Dual co-catalysts activated hematite nanorods with low turn-on potential and enhanced charge collection for efficient solar water oxidation

Maity, D and Pal, D and Karmakar, K and Rakshit, R and Khan, GG and Mandal, K (2022) Dual co-catalysts activated hematite nanorods with low turn-on potential and enhanced charge collection for efficient solar water oxidation. In: Nanotechnology, 33 (26).

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Abstract

Hematite (α-Fe2O3) photoanode suffers from significant photocarrier recombination and sluggish water oxidation kinetics for photoelectrochemical water splitting. To address these challenges, this work demonstrates the construction of dual co-catalysts modified Fe2O3 nanorods photoanode by strategically incorporating CoPi and Co(OH) x for photoelectrochemical water oxidation. The Fe2O3/CoPi/Co(OH) x nanorods photoanode exhibits the lowest ever turn-on potential of 0.4 V RHE (versus reversible hydrogen electrode) and a photocurrent density of 0.55 mA cm-2 at 1.23 V RHE, 358 higher than that of pristine Fe2O3 nanorods. The dual co-catalysts modification enhances the light-harvesting efficiency, surface photovoltage and hole transfer kinetics of the hybrid photoanode. The dual co-catalyst coupling also increases the carrier density and significantly reduces the depletion width (1.9 nm), resulting in improved conductivity and favorable band bending, boosting photogenerated hole transfer efficiency for water oxidation. © 2022 IOP Publishing Ltd.

Item Type:	Journal Article
Publication:	Nanotechnology
Publisher:	IOP Publishing Ltd
Additional Information:	The copyright for this article belongs to IOP Publishing Ltd
Keywords:	Catalysts; Cobalt compounds; Electrochemistry; Energy harvesting; Hematite; Hydrogen production; Oxidation, Charge collection; Co catalysts; Haematite; Hematite nanorods; Hole transfer; On potentials; Photo-anodes; Reversible hydrogen electrodes; Solar waters; Water oxidation, Nanorods
Department/Centre:	Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited:	19 May 2022 05:05
Last Modified:	19 May 2022 05:05
URI:	https://eprints.iisc.ac.in/id/eprint/72029

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