Study On Preparation And Modification Of High Surface Area Biomass Carbon Materials

Super capacitor due to its high energy density,cycle stability and environment friendly characteristics such as good favored.The biomass raw materials as a starting point,the influence of temperature,activation conditions and other factors on the biomass carbon surface area of the material,effects of pore size and electrical properties.The conclusions are as follows:Choose peanut shell,rice husk,high surface area carbon materials such as biology,successfully prepared the biomass carbon materials,preliminary experimental results show that the specific surface area is the main factor affecting the electrochemical properties of biomass based carbon materials.By peanut shell,rice husk,high surface area carbon biological material preparation of biomass the specific surface area of carbon materials were 548.2?333.6?1079.7 cm² g^-1,the current density under the conditions of 0.5 A g^-1 is 156.3?145.3?238.1 F g^-1 discharge capacity,with high specific surface area and high surface area for biomass carbon performance by biological carbon materials is best.By carbonization temperature control surface area.High surface area carbon materials in biomass carbonization temperature under the condition of 700?800?900? the surface area is 558.2?1079.7?644.9 cm² g^-1,at 800? during the carbonization process,can obtain two-dimensional sheet biological carbon materials,when the current density of 0.5 A g^-1?1 A g^-1?2 A g^-1?5 A g^-1 mass ratio of capacity is up to 238.1 F g^-1?210.2 F g^-1?190.1 F g^-1?180.1 F g^-1.Life cycle test results show that after 5000 charge discharge cycles,the capacity retention rate is 100%.Through the activation of the improvement of the electrochemical properties.Using ZnC l2-KCl?KC l?KOH on the biological carbon materials were activated,further regulation of specific surface area and pore structure.When the current density is 0.5 A g^-1,the quality is better than capacity,the highest activation of KCl was 345.0 F g^-1,after 5000 cycles remained at 100%,and transfer resistance from 0.18?,reduced to 0.11?.