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以生物质秸秆炭化物为基础炭材料,采用无机酸处理,除去其中的硅酸盐组分,制备超级电容器用活性炭。利用扫描电镜及能谱分析和红外吸收光谱表征了反应前后活性炭的结构及组分变化。利用循环伏安方法考察了活性炭处理前后的电化学性能。结果表明:酸处理可溶去炭材料中的无机组分,处理后活性炭中硅含量明显减少;无机组分的除去有利于炭材料形成更丰富的孔结构,为电解液提供输运通道,导致炭材料比电容加大,循环伏安曲线显示出良好的可逆特性;随着处理时间延长,超级炭材料的比电容逐步加大,最高比电容达426.3F/g,比原样炭提高了50%以上,活性炭循环3 000次后的比电容仍保持97.2%。
Based on biomass straw charcoal-based carbon material, the silicate component was removed by inorganic acid treatment to prepare activated carbon for supercapacitor. The structure and composition of the activated carbon before and after the reaction were characterized by scanning electron microscopy, energy dispersive spectroscopy and infrared absorption spectroscopy. The electrochemical properties of activated carbon before and after treatment were investigated by cyclic voltammetry. The results showed that the acid content of soluble de-carbonized material was significantly decreased after treated with activated carbon, and the removal of inorganic components favored the formation of richer pore structure of carbon materials and the transport of electrolyte to electrolyte, resulting in The cyclic voltammetry curve shows a good reversible property. With the prolongation of treatment time, the specific capacitance of super charcoal material increases gradually, the maximum specific capacitance reaches 426.3F / g, which is 50% higher than the original charcoal. Above, the specific capacitance of activated carbon after 3000 cycles remains 97.2%.