Prepration Of Nitrogen-doped Porous Carbon By Salt Template Method And Their Electrocatalysis Applications

The Porous carbon materials are widely used in various field due to their low specific weight,good electronic conductivity,extraordinarily chemical and thermal stability.We have reported a convenient and low-cost method to prepare nitrogen-doped porous carbon materials(NPCs)using inorganic salts as template,investigating their applications in supercapacitors and the detection of amino acid.The specific contents and main innovations of this dissertation are described as follows:Inorganic salts and poly(o-phenylenediamine)(PoPD)were used as the template and precursor,respectively.Mixing the PoPD with salts and the salt phase was easily removed by simple washing with water after carbonization and the nitrogen-doped porous carbon materials were prepared.In order to obtain the porous carbon materials with different porosity and nitrogen content,we further optimised the amount of inorganic salt porogen and carbonization temperature.The characteristics of porous carbon materials were investigated by some effective measurements,such as scanning electron microscope,transmission electron microscopy,Raman,nitrogen adsorption-desorption measurements,X-ray photoelectron spectroscopy and so on.According to the results,it had been found that the NPCs prepared at 800 °C with the salt:carbon precursor mass ratio of 6:1 were partial graphitization and possessed hierarchically porous structure,large specific surface area and high heteroatom-doping(14.86 wt%),which are the keys to strengthen electrochemical performances of the porous carbon materials.The prepared NPCs was tested as the electrode materials of supercapacitors by using cyclic voltammetry and galvanostatic charge-discharge cycling.According to the results,the NPCs possessed excellent specific capacitance(364.93 F g-1 at 2 mV s-1),outstanding specific energy and good cycling stability.Moreover,the symmetric supercapacitor array fabricated with the NPCs can easily power the light-emitting diode(LED),demonstrating the practical application of the NPCs in energy storage.The prepared nitrogen-doped porous carbon materials were modified with ?-cyclodextrin.The ?-cyclodextrin could bind with the tryptophan(Trp)enantiomers throught the inclusion reaction in their hydrophobic cavity.The abilities of Trp enantiomers to form the inclusion complexes with the ?-cyclodextrin were not the same due to the various configurations,resulting in the different aggregation degree of tryptophan enantiomers on the surface of the modified electrode,constructing a small molecule amino acid sensor.The Trp enantiomers and amino acid with different configuration can be identified by differential pulse voltammetry(DPV),offering a new method for the identification and detection of amino acids.