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Carbon materials find ubiquitous use as electrodes, cata-lysts or catalyst supports in a myriad of electrochemical applications. However, carbon corrosion at high anodic potentials is known to be a major source of instability especially in acidic electrolytes and impairs long-term functionality of electrodes. Changing reaction kinetics with changing pH values of the electrolyte require in-depth investigation of carbon corrosion also for alkaline environments. Evidently, the imme-diate conversion of CO 2 to CO 3 2- prevents straight-forward investiga-tion of carbon corrosion by means of differential electrochemical mass spectrometry (DEMS) in alkaline media. We report adaptation of a DEMS system to allow online CO 2 detection as the product of carbon corrosion in alkaline electrolytes. A new cell design allows for in-situ acidification of the electrolyte to release initially dissolved CO 3 2- as CO 2 in front of the DEMS membrane and its subsequent detection by mass spectrometry. DEMS studies of a carbon-supported nickel boride (Ni x B/C) catalyst and pure Vulcan XC 72 at high anodic poten-tials suggest a protection of carbon by the presence of highly-active oxygen evolution electrocatalysts. Most importantly, carbon corrosion is substantially decreased in alk-line solution which may provide new aspects for the application of carbon materials in electrolysers or fuel cells.
This article was published in the following journal.
Name: Angewandte Chemie (International ed. in English)
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An electrochemical technique for measuring the current that flows in solution as a function of an applied voltage. The observed polarographic wave, resulting from the electrochemical response, depends on the way voltage is applied (linear sweep or differential pulse) and the type of electrode used. Usually a mercury drop electrode is used.
A scanning probe microscopy technique that uses an ultramicroelectrode as the scanning probe that simultaneously records changes in electrochemical potential as it scans thereby creating topographical images with localized electrochemical information.
Substances that dissociate into two or more ions, to some extent, in water. Solutions of electrolytes thus conduct an electric current and can be decomposed by it (ELECTROLYSIS). (Grant & Hackh's Chemical Dictionary, 5th ed)
A slightly alkaline secretion of the endocervical glands. The consistency and amount are dependent on the physiological hormone changes in the menstrual cycle. It contains the glycoprotein mucin, amino acids, sugar, enzymes, and electrolytes, with a water content up to 90%. The mucus is a useful protection against the ascent of bacteria and sperm into the uterus. (From Dictionary of Obstetrics and Gynecology, 1988)
Physiologic or biochemical monitoring of the fetus. It is usually done during LABOR, OBSTETRIC and may be performed in conjunction with the monitoring of uterine activity. It may also be performed prenatally as when the mother is undergoing surgery.