(NH_(4))_(2)S_(2)O_(8)/AC电极制备及其电吸附性能

Preparation and electrosorption performance of(NH_(4))_(2)S_(2)O_(8)/AC electrode

为了制备电化学性能更优的活性炭电极,利用(NH_(4))_(2)S_(2)O_(8)浸渍得到改性后的APS-AC,运用EST技术筛选石墨烯微片、导电炭黑、碳纳米管中更佳的导电剂,制备电化学性能更优的APS-AC电极;通过CV、EIS、GCD和CA等测试手段比较APS-AC电化学性能,并结合吸附行动力学分析电吸附性能和吸附规律。结果表明:导电炭黑制备的APS-AC电极性能更佳,比电容为275.208 F/g;表征发现APS-AC电极的接触角变小,亲水性提高;充放电周期大,充放电性能和电荷储存能力更好。溶液中不同阴阳离子的吸附效果不同,离子去除率为K^(+)>Na^(+)、Cl^(-)>SO_(4)^(2-),吸附过程更符合准二级吸附动力学。

In order to prepare activated carbon electrodes with better electrochemical performance,modified activated carbon(APS-AC)was obtained by impregnation with(NH_(4))_(2)S_(2)O_(8).The better conductive agents in graphene microsheets,conductive carbon black,and carbon nanotubes were screened through EST technology to prepare APS-AC electrodes with better electrochemical performance.We compared the electrochemical performance of APS-AC through testing methods such as CV,EIS,GCD,and CA,and analyzed the electro adsorption performance and adsorption law in combination with adsorption kinetics.The results showed that the APS-AC electrode prepared with conductive carbon black had better performance,with a specific capacitance of 275.208 F/g.Through characterization,it was found that the contact angle of the APS-AC electrode decreased and the hydrophilicity improved.A longer charging and discharging cycle results in better charging and discharging performance and charge storage capacity.The adsorption efficiency of different anions and cations in the solution varies,with ion removal rates being K^(+)>Na^(+)、Cl^(-)>SO_(4)^(2-).The adsorption process is more in line with quasi second order adsorption kinetics.