石墨烯/纳米纤维素/亚甲基蓝修饰电极的电化学行为研究

采用电化学还原法在玻碳电极上直接制备了石墨烯/亚甲基蓝(GR/MB)﹑石墨烯/纳米纤维素(GR/NCC)﹑石墨烯/纳米纤维素/亚甲基蓝(GR/NCC/MB)修饰电极,研究了不同修饰电极的循环伏安行为.研究表明:相比GR/MB电极,GR/NCC/MB修饰电极对亚甲基蓝的电化学活性要高,氧化还原峰电流值可达4~5倍.其扫速的平方根与峰电流成线性关系.当石墨烯与纳米纤维素的质量比达到1.00∶4.60到1.00∶5.75时电化学活性最高.纳米纤维素和电化学还原的石墨烯通过协同作用增加亚甲基蓝的吸附能力,从而使GR/NCC/MB修饰电极表现出优异的电化学性能.

Study on electrochemical behavior of GR/NCC/MB modified electrode

Different modifying electrodes of GR/MB, GR/NCC, GR/NCC/MB were prepared on glass carbon electrode by direct electrochemical reduction method. The cyclic voltammetry was used to study the electrochemical behavior with different modified electrodes. The results showed that the GR/NCC/MB electrode had a better electrochemical reactivity on methylene blue than GR/MB electrode, and the redox peak current could reach 4-5 times as higher as others,and it could also be seen that the square root of scan rates were linearly related to the peak currents, and the best mass ratio of NCC and GC could reach 1.00： 4.60 to 1.00： 5.75, which performed the highest electrochemical reactivity for the GR/NCC/MB electrode. The nanocrystalline cellulose （NCC） and electrochemically reduced graphene （GR） had a synergistic effect on the adsorption of methylene blue （MB）, thus improving electrochemical performance of the GR/NCC/MB electrode.