| With the voice for employing clean energy becoming higher and the more desire of portable electronic device for consumers,the research and development of energy storage with large capacity and fast charging characteristics has been urgent.Here,this dissertation focus on the design,preparation and electrochemical properties of carbon materials with different pore structure based on the understanding of the research status of electronic double layer capacitors.The main content can be concluded as followed:1.The electrochemical properties of biomass-derived hierarchical porous carbon for EDLC electrode material.In this work,we propose a novel method to obtain hierarchical porous carbon with low cost and large qualities from pomelo peel.The preparation procedure is based on an improved KOH activation process and finally get the oxygen-doped hierarchical porous carbon with large surface specific area.When served as electrode material,in a typical three-electrode system,the resultant hierarchical porous carbon delivers a specific capacitance of 285 F g-1 at a current density of 0.5 A g-1 in I mol L'1 KOH.The assembled symmetric EDLC shows a remarkable long term stability.The specific capacitance could maintain 99%after 12,000 cycles.2.Ni-embedded porous carbon material for supercapacitor.In this work,a template method was developed to prepare a mesopore-dominant porouscarbon.The preparation procedure is based on the carbonization of PMMA(solid carbon source)at the temperature of 800-100 ? with Ni(dmg)2 as template.The obtained carbon materials possess a specific surface of about 600 m2 g-1 and a narrow pore size about 4 nm.The porous carbon synthesized under 800 ? shows a high specific capacitance of 160 F g-1 at a current density of 1 A g-1 in 6 mol L-1 KOH.When served as symmetric spercapacitor in 6 mol L'1 KOH,it shows a high specific capacitance of 78.2 F g-1 at 1 A g-1 and remarkable rate capability of 46.8 F g-1 at 100 A g-1. |
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