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- Title
Catalytic Reactivation of Industrial Oxygen Depolarized Cathodes by in situ Generation of Atomic Hydrogen.
- Authors
Öhl, Denis; Franzen, David; Paulisch, Melanie; Dieckhöfer, Stefan; Barwe, Stefan; Andronescu, Corina; Manke, Ingo; Turek, Thomas; Schuhmann, Wolfgang
- Abstract
Electrocatalytically active materials on the industrial as well as on the laboratory scale may suffer from chemical instability during operation, air exposure, or storage in the electrolyte. A strategy to recover the loss of electrocatalytic activity is presented. Oxygen‐depolarized cathodes (ODC), analogous to those that are utilized in industrial brine electrolysis, are analyzed: the catalytic activity of the electrodes upon storage (4 weeks) under industrial process conditions (30 wt % NaOH, without operation) diminishes. This phenomenon occurs as a consequence of surface oxidation and pore blockage, as revealed by scanning electron microscopy, focused ion beam milling, X‐ray photoelectron spectroscopy, and Raman spectroscopy. Potentiodynamic cycling of the oxidized electrodes to highly reductive potentials and the formation of "nascent" hydrogen re‐reduces the electrode material, ultimately recovering the former catalytic activity.
- Subjects
CATHODES; CARBON fixation; ATOMIC hydrogen
- Publication
ChemSusChem, 2019, Vol 12, Issue 12, p2732
- ISSN
1864-5631
- Publication type
Article
- DOI
10.1002/cssc.201900628