Online monitoring of electrochemical carbon corrosion in alkaline electrolytes by differential electrochemical mass spectrometry.

07:00 EST 8th November 2019 | BioPortfolio

Summary of "Online monitoring of electrochemical carbon corrosion in alkaline electrolytes by differential electrochemical mass spectrometry."

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.


Journal Details

This article was published in the following journal.

Name: Angewandte Chemie (International ed. in English)
ISSN: 1521-3773


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