PubMed Health⌕ Search
Home/Archive/PubMed

PubMed · 2400105

Microring electrode/optical waveguide: electrochemical characterization and application to electrogenerated chemiluminescence.

L S Kuhn·A Weber·S G Weber
View original source ↗Export metadata ↓

Abstract

A novel optoelectrochemical microprobe has been developed that allows the combination of optical and electrochemical methods in a very small system. The key element is a gold-coated optical fiber polished to a flat surface, such that the gold forms a microring electrode surrounding the optical fiber. The electrochemistry of the microring has been characterized; cyclic voltammetric and chronoamperometric limiting currents agree well with published theoretical treatments. The probe has also been used for electrogenerated chemiluminescence with tris(2,2'-bypyridine)ruthenium(II) with persulfate in 50:50 MeCN:H2O. Detection limits of 4.3 X 10(-8) M Ru(bpy)3(2+) have been obtained.

Explore related subjects

ElectrochemistryElectrodesLuminescent MeasurementsJournal ArticleResearch Support, U.S. Gov't, P.H.S.

Keep this discovery

Explore connections, maps & timelines

BibTeXRIS

L S Kuhn, A Weber, S G Weber. 1990-08-01. Microring electrode/optical waveguide: electrochemical characterization and application to electrogenerated chemiluminescence.. https://doi.org/10.1021/ac00214a019

Cite the original work for its findings. Save a collection to share your selection of sources.

KEEP EXPLORING

Related citations

PubMed2007

Advanced oxidation processes for the treatment of olive-oil mills wastewater.

In this work, the treatment of an actual industrial waste with three advanced oxidation processes (AOP) has been studied: conductive-diamond electrooxidation (CDEO), ozonation and Fenton oxidation. The wastewater comes from olive-oil mills (OMW) and contains a COD of nearly 3000 mg dm(-3). CDEO allowed achieving the complete mineralization of the waste with high current efficiencies. Likewise, both ozonation and Fenton oxidation were able to treat the wastes, but they obtained very different results in terms of efficiency and mineralization. The accumulation of oxidation-refractory compounds as final products excludes the use of ozonation and Fenton oxidation as a sole treatment technology. This confirms that besides the hydroxyl-radical mediated oxidation, CDEO combines other important oxidation processes such as the direct electro-oxidation on the diamond surface and the oxidation mediated by other electrochemically formed compounds generated on this electrode.

Electrochemistry↗
PubMed2007

Electrosynthesis of hydrogen peroxide via the reduction of oxygen assisted by power ultrasound.

The electrosynthesis of hydrogen peroxide using the oxygen reduction reaction has been studied in the absence and presence of power ultrasound in a non-optimized sono-electrochemical flow reactor (20 cm cathodic compartment length with 6.5 cm inner diameter) with reticulated vitreous glassy carbon electrode (30 x 40 x 10 mm, 10 ppi, 7 cm(2)cm(-3)) as the cathode. The effect of several electrochemical operational variables (pH, volumetric flow, potential) and of the sono-electrochemical parameters (ultrasound amplitude and horn-to-electrode distance) on the cumulative concentration of hydrogen peroxide and current efficiency of the electrosynthesis process have been explored. The application of power ultrasound was found to increase both the cumulative concentration of hydrogen peroxide and the current efficiency. The application of ultrasound is therefore a promising approach to the increased efficiency of production of hydrogen peroxide by electrosynthesis, even in the solutions of lower pH (<12). The results demonstrate the feasibility of at-site-of-use green synthesis of hydrogen peroxide.

Electrochemistry↗