Iodide-mediated room temperature reduction of graphene oxide: a rapid chemical route for the synthesis of a bifunctional electrocatalyst

Ashok Kumar Das, Manish Srivastav, Rama K. Layek, Md Elias Uddin, Daeseung Jung, Nam Hoon Kim, Joong Hee Lee

    Research output: Contribution to journalArticleScientificpeer-review

    105 Citations (Scopus)

    Abstract

    Synthesis of reduced graphene oxide (RGO) from graphite oxide (GO) usually involves the use of some harmful reducing agents. Here, we report a simple approach for the reduction of GO at room temperature using a mixture of potassium iodide and hydrochloric acid. The reduction of GO involves (a) iodide mediated epoxide ring-opening, resulting in hydroxyl groups and dehydration to the corresponding olefins, (b) hydroxyl group substitution by iodide ions, and (c) elimination of iodide ions on the surface. The as-synthesized RGO has an electrical conductivity of 1251 S m(-1) and an excellent electrocatalytic activity. The electrocatalytic activity of RGO towards the electrochemical reduction of oxygen and the oxidation of hydrazine was investigated. The RGO-based electrode showed pronounced electrocatalytic activity towards the reduction of oxygen and the oxidation of hydrazine in 0.1 M KOH. At alkaline pH, the reduction of oxygen and oxidation of hydrazine were observed at -0.35 and 0.5 V, respectively. In comparison with the bare glassy carbon (GC) electrode, a spectacular decrease in the overpotential and considerable increase in the oxidation peak current for hydrazine were observed on the RGO-based electrode without using any redox mediator. The RGO-based platform is highly sensitive towards the electrochemical oxidation of hydrazine and reproducible results were obtained. Moreover, the RGO-based electrode showed excellent operational and long time storage stabilities. The sensitivity of the electrode was calculated to be 0.137 +/- 0.02 mu A mM(-1).

    Original languageEnglish
    Pages (from-to)1332-1340
    Number of pages9
    JournalJournal of Materials Chemistry A
    Volume2
    Issue number5
    DOIs
    Publication statusPublished - 2014
    Publication typeA1 Journal article-refereed

    Keywords

    • ENHANCED CAPACITIVE DEIONIZATION
    • GLASSY-CARBON ELECTRODES
    • GRAPHITE OXIDE
    • ELECTROCHEMICAL PROPERTIES
    • THERMAL REDUCTION
    • OXYGEN REDUCTION
    • HYDRAZINE
    • NANOSHEETS
    • FILMS
    • COMPOSITES

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