtain nanofibers that are1～3smaller in order of magnitude, and with characteristic of huge specific surface, high length-diameter ratio, high porosity, good permeability. With the developing of nano technology and deep-going research in nano field, electrospinning tehnology has aroused widely attention both at home and abroad in academic and industrial sector. Electrochemical super capacitor is a currently developed storage device that has both the characteristic of regular physical capacitor and battery. It has become a reseach hotspot for its high specific power, high specific capacity, low cost, long cycle life, high charge/discharge efficiency. Carbon material has unique excellent characteristic in heat resistance, corrosion resistance, conductivity, solidity, which is one of the most technically advanced and earliest researched electrode materials used in electrochemical super capacitor. Carbon nanotubes (CNT) have many advantages such as highest specific strength, excellent conductivity, good extensibility, which is a great strength to composites. Carbon nanofibers (CNF) have good fatigue resistance, excellent conductivity, large specific surface and good moldability; they are widely used in the research of electric double layer capacitors’ electrodes. Grapheme (G) become popular in worldwide for Nobel prize, it has fastest electron transmission rate in room temprate. it is the thinnest and hardest nano material in the world, its extremely large specific surface can adsorb or desorb molecule and atom. Grapheme is a major breakthrough in carbon material development. We prepare carbon nano composites by electrospinning carbon-polymer organic solution and obtain high performance carbon conductive net skeleton via subsequent treatment.This paper mainly concerned about the carbon conductive net skeletons by electrospinning and its electrochemical performance. Morphology of obtained composites were characterized by scanning electron microscopy; the struction of the composites were characterized by Fourier transform infrared spectroscopy, energy dispersive spectra and specific surface, porosity test; electrochemical performance were tested by cyclic voltammetry, galvanostatic charging/discharging, electrochemical impedance spectroscopy and cycle life. Research works are as follows:1. Adopting chemical vapor deposition (CVD) to secondary grow CNT on the catalyst/CNT films that prepared by electrospinning, we obtained CNT conductive net skeleton (CNTN), whose specific capacity reached54.5F/g (in organic electrolyte).2. Prepare G/CNF conductive net skeleton in different process. One is preparing PAN nanofibers by electrospinning, then obtained GO/PAN composite with immersion method, reduced the composite with Hyrogen at high temperate, finally obtained G/CNF conductive net skeleton; the other way is firstly reduced GO into G with sodium borohydride, obtained G/PAN composite by electrospinning, then obtained G/CNF conductive net skeleton after heat treatment. Compared the electrochemical performance of G/CNF conductive net skeleton prepared in different process. We find that specific capacity of G/CNF conductive net skeleton that prepared via immersion is108.41F/g, which is smaller than the one prepared via chemical method, whose specific capacity is136.56F/g (both in organic elecrolyte).3. Prepare catalyst/PAN nanofibers by electrospinning, obtained CNT/CNF conductive net skeleton via CVD, finally polymerized PANI on CNT/CNF’s surface to form CNT/CNF/PANI composites, which has a remarkable rise in specific capacity,178.0F/g (in organic electrolyte).