Redox response of reduced graphene oxide-modified glassy carbon electrodes to hydrogen peroxide and hydrazine

Shigehiro Takahashi, Naoyuki Abiko, Jun Ichi Anzai

Research output: Contribution to journalArticlepeer-review

19 Citations (Scopus)

Abstract

The surface of a glassy carbon (GC) electrode was modified with reduced graphene oxide (rGO) to evaluate the electrochemical response of the modified GC electrodes to hydrogen peroxide (H2O2) and hydrazine. The electrode potential of the GC electrode was repeatedly scanned from -1.5 to 0.6 V in an aqueous dispersion of graphene oxide (GO) to deposit rGO on the surface of the GC electrode. The surface morphology of the modified GC electrode was characterized by scanning electron microscopy (SEM) and atomic force microscopy (AFM). SEM and AFM observations revealed that aggregated rGO was deposited on the GC electrode, forming a rather rough surface. The rGO-modified electrodes exhibited significantly higher responses in redox reactions of H2O2 as compared with the response of an unmodified GC electrode. In addition, the electrocatalytic activity of the rGO-modified electrode to hydrazine oxidation was also higher than that of the unmodified GC electrode. The response of the rGO-modified electrode was rationalized based on the higher catalytic activity of rGO to the redox reactions of H2O2 and hydrazine. The results suggest that rGO-modified electrodes are useful for constructing electrochemical sensors.

Original languageEnglish
Pages (from-to)1840-1850
Number of pages11
JournalMaterials
Volume6
Issue number5
DOIs
Publication statusPublished - 2013

Keywords

  • Electrodeposition
  • GC electrode
  • Graphene
  • Hydrazine
  • Hydrogen peroxide

ASJC Scopus subject areas

  • Materials Science(all)

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