吸附电活性染料的活性炭电极电化学性能

采用商用活性炭（AC）吸附二元混合染料亚甲基蓝（MB）和胭脂红（AR18），制备得到AC/(MB+AR18)电极材料。比较单一活性炭（AC）和吸附不同浓度的二元混合染料后的活性炭AC/(MB+AR18)]的电化学性能。三电极体系的测试结果表明：在1mol/L H₂SO₄电解液中，当电流密度为1A/g时，吸附了浓度为400mg/L污染物的AC/(MB+AR18)比电容为182F/g，高于单一AC的比电容（109F/g）。随后选用性能最优的AC/(MB+AR18)-400作为电极材料，组装对称超级电容器器件，发现工作电压窗口从只用AC组装的对称超级电容器的1.1V提高到1.5V，电流密度为0.75A/g时，功率密度为843.84W/kg，能量密度可达32.23W·h/kg，远远高于AC组装的超级电容器(4.74W·h/kg)，说明MB和AR18不仅为AC提供额外的法拉第电容，同时有助于提高其工作电压窗口。

Electrochemical performance of activated carbon electrode adsorbing electroactive dyes

Commercial activated carbon (AC) was used to adsorb binary mixed dyes of methylene blue (MB) and Carmine (AR18) to prepare AC/(MB+AR18) electrode materials. The electrochemical performance of activated carbon (AC) and that adsorbed different concentration binary mixed dyes AC/(MB+AR18)] was compared. The test results of the three-electrode system showed that, in 1mol/L H₂SO₄ electrolyte and under the current density of 1A/g, the specific capacitance of AC/(MB+AR18) after adsorbing in a concentration of 400mg/L pollutants was 182F/g, higher than that of the single AC (109F/g). Subsequently, AC/(MB+AR18)-400 with the best performance was selected as the electrode material to assemble a symmetrical supercapacitor device. It is found that the operating voltage window of AC/(MB+AR18) was increased to 1.5V, compared to 1.1V for the symmetrical supercapacitors assembled with AC only. When the current density was 0.75A/g, the power density was 843.84W/kg, and the energy density reached 32.23W·h/kg, higher than that of the supercapacitor assembled by activated carbon (4.74W·h/kg), which suggested that MB and AR18 not only provided additional Faraday capacitance for AC, but also helped to increase its operating voltage window.