大碳层间距的沥青基多级孔碳材料的制备及其在超级电容器中的应用

基于KOH活化法,以纳米级片层多孔MgO为模板剂,制备大碳层间距的沥青基超级电容器用多级孔碳材料.考察了模板剂添加量对多孔碳材料孔分布、碳层间距等理化性能及电化学性能的影响.结果表明模板剂添加量为沥青质量的25％时,多孔碳材料比表面积、孔体积分别为2634 m2·g-1、1.12 cm3·g-1,碳层间距高达0.374...

Synthesis of Multi-stage Pore Carbon Material with Large Spacing of Carbon Layers from Asphalt for Supercapacitors

Based on the nanoscale lamellar porous MgO as template, a facile method of petroleum pitch via in-situ KOH activation was designed to obtain multi-stage pore carbon material with large spacing or carbon layers. Meanwhile, the effect of the amount of template on the physicochemical and chemical properties of porous carbon materials, such as pore distribution, carbon layer spacing and electrochemical properties were investigated. The results showed that the specific surface area and pore volume of the carbon material were 2 634 m²·g^-1, 1.12 cm³·g^-1 respectively. What''s more, the spacing of carbon layers was 0.374 nm, when the dosage of template was 25% of the quality of asphalt. As electrodes for supercapacitors, 338 F·g^-1 at 1 A·g^-1, 277 F·g^-1 at 20 A·g^-1, and superior cycle stability with 93.5% capacitance retention at 1 A·g^-1 after 10 000 cycles in 6 mol·L^-1 KOH electrolyte, demonstrating excellent electrochemical performance.