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Development of high-performance silver-based gas-diffusion electrodes for chlor-alkali electrolysis with oxygen depolarized cathodes

Moussallem, Imad and Pinnow, Stefan and Wagner, Norbert and Turek, Thomas (2012) Development of high-performance silver-based gas-diffusion electrodes for chlor-alkali electrolysis with oxygen depolarized cathodes. Chemical Engineering and Processing (52), pp. 125-131. Elsevier. DOI: 10.1016/j.cep.2011.11.003 ISSN 0255-2701

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Abstract

Silver-based gas-diffusion electrodes were prepared, characterized and tested during chlor-alkali electrolysis with oxygen depolarized cathodes. Spraying of aqueous suspensions containing silver catalyst particles, a PTFE suspension, a surfactant and an organic thickening agent on nickel nets followed by drying, hot-pressing and sintering allowed for the preparation of highly active electrodes. Electrodes obtained from the most suitable catalyst SF9ED (Ferro) were systematically investigated. The best electrodes contain 97–98 wt.% silver 2–3 wt.% PTFE, are hot-pressed at ca. 130 °C with moderate pressure and subsequently sintered at temperatures around 340 °C. For these electrodes, half cell potentials of ca. 650 mV vs. RHE corresponding to electrolysis cell voltages of ca. 2.17 V at current densities of 4 kA/m2 were obtained. Both half cell and electrolysis cell voltages were found to be reproducible within about ±30 mV during repeated measurements using electrodes from different batches. While the Ag/PTFE loading had little influence on the observed voltages in the range studied (100–300 mg/cm2), loadings of at least 200 mg/cm2 are recommended to prevent leakage of NaOH electrolyte and to allow for operation under oxygen overpressures of more than 100 mbar without breakthrough of gas to the electrolyte.

Item URL in elib:https://elib.dlr.de/71823/
Document Type:Article
Title:Development of high-performance silver-based gas-diffusion electrodes for chlor-alkali electrolysis with oxygen depolarized cathodes
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Moussallem, Imadmoussallem (at) icvt.tu.clausthal.deUNSPECIFIED
Pinnow, Stefanstefan.pinnow (at) thyssenkrupp.comUNSPECIFIED
Wagner, NorbertTTUNSPECIFIED
Turek, Thomasturek (at) icvt.tu-clausthal.deUNSPECIFIED
Date:February 2012
Journal or Publication Title:Chemical Engineering and Processing
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
DOI :10.1016/j.cep.2011.11.003
Page Range:pp. 125-131
Publisher:Elsevier
ISSN:0255-2701
Status:Published
Keywords:Chlor-Alkali-Elektrolyse, Gas-Diffusionelektrode, Sauerstoffverzehrkathode, Silberkatalysator
HGF - Research field:Energy
HGF - Program:Efficient Energy Conversion (old)
HGF - Program Themes:E EV - Energy process technology (old)
DLR - Research area:Energy
DLR - Program:E EV - Energy process technology
DLR - Research theme (Project):E - Elektrochemische Prozesse (old)
Location: Stuttgart
Institutes and Institutions:Institute of Engineering Thermodynamics > Electrochemical Energy Technology
Deposited By: Wagner, Dr.rer.nat. Norbert
Deposited On:07 Feb 2012 15:15
Last Modified:26 Mar 2013 13:33

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