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

Sergi Garcia-Segura; Francesc Centellas; Enric Brillas

doi:10.1021/jp305493g

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

Sergi Garcia-Segura, Francesc Centellas, Enric Brillas

Research output: Contribution to journal › Article › peer-review

39 Scopus citations

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 language	English (US)
Pages (from-to)	15500-15504
Number of pages	5
Journal	Journal of Physical Chemistry C
Volume	116
Issue number	29
DOIs	https://doi.org/10.1021/jp305493g
State	Published - Jul 26 2012
Externally published	Yes

ASJC Scopus subject areas

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

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

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.",

author = "Sergi Garcia-Segura and Francesc Centellas and Enric Brillas",

year = "2012",

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doi = "10.1021/jp305493g",

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T1 - Unprecedented electrochemiluminescence of luminol on a boron-doped diamond thin-film anode. Enhancement by electrogenerated superoxide radical anion

AU - Garcia-Segura, Sergi

AU - Centellas, Francesc

AU - Brillas, Enric

PY - 2012/7/26

Y1 - 2012/7/26

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.

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

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