Preparation And Modification Of Porous Carbon Electrode Materials By Hydrothermal Carbonization Of Glucose

This paper mainly introduced the research progress of electrode materials for supercapacitors,and analyzed the factors that influence electrode materials.Accordingly,the porous carbon was prepared with glucose as a precursor.The porosity and pore structure of carbon materials was fundamentally improved by the template and activation method.Moreover,the specific capacitance of porous carbon was significantly improved by the introduction of a small number of pseudopotential properties.The specific work is as follows:?1?The porous carbon was prepared by KOH activation with temperature800?and time 2 h.The effects of different KOH ratios on pore structure,specific surface area and electrochemical performance of porous carbon materials were systematically studied.At high temperature,KOH havd some reactions,such as Dehydration reaction and carbon elimination reaction,which can expand the pore size on the carbon sphere,improving the wettability of the surface of the porous carbon and the utilization of surface area.The result showed that when the ratio of KOH and hydrothermal carbon spheres was 1:3?AC-3?,the porous carbon had a higher specific capacity?207 F/g?.And,after1000 cycles of cyclic testing,capacity retention was 96.7%,showing good excellent cycling performance and under the current density of 10 A/g,capacity retention was 77.8%,showing better multiplier performance.In addition,AC-3had a very suitable pore size?³.64 nm?,a higher specific surface area?¹563m²/g?,and a suitable pore volume?².29 cm³/g?.A simple capacitor is made by using AC-3 as the cathode,and the bulb is informed?2?The porosity and pore size distribution of porous carbon materials were improved by using NiCl₂·6H₂O as a template with glucose as the precursor.Accordingly,the appropriate activation conditions:temperature?⁸00??,time?² h?,the activation ratio of KOH?³?.Besides,the porous carbon was prepared by removal of template and KOH activation.Also,we have discussed the influence of the ratio of template on the pore structure and electrochemical performance of porous carbon.The result showed that the ratio of NiCl₂·6H₂O and glucose was 1:3?AC-NiCl₂-3?,the porous carbon had a high specific capacitance?³50 F/g?.In addirion,after 1000 cycles of cyclic testing,capacity retention was 96.7%,showing good excellent cycling performance and under the current density of 10 A/g,capacity retention was 77.8%,showing better multiplier performance.?3?Highly electrochemically nitrogen doped porous carbon material?AC-GO-N?were successfully prepared by doping graphene oxide and urea with glucose as the precursor.The graphene oxide was introduced to improve the conductivity of the porous carbon material.Besides,the nitrogen containing functional groups can improve the surface wettability of porous carbon materials and improve the surface utilization of the materials.The observation of XRD spectra showed that AC-GO-N had a better conductivity,which increased the ion transport rate and the specific capacitance?³20 F/g?of the porous carbon electrode material.?4?The AC-3@Mn₃O₄ composite material was prepared using K₂MnO₄ with hydrothermal reaction on AC-3.The pore structure of porous carbon is beneficial to the rapid transport of ions which can improve the rate of redox reaction and improve the specific capacitance of the electrode material.By observing the XRD spectrum,it can be found that Mn₃O₄ has been successfully deposited.It was found that the specific capacitance increased from 207 F/g to442 F/g by electrochemical test.And,the ratio of specific capacitance was 90.3%after 1000 cycles.In addition,it is shown that AC-3@Mn₃O₄ composite material was successfully combined with the high performance of pseudo capacitance and the good cycling performance of double layer,thereby improving the usability and application prospect of electrode materials.