Abstract
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 CO3 2−. 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 CO3 2− 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.
Highlights
Carbon corrosion at high anodic potentials is a major source of instability, especially in acidic electrolytes and impairs the long-term functionality of electrodes
We report the adaptation of a differential electrochemical mass spectrometry (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 CO32À as CO2 in front of the DEMS membrane and its subsequent detection by mass spectrometry
Summary
Carbon corrosion at high anodic potentials is a major source of instability, especially in acidic electrolytes and impairs the long-term functionality of electrodes. The current is the sum of iOER and iC,Ox and it is supposed that a highly active OER catalyst is protecting the carbon support against corrosion (a).
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