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以NaOH为活化剂,采用两步热化学过程制备出木基活性炭。将所制活性炭用作以硫酸为电解液的超级电容器电极材料。探讨了合成条件对活性炭孔结构和电化学性能。结果表明,在微孔中形成双电层电容,介孔和大孔则实现离子运输。在高的活化温度或高碱炭比下,材料被过度活化,导致高的介孔、大孔孔容,这增加了电解液的吸收,从而降低质量比电容。最佳的活性炭合成条件为,活化温度:600℃,碱炭比:1.25。
Using NaOH as activator, a two-step thermochemical process was used to prepare wood-based activated carbon. The activated carbon is used as a supercapacitor electrode material with sulfuric acid as electrolyte. The pore structure and electrochemical properties of activated carbon were discussed. The results show that the formation of double-layer capacitance in the micro-hole, mesopores and large holes are ion transport. At high activation temperatures or high carbon / carbon ratios, the material is over-activated, resulting in high mesopore, macropore pore volumes, which increase the electrolyte absorption, thereby lowering the mass specific capacitance. The best conditions for the synthesis of activated carbon, activation temperature: 600 ℃, the ratio of alkaline carbon: 1.25.