TY - JOUR
T1 - Anthraquinone-modified electrodes, preparations and characterizations
AU - Yeh, Shang Yu
AU - Wang, Chong Mou
PY - 2006/7/15
Y1 - 2006/7/15
N2 - To provide better understanding of the potential of quinones in the reduction of oxygen in aerated solutions, we prepared quinone-modified electrodes based on 1,2- and 1,4-diaminoanthraquinones (o-DAAQ and p-DAAQ). Electrochemical characterizations with cyclic voltammetry (CV), electrochemical impedance analysis (EIS), and electrochemical-quartz-crystal microbalance analysis (EQCM) suggest that anodic polymerization and surface attachment are useful approaches for this purpose. Although the morphologies revealed from the resulting electrodes were different, the electrodes prepared in these ways showed similar catalytic effects on the reduction of oxygen in aerated solutions. Attenuated total reflectance infrared spectral analysis (ATR-IR) suggested that the quinone moieties in the polymeric o-DAAQ are likely to lie on the electrode. In contrast, the surface-attachment approach could lead the immobilized p-DAAQ to be randomly distributed on the incorporated electrode. Chemical luminescent assays based on luminol showed that superoxide anion radical could be converted from oxygen at a greater speed with the prepared quinone-modified electrodes. These results indicate that quinone is an effective mediator for the reduction of oxygen in aerated solutions.
AB - To provide better understanding of the potential of quinones in the reduction of oxygen in aerated solutions, we prepared quinone-modified electrodes based on 1,2- and 1,4-diaminoanthraquinones (o-DAAQ and p-DAAQ). Electrochemical characterizations with cyclic voltammetry (CV), electrochemical impedance analysis (EIS), and electrochemical-quartz-crystal microbalance analysis (EQCM) suggest that anodic polymerization and surface attachment are useful approaches for this purpose. Although the morphologies revealed from the resulting electrodes were different, the electrodes prepared in these ways showed similar catalytic effects on the reduction of oxygen in aerated solutions. Attenuated total reflectance infrared spectral analysis (ATR-IR) suggested that the quinone moieties in the polymeric o-DAAQ are likely to lie on the electrode. In contrast, the surface-attachment approach could lead the immobilized p-DAAQ to be randomly distributed on the incorporated electrode. Chemical luminescent assays based on luminol showed that superoxide anion radical could be converted from oxygen at a greater speed with the prepared quinone-modified electrodes. These results indicate that quinone is an effective mediator for the reduction of oxygen in aerated solutions.
KW - Chemically modified electrode
KW - Oxygen reduction
KW - Quinone
KW - Superoxide anion radical
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U2 - 10.1016/j.jelechem.2006.04.027
DO - 10.1016/j.jelechem.2006.04.027
M3 - Article
AN - SCOPUS:33745348268
SN - 1572-6657
VL - 592
SP - 131
EP - 138
JO - Journal of Electroanalytical Chemistry
JF - Journal of Electroanalytical Chemistry
IS - 2
ER -