Electrogenerated Chemiluminescence by in Situ Production of Coreactant Hydrogen Peroxide in Carbonate Aqueous Solution at a Boron-Doped Diamond Electrode

Irkham, Andrea Fiorani, Giovanni Valenti, Naoki Kamoshida, Francesco Paolucci, Yasuaki Einaga

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

An electrogenerated chemiluminescence (ECL) system by in situ coreactant production, where Ru(bpy)3 2+ emission is generated at a boron-doped diamond (BDD) electrode, is presented. The system takes advantage of the unique properties of BDD to promote oxidation of carbonate (CO3 2-) into peroxydicarbonate (C2O6 2-), which further reacts with water to form hydrogen peroxide (H2O2), which acts as a coreactant for Ru(bpy)3 2+ ECL. Investigation of the mechanism reveals that ECL emission is triggered by the reduction of H2O2 to hydroxyl radicals (OH), which later react with the reduced Ru(bpy)3 + molecules to form excited states, followed by light emission. The ECL signal was found to increase with the concentration of CO3 2- therefore, with the concentration of electrogenerated H2O2, although at the same time, higher concentrations of H2O2 can quench the ECL emission, resulting in a decrease in intensity. The carbonate concentration, pH, and oxidation parameters, such as potential and time, were optimized to find the best emission conditions.

Original languageEnglish
Pages (from-to)1518-1525
Number of pages8
JournalJournal of the American Chemical Society
Volume142
Issue number3
DOIs
Publication statusPublished - 2020 Jan 22

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

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