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High Catalytic Activity of Amorphous Ir-Pi for Oxygen Evolution Reaction

Irshad, Ahamed and Munichandraiah, Nookala (2015) High Catalytic Activity of Amorphous Ir-Pi for Oxygen Evolution Reaction. In: ACS APPLIED MATERIALS & INTERFACES, 7 (29). pp. 15765-15776.

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Official URL: http://dx.doi.org/10.1021/acsami.5b02601


Large-scale production of hydrogen gas by water electrolysis is hindered by the sluggish kinetics of oxygen evolution reaction (OER) at the anode. The development of a highly active and stable catalyst for OER is a challenging task. Electrochemically prepared amorphous metal-based catalysts have gained wide attention after the recent discovery of a cnbalt-phosphate (Co-Pi) catalyst: Herein, an amorphous iridium-phosphate (Ir-Pi) is investigated as an oxygen evolution catalyst. The catalyst is prepared by the anodic polarization of carbon paper electrodes in neutral phosphate buffer solutions containing IrCl3. The Ir-Pi film deposited on the substrate has significant amounts of phosphate and It centers in an oxidation state higher than +4. Phosphate plays a significant role in the deposition of the catalyst and also in its activity toward OER. The onset potential of OER on the Ir-Pi is about 150 mV lower in comparison with the Co-Pi under identical experimental conditions. Thus, Ir-Pi is a promising catalyst for electrochemical oxidation of water.

Item Type: Journal Article
Additional Information: Copy right for this article belongs to the AMER CHEMICAL SOC, 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
Keywords: Ir-Pi catalyst; electrochemical deposition; water oxidation; electrolysis of water; phosphate buffer; hydrogen generation; amorphous catalysts
Department/Centre: Division of Chemical Sciences > Inorganic & Physical Chemistry
Date Deposited: 03 Sep 2015 05:58
Last Modified: 03 Sep 2015 05:58
URI: http://eprints.iisc.ac.in/id/eprint/52290

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