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为了探究表面改性对活性炭孔结构及热电转换性能的影响,使用HNO3、KOH在不同条件下对活性炭进行表面改性,用N2吸附法和XRD图谱表征活性炭改性前后孔结构和石墨化程度的变化。结果表明,改性后活性炭的比表面积和孔容提高,平均孔径减小,并存在石墨晶体结构。干法改性活性炭的比表面积和总孔容由1077.880m2/g和0.763cm3/g分别增加到1635.268m2/g和1.128cm3/g,并且微孔的孔容增加。改性处理可以去除活性炭中的杂质。分别以改性前后活性炭为电极材料制备固体电极,KCl为电解液,测试活性炭电极的热电转换性能,发现改性后活性炭具有更高的热电转换性能。
In order to investigate the effect of surface modification on the pore structure and thermoelectric conversion properties of activated carbon, the activated carbon was modified by HNO3 and KOH under different conditions. The pore structure and graphitization degree of activated carbon were characterized by N2 adsorption and XRD patterns Variety. The results showed that the specific surface area and pore volume of activated carbon increased, the average pore diameter decreased, and the graphite crystal structure existed. The specific surface area and total pore volume of the dry-modified activated carbon increased from 1077.880m2 / g and 0.763cm3 / g to 1635.268m2 / g and 1.128cm3 / g, respectively, and the pore volume increased. Modification can remove impurities in activated carbon. The activated carbons before and after the modification were used as the electrode material to prepare the solid electrode. KCl was used as the electrolyte to test the thermoelectric conversion performance of the activated carbon electrode. The modified carbon showed higher thermoelectric conversion performance.