A novel multifunctional composite based on reduced graphene oxide, poly-o-phenylenediamine and silicotungstic acid

• Published in: Synthetic metals 2020-12, Vol.270, p.116596, Article 116596
• Main Authors: Pisarevskaya, E. Yu, Kolesnichenko, I.I., Averin, A.A., Gorbunov, A.M., Efimov, O.N.
• Format: Article
• Language: English
• Subjects: Benzoquinone; Chemical synthesis; Coated electrodes; Electrochemical analysis; Graphene; Graphene oxide; Hydroquinone; Local anesthetic of amide series; Phenylenediamine; Poly-o-phenylenediamine; Saline solutions; Silicotungstic acid; Sulfuric acid
• ISSN: 0379-6779; 1879-3290
• DOI: 10.1016/j.synthmet.2020.116596

A novel electroactive composite based on silicotungstic acid (SiW), poly-о-phenylenediamine (PPD) and reduced form of graphene oxide (RGO) was prepared by electrochemical synthesis on a planar screen printed carbon electrode (SPCE) coated with graphene oxide (GO). The new material was shown to have expressed electrocatalytic activity for the example of electrochemical behavior of the p-benzoquinone/hydroquinone redox couple on the RGO-PPD-SiW-modified electrode. Unlike most composites containing heteropolyacid anions, RGO-PPD-SiW demonstrates its properties not only in an acid but also in a neutral saline solution. The potential cycling in a saline solution retains some cyclic voltammogram (CVA) peaks observed in 1 М H2SO4 environment. An addition of a local anesthetic of amide series (lidocaine, naropin, or chirocaine) to a saline solution was shown to change the CVA shape immediately. This example demonstrates that the novel composite may be further used in creating a sensor of planar design. [Display omitted] •SiW immobilization upon co-precipitation with the redox active polymer involving graphene oxide as catalyst.•RGO-PPD-SiW composite exhibits the redox activity both in acid and neutral media.•RGO-PPD-SiW electroactive composite is usable in the mediator catalysis.