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Cathodic electrochemiluminescent behavior of luminol at nafion–nano‐TiO 2 modified glassy carbon electrode
Author(s) -
Ye Ruihong,
Huang Lizhang,
Qiu Bin,
Song Ziwang,
Lin Zhenyu,
Chen Guonan
Publication year - 2010
Publication title -
luminescence
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.428
H-Index - 45
eISSN - 1522-7243
pISSN - 1522-7235
DOI - 10.1002/bio.1265
Subject(s) - electrochemiluminescence , luminol , nafion , detection limit , electrode , inorganic chemistry , chemistry , oxygen , glassy carbon , analytical chemistry (journal) , materials science , electrochemistry , cyclic voltammetry , chromatography , organic chemistry
The electrochemiluminescence (ECL) behavior of luminol on a nafion–nano‐TiO 2 modified glassy carbon electrode (nafion–nano‐TiO 2 GCE) was studied. Two ECL peaks (ECL‐1 and ECL‐2) were found during cathodic potential scanning. ECL‐1 at ca −0.4 V (vs AgAgCl reference electrode) came from the reaction between luminol and active oxygen anion produced at the GCE surface directly, while ECL‐2 at ca − 0.9 V (vs AgAgCl reference electrode) came from the reaction between luminol and the active oxygen anion catalyzed by TiO 2. The possible mechanism for the generation of both ECL peaks has been proposed. The reproducibility of the ECL intensities on nafion–nano‐TiO 2 GCE at ECL‐1 and ECL‐2 was good, with relative standard deviations ( n = 10) of 4.3 and 1.3%, respectively. The ECL‐2 generated at the nafion–nano‐TiO 2 GCE surface was further developed to detect the dissolved oxygen, and a detection limit of 0.02 mg/L was achieved. The proposed method was applied to detect dissolved oxygen in water with satisfactory result. Copyright © 2010 John Wiley & Sons, Ltd.