Abstract
Application of an oxygen-depolarized cathode will contribute to energy saving in chlor-alkali electrolysis. For this purpose, the development of high-performance cathode with the best electrocatalyst is essential. Using bimetallic Pt-based alloy electrocatalysts including PtPd and PtAg carbon-supported in oxygen-depolarized cathode chlor-alkali cell has been shown to have the high cell performance. This study presents application of PtRu carbon supported electrocatalyst oxygen-depolarized cathode and performance comparison of cells with carbon-supported PtRu, PtPd and PtAg electrocatalysts cathodes using the same DSA-Cl2 anode. Results show that there are quite similarity between the effects of various factors on the caustic current efficiency (CCE) in a zero-gap oxygen-depolarized chlor-alkali cells employing carbon-supported PtPd, PtRu and PtAg electrocatalysts. Besides, it seems that the PtPd/C electrocatalyst cathode has relatively higher performance than the other cathodes with PtAg/C and PtRu/C electrocatalysts in zero-gap chlor-alkali cells.
Highlights
Chlorine as one of the most important bulk chemicals in the world is produced by the brine electrolysis
Results show that there are quite similarity between the effects of various factors on the caustic current efficiency (CCE) in a zero-gap oxygen-depolarized chlor-alkali cells employing carbon-supported PtPd, PtRu and PtAg electrocatalysts. It seems that the PtPd/C electrocatalyst cathode has relatively higher performance than the other cathodes with PtAg/C and PtRu/C electrocatalysts in zero-gap chlor-alkali cells
Due to harsh condition in saturated oxygen and concentrated caustic ofchlor-alkali membrane cell media, the oxygen-depolarized cathodes are more susceptible to performance loss than the conventional hydrogen-evolving cathodes
Summary
Chlorine as one of the most important bulk chemicals in the world is produced by the brine electrolysis. Replacing the conventional hydrogen-evolving cathode by oxygen-depolarized cathode in CA membrane cell reduced the cell voltage [1,2,3,4,5] and 30% energy consumption reduction at 4 kA·m–2 [4,5] and CO2 emission reduction i.e. global environment improvement. The conventional and advanced chlor-alkali cells carbon dioxide emissions are compared for a range of primary energy sources that could be used to generate power [6] (Figure 1). Due to harsh condition in saturated oxygen and concentrated caustic ofchlor-alkali membrane cell media, the oxygen-depolarized cathodes are more susceptible to performance loss than the conventional hydrogen-evolving cathodes. The employment of Pt-based alloy electrocatalysts including PtPd and PtAg carbon-supported in oxygen-depolarized chlor-alkali cathodes has been already reported [10,11]. The preparations of Pt-alloy electrocatalyst cathodes and their characterizations are described in brief
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