The impact of process parameters on caustic current efficiency and peroxide-tohydroxide molar ratio are studied in the advanced chlor-alkali membrane cell, using an oxygen-depolarized carbon-supported PtPd electrocatalyst cathode. The experimental results indicate the caustic current efficiency (CCE) improvement by decreasing peroxide generation rate as the temperature and oxygen flow rate increase. The performances of the carbon-supported PtPd and the ESNS carbonsupported Pt electrocatalyst layer cathodes are compared. The results show a new oxygen-depolarized cathode with PtPd/C electrocatalyst layer in an advanced chlor-alkali cell which is more economical, as well as a comparison of its performance against a commercial ESNS® cathode.
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-Cl 2 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.
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