悬浮床加氢固体产物高值化制备超级电容器电极材料

Upcycling of Solid Products From Slurry-Bed Hydrocracking Into Supercapacitor Electrode

以重油悬浮床加氢固体产物为原料,采用化学活化法对其进行结构活化,研究工艺条件对活化产物组成结构及电化学储能性能的影响规律。结果表明:以具有石油焦中均匀分散单层二硫化钼复合结构的固体产物为原料,通过KOH活化制备得到硫化钼/多孔碳复合材料。以KOH为活化剂,当石油焦/KOH质量比为1/3时,在800℃下处理2.5 h,所得活化产物的比表面积可达1998.5 m^(2)/g。电化学测试结果表明,上述条件制得的硫化钼/多孔碳复合材料在6 mol/L KOH电解液中,电流密度为1 A/g时比电容为176.1 F/g,并具有良好的倍率性能;组装的对称超级电容器在1 mol/L Na_(2)SO_(4)电解液中,电流密度为1 A/g下能量密度为24.25 W·h/kg时,对应的功率密度为900.01 W/kg,且循环3000圈后电容保持率达到91.17%,具有良好的电化学性能及循环稳定性。

The solid product of heavy oil slurry-bed hydrocracking as raw material was treated by the chemical activation method to activate its structure,which aims to study the influence laws of process conditions on the composition,structure and electrochemical energy storage performance of the activated product.The experimental results demonstrate that the solid product with uniformly dispersed monolayer molybdenum disulfide composite structure in petroleum coke is used as raw material to prepare molybdenum sulfide/porous carbon composite materials through KOH activation.The specific surface area of the activated product can reach 1998.5 m^(2)/g at the mass ratio of petroleum coke to KOH of 1/3,and 800℃for 2.5 h.The electrochemistry test results show that the above molybdenum sulfide/porous carbon composite materials exhibit the capacitance of 176.1 F/g at the current density of 1 A/g in 6 mol/L KOH electrolyte and a good rate capability.In addition,the assembled symmetric supercapacitor device exhibits the high power density of 900.01 W/kg,energy density of 24.25 W·h/kg in 1 mol/L Na_(2)SO_(4) electrolyte,and the capacitance retention rate of 91.17%after 3000 cycles,possessing good electrochemical performance and cycling stability.