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An alternative approach to selective sea water oxidation for hydrogen production

Balaji, Rengarajan and Kannan, Balasingam Suresh and Lakshmi, Jothinathan and Senthil, Natarajan and Vasudevan, Subramanyan and Sozhan, Ganapathy and Shukla, Ashok Kumar and Ravichandran, Subbiah (2009) An alternative approach to selective sea water oxidation for hydrogen production. In: Electrochemistry Communications, 11 (8). pp. 1700-1702.

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Abstract

Sea water electrolysis is one of the promising ways to produce hydrogen since it is available in plentiful supply on the earth. However, in sea water electrolysis toxic chlorine evolution is the preferred reaction over oxygen evolution at the anode. In this work, research has been focused on the development of electrode materials with a high selectivity for oxygen evolution over chlorine evolution. Selective oxidation in sea water electrolysis has been demonstrated by using a cation-selective polymer. We have used a perm-selective membrane (Nafion®), which electrostatically repels chloride ions (Cl−) to the electrode surface and thereby enhances oxygen evolution at the anode. The efficiency and behaviour of the electrode have been characterized by means of anode current efficiency and polarization studies. The surface morphology of the electrode has been characterized by using a scanning electron microscope (SEM). The results suggest that nearly 100% oxygen evolution efficiency could be achieved when using an IrO2/Ti electrode surface-modified by a perm-selective polymer.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to Elsevier Science.
Keywords: Selective water oxidation;Hydrogen;Oxygen evolution;Chlorine evolution;Perm-selective membrane.
Department/Centre: Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited: 29 Sep 2009 06:26
Last Modified: 19 Sep 2010 05:45
URI: http://eprints.iisc.ernet.in/id/eprint/23280

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