Preparation And Properties Of Carbon/Polyaniline Composite

As conducting polymer, polyaniline （PANI） is regarded as one of the most promisingelectrode materials because of its stable property at room temperature, low cost, easysynthesis and good conductivity. In this thesis, we report a simple process to synthesis thecomposites of graphene oxide （GO） and carbon nanotube （CNTs） doped with PANI in situpolymerization and investigate different content of PANI for the effect of microstructure bySEM、TEM、XRD、XPS、FTIR and UV-vis. Then, we use carbon/polyaniline composites asattractive precursor to synthesis activated carbon which own high specific surface area andsufficient pore channel through carbonization and activation process, and retrain the originalmicrostructure by control parameters. After that, we use carbon/polyaniline composites as thepositive electrode and activated carbon as the negative electrode to assemble the hybridelectrochemical super capacitor, and investigate different negative electrode for the effect ofthe electrochemical property of supercapacitor in1mol·L^-1H₂SO₄electrolyte between thepotential of0¹.4V. The detail research content and results are summarized as follows:First of all, we use graphene oxide as deposited carrier and carbon nanotube asconductive agent to dope with PANI and then form graphene oxide/carbon nanotube/PANIcomposites through situ polymerization. Graphene oxide is the best choice for depositedcarrier, due to its high surface area and vast containing-oxide functional group, can perfectlyintegrate with PANI. Meanwhile, the introduce of carbon nanotube, not only open the morelayer structure of graphene oxide, but also is a kind of conducting agent to connect layergraphene oxide and provide more electronic transmission path to enhance the property ofcomposite. When the mass ratio of GO/CNTs/PANI composite was kept in at1:1:10（GCP10）,the specific capacitance of GCP10can reach to608F·g^-1at current density of0.2A·g^-1in1mol·L^-1H₂SO₄electrolyte, and larger than pure PANI which only own394F·g^-1.Secondly, we choose different ratio of carbon/polyaniline composites as attractiveprecursor to synthesis activated carbon and investigate different content of PANI for theeffect of the microstructure and property of the composite. We find that the more content ofPANI in attractive precursor, the better specific capacitance of activated carbon. The specificcapacitance of GP100-H、GP50-H can achieve to361and270F·g^-1at the scan rate of2mV·s^-1in6mol·L^-1KOH electrolyte。After1000consecutive cycles, the capacitance retention of GP100-H and GP50-H still kept97%and89%of their initial capacitance. It shows thatactivated carbon own a good reversible performance.In the last section, we assemble a hybrid electrochemical super capacitor which usegraphene oxide/carbon nanotube/polyaniline as positive electrode and activated carbon asnegative electrode, and investigate different negative electrode for the effect of theelectrochemical property of supercapacitor in1mol·L^-1H₂SO₄electrolyte between thepotential of0¹.4V. By calculation, we can conclude that the hybrid capacitor ofGP100-H//GCP10can reach to206F·g^-1at scan rate of2mV·s^-1, which is about1.7times ofGP50-H//GCP10(126F·g^-1). Moreover, the energy density of GP100-H//GCP10hybridcapacitor reach to57Wh·Kg^-1when the power density is290W·kg^-1, and still kept10Wh·Kg^-1when the power density is1214W·kg^-1, it’s better than the other two hybridelectrochemical super capacitor.