沥青改性稻壳基活性炭的制备及电化学性能

Preparation and Electrochemical Properties of Rice Husk Based Activated Carbon Modified by Pitch

以固定碳含量高、导电性好的沥青为改性剂,通过低温混匀、中温固化的方法对稻壳基活性炭进行改性.结果表明,沥青与活性炭的最优质量比为1∶5,沥青改性后的稻壳基活性炭在1 mol/L Et4NBF4/PC电解液中,体积比电容由67.54 F/mL提升至84.34 F/mL.在1 A/g电流密度下恒流充放电10000次后,沥青改性的活性炭仍有91.52%的电容保持率,远高于未改性活性炭的保持率(84.11%).

Coal tar pitch with high carbon content and good conductivity were used as surface coating agents to modify rice husk-based activated carbon（RHAC） by low temperature mixing and medium temperature curing. The experimental results show that the optimum mixing mass ratio of pitch to RHAC is 1 ∶ 5,in the organic electrolyte 1 mol/L of Et4 NBF4/PC system,the volumetric capacitance from the original 67. 54 F/mL to 84. 34 F/mL. The volumetric capacitance was significantly increased. In addition,in the cyclic stability test,the capacitance retention rate of pitch-coated activated carbon was 91. 52%,which was higher than that of unmodified activated carbon（84. 11%） after 10000 cycles at the current density of 1 A/g. This method has greatly improved the electrochemical performance of rice husk-based activated carbon,which is simple and easy,green and pollution-free,provides a feasible method for the industrial production.