Abstract
The historical development, current status and future prospects of chlor-alkali electrolysis with oxygen depolarized cathodes (ODCs) are summarized. Over the last decades, membrane chlor-alkali technology has been optimized to such an extent that no substantial reduction of the energy demand can be expected from further process modifications. However, replacement of the hydrogen evolving cathodes in the classical membrane cells by ODCs allows for reduction of the cell voltage and correspondingly the energy consumption of up to 30%. This replacement requires the development of appropriate cathode materials and novel electrolysis cell designs. Due to their superior long-term stability, ODCs based on silver catalysts are very promising for oxygen reduction in concentrated NaOH solutions. Finite-gap falling film cells appear to be the technically most mature design among the several ODC electrolysis cells that have been investigated.
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Part of this study was funded by the German Ministry of Education and Research (BMBF) under the klimazwei research programme.
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Moussallem, I., Jörissen, J., Kunz, U. et al. Chlor-alkali electrolysis with oxygen depolarized cathodes: history, present status and future prospects. J Appl Electrochem 38, 1177–1194 (2008). https://doi.org/10.1007/s10800-008-9556-9
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DOI: https://doi.org/10.1007/s10800-008-9556-9