Unprecedented electrochemiluminescence of luminol on a boron-doped diamond thin-film anode. Enhancement by electrogenerated superoxide radical anion

Sergio GARCIA SEGURA, Francesc Centellas, Enric Brillas

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

Electrochemiluminescence (ECL) of 0.01 M luminol in NaOH medium of pH 12.0 on a boron-doped diamond (BDD) thin-film anode was studied in the absence and presence of H 2O 2. Here we show a new characteristic property of BDD allowing light emission in a wide potential range of 0.5-5.0 V vs Ag|AgCl, KCl(sat.), a behavior not observed for other anodes. Maximum ECL intensity was found at 2.2-2.8 V without H 2O 2, which became 63 times more intense after adding 0.05 M H 2O 2. The strong enhancement of ECL in the presence of H 2O 2 is attributed to the larger production of emitter 3-aminophthalate dianion, formed by selective nucleophilic attack of superoxide radical anion (O 2 ·-) to the radical electrogenerated from one-electron oxidation of the monoanionic form of luminol. Linear sweep voltammetry showed that ·OH was not generated from OH - oxidation, whereas O 2 ·- can be produced from HO 2 - oxidation. The performance of O 2 ·- in ECL was confirmed by p-benzoquinone quenching.

Original languageEnglish (US)
Pages (from-to)15500-15504
Number of pages5
JournalJournal of Physical Chemistry C
Volume116
Issue number29
DOIs
StatePublished - Jul 26 2012
Externally publishedYes

Fingerprint

Luminol
Boron
inorganic peroxides
Diamond films
Superoxides
Anions
Anodes
boron
anodes
Negative ions
diamonds
anions
Thin films
Oxidation
oxidation
augmentation
thin films
Diamond
Light emission
quinones

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

Cite this

Unprecedented electrochemiluminescence of luminol on a boron-doped diamond thin-film anode. Enhancement by electrogenerated superoxide radical anion. / GARCIA SEGURA, Sergio; Centellas, Francesc; Brillas, Enric.

In: Journal of Physical Chemistry C, Vol. 116, No. 29, 26.07.2012, p. 15500-15504.

Research output: Contribution to journalArticle

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AU - Brillas, Enric

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N2 - Electrochemiluminescence (ECL) of 0.01 M luminol in NaOH medium of pH 12.0 on a boron-doped diamond (BDD) thin-film anode was studied in the absence and presence of H 2O 2. Here we show a new characteristic property of BDD allowing light emission in a wide potential range of 0.5-5.0 V vs Ag|AgCl, KCl(sat.), a behavior not observed for other anodes. Maximum ECL intensity was found at 2.2-2.8 V without H 2O 2, which became 63 times more intense after adding 0.05 M H 2O 2. The strong enhancement of ECL in the presence of H 2O 2 is attributed to the larger production of emitter 3-aminophthalate dianion, formed by selective nucleophilic attack of superoxide radical anion (O 2 ·-) to the radical electrogenerated from one-electron oxidation of the monoanionic form of luminol. Linear sweep voltammetry showed that ·OH was not generated from OH - oxidation, whereas O 2 ·- can be produced from HO 2 - oxidation. The performance of O 2 ·- in ECL was confirmed by p-benzoquinone quenching.

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