Insights into Improving Photoelectrochemical Water-Splitting Performance Using Hematite Anode

Devi, HR and Ong, BC and Zhao, X and Dong, Z and Nanda, KK and Chen, Z (2021) Insights into Improving Photoelectrochemical Water-Splitting Performance Using Hematite Anode. In: Energy Technology .

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Abstract

Designing an efficient photoanode is of great importance for photoassisted solar water splitting. Herein, a series of modifications to a nanorod structure hematite, to be used as anode for photoelectrochemical (PEC) water-splitting reactions is designed. Ti doping, oxygen vacancy formation by N2 treatment, TiO2 passivation, and FeOOH cocatalyst decoration are explored for their roles and contributions to the improvement of the PEC water oxidation performance. It is found that Ti doping and N2 treatment can greatly increase the charge carrier density, which has boosted the photocurrent. TiO2 passivation enhances the photovoltage, resulting in a cathodic shift in the onset potential (�170 mV with respect to prepassivation). Further, the FeOOH cocatalyst decoration improves the reaction kinetics, thereby improving the overall photoassisted water oxidation performance. © 2021 Wiley-VCH GmbH.

Item Type:	Journal Article
Publication:	Energy Technology
Publisher:	John Wiley and Sons Inc
Additional Information:	The copyright for this article belongs to John Wiley and Sons Inc
Keywords:	Anodes; Carrier concentration; Hematite; Nanorods; Passivation; Photocurrents; Photoelectrochemical cells; Reaction kinetics; Titanium; Titanium dioxide, Cathodic shifts; Onset potential; Photoelectrochemical water splitting; Photoelectrochemicals; Solar water splitting; Vacancy formation; Water oxidation; Water splitting reactions, Nitrogen compounds
Department/Centre:	Division of Chemical Sciences > Materials Research Centre
Date Deposited:	21 Nov 2021 16:26
Last Modified:	21 Nov 2021 16:26
URI:	http://eprints.iisc.ac.in/id/eprint/69916

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