Details

Autor(en) / Beteiligte

• Möller, Sandra
• Barwe, Stefan
• Masa, Justus
• Wintrich, Daniela
• Seisel, Sabine
• Baltruschat, Helmut
• Schuhmann, Wolfgang

Titel

Online Monitoring of Electrochemical Carbon Corrosion in Alkaline Electrolytes by Differential Electrochemical Mass Spectrometry

Ist Teil von

• Angewandte Chemie (International ed.), 2020-01, Vol.59 (4), p.1585-1589

Auflage

International ed. in English

Ort / Verlag

Germany: Wiley Subscription Services, Inc

Erscheinungsjahr

2020

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Carbon corrosion at high anodic potentials is a major source of instability, especially in acidic electrolytes and impairs the long‐term functionality of electrodes. In‐depth investigation of carbon corrosion in alkaline environment by means of differential electrochemical mass spectrometry (DEMS) is prevented by the conversion of CO2 into CO32−. We report the adaptation of a DEMS system for online CO2 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 CO32− as CO2 in front of the DEMS membrane and its subsequent detection by mass spectrometry. DEMS studies of a carbon‐supported nickel boride (NixB/C) catalyst and Vulcan XC 72 at high anodic potentials suggest protection of carbon in the presence of highly active oxygen evolution electrocatalysts. Most importantly, carbon corrosion is decreased in alkaline solution. Caught in the act: Direct detection of CO2 as a marker for carbon oxidation in alkaline electrolytes is now possible using a novel DEMS cell (DEMS=differential electrochemical mass spectrometry) and a specially designed experimental procedure. A high oxygen evolution reaction (OER) catalyst loading on carbon suppresses carbon corrosion in alkaline media.