Catalytic Reactivation of Industrial Oxygen Depolarized Cathodes by in situ Generation of Atomic Hydrogen
| Autor: | Ingo Manke, Corina Andronescu, Wolfgang Schuhmann, Melanie Paulisch, Stefan Dieckhöfer, Denis Öhl, Thomas Turek, David Franzen, Stefan Barwe |
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| Rok vydání: | 2019 |
| Předmět: |
Electrolysis
Materials science Hydrogen Gas diffusion electrode Scanning electron microscope General Chemical Engineering Chemie chemistry.chemical_element 02 engineering and technology Electrolyte 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Focused ion beam 0104 chemical sciences law.invention Catalysis General Energy chemistry Chemical engineering X-ray photoelectron spectroscopy law Environmental Chemistry General Materials Science 0210 nano-technology |
| Zdroj: | ChemSusChem. 12:2732-2739 |
| ISSN: | 1864-564X 1864-5631 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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