Synthesis of Electroactive Composite Based on Poly-o-Phenylenediamine and Graphene Oxide

Thus, formation of a strong chemical bond as a result of prolonged contact of unreduced GO on a support with the OPD solution was confirmed. GO is partially reduced as a result of chemical redox interaction, while OPD is oxidized and partially polymerized. Electrochemical oxidation of the obtained composite during the cycling leads to the further OPD polymerization; here reduction of GO continues and occurs at much lower cathodic potentials than in the absence of OPD, which in this case plays the role of a mediator of the electrocatalytic reaction. PPD embedded into the composite structure does not allow RGO nanosheets to corrugate and imparts the composite morphology the shape of globules with a clearly pronounced structure.
As a result, the RGO–PPD composite is obtained that demonstrates pronounced electroactivity and a higher capacitive component in a wider range of potentials than in the case of nonmodified PPD.

因此，在还原态氧化石墨烯（GO）与载体上的OPD溶液长时间接触后，形成了强烈的化学键，这一现象得到了证实。由于化学氧化还原相互作用，GO部分还原，而OPD被氧化并部分聚合。在循环过程中，所获得的复合材料的电化学氧化导致OPD进一步聚合；在此过程中，GO的还原持续进行，且在阴极电位远低于无OPD存在的情况下发生，在此情况下，OPD充当电催化反应的媒介。嵌入复合材料结构中的PPD不允许RGO纳米片产生波纹，并赋予复合材料具有明显结构特征的球形形态。因此，获得的RGO-PPD复合物在更广泛的电位范围内表现出显著的电活性和比非改性PPD更高的电容分量。