Ir-phosphate cocatalyst for photoelectrochemical water oxidation using alpha-Fe2O3

Irshad, Ahamed and Munichandraiah, Nookala (2017) Ir-phosphate cocatalyst for photoelectrochemical water oxidation using alpha-Fe2O3. In: RSC ADVANCES, 7 (35). pp. 21430-21438.

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Abstract

alpha-Fe2O3 is an ideal photoanode for solar water oxidation owing to its visible light absorbing capability, suitable valence band position, low cost, high abundance, non-toxicity and eco-friendliness. However, the reported efficiencies are very low due to the poor kinetics of water oxidation by photogenerated holes on alpha-Fe2O3. In the present study, an alpha-Fe2O3 electrode is obtained by heating a film of Fe which is prepared by the electrochemical reduction of Fe2+ ions. Film thickness and calcination temperature are carefully optimized to get a maximum photoresponse in neutral phosphate solution. In order to improve the water oxidation kinetics and reduce the charge carrier recombination, an iridium-phosphate (Ir-Pi) catalyst is electrodeposited on the surface of alpha-Fe2O3. Ir-Pi is found to reduce the OER onset potential by 350 mV, and enhances the photocurrent density by 3 times at 1.23 V vs. RHE.

Item Type:	Journal Article
Publication:	RSC ADVANCES
Additional Information:	Copy right for this article belongs to the ROYAL SOC CHEMISTRY, THOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLAND
Department/Centre:	Division of Chemical Sciences > Inorganic & Physical Chemistry
Date Deposited:	25 May 2017 10:10
Last Modified:	25 May 2017 10:10
URI:	http://eprints.iisc.ac.in/id/eprint/57075

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