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Electrochemical analysis of nanostructured iron oxides using cyclic voltammetry and scanning electrochemical microscopy

Electrochemical analysis of nanostructured iron oxides using cyclic voltammetry and scanning electrochemical microscopy
Electrochemical analysis of nanostructured iron oxides using cyclic voltammetry and scanning electrochemical microscopy
Iron oxides in general and especially hematite, ?-Fe2O3, have become promising materials for the alkaline water electrolysis and photoelectrochemical water splitting, respectively. In the present study electrocatalytic electrodes with a thin film of ?-Fe2O3 and with vertically aligned ?-Fe2O3 nanowires were prepared. Cyclic voltammograms of the ?-Fe2O3 nanowires revealed differences including a series of three unreported cathodic signals when compared to previously published voltammograms for polycrystalline iron oxides. The generation-collection mode of scanning electrochemical microscopy (SECM) using nanostructured Pt microdisc probes was exploited to detect soluble reaction products formed at the voltammetric peaks of the ?-Fe2O3 electrode. SECM tip-substrate voltammetry unexpectedly showed that the reduction of FeVI to FeIII on the cathodic sweep is accompanied by significant O2 evolution.
0013-4686
Bülter, Heinz
7c405ca8-4c88-4fc0-a8ed-49e5c11cb70b
Denuault, Guy
5c76e69f-e04e-4be5-83c5-e729887ffd4e
Mátéfi-Tempfli, Stefan
7a198abe-6db7-4006-b94c-126eb3efb876
Mátéfi-Tempfli, Mária
6036af10-2877-4f5c-b1b2-0f9cb583394b
Dosche, Carsten
e6cc5733-ed83-4a7d-b91c-7284ed268955
Wittstock, Gunther
7ae82c46-b390-4942-9b2b-dc94ef212adb
Bülter, Heinz
7c405ca8-4c88-4fc0-a8ed-49e5c11cb70b
Denuault, Guy
5c76e69f-e04e-4be5-83c5-e729887ffd4e
Mátéfi-Tempfli, Stefan
7a198abe-6db7-4006-b94c-126eb3efb876
Mátéfi-Tempfli, Mária
6036af10-2877-4f5c-b1b2-0f9cb583394b
Dosche, Carsten
e6cc5733-ed83-4a7d-b91c-7284ed268955
Wittstock, Gunther
7ae82c46-b390-4942-9b2b-dc94ef212adb

Bülter, Heinz, Denuault, Guy, Mátéfi-Tempfli, Stefan, Mátéfi-Tempfli, Mária, Dosche, Carsten and Wittstock, Gunther (2016) Electrochemical analysis of nanostructured iron oxides using cyclic voltammetry and scanning electrochemical microscopy. Electrochimica Acta. (doi:10.1016/j.electacta.2016.11.108).

Record type: Article

Abstract

Iron oxides in general and especially hematite, ?-Fe2O3, have become promising materials for the alkaline water electrolysis and photoelectrochemical water splitting, respectively. In the present study electrocatalytic electrodes with a thin film of ?-Fe2O3 and with vertically aligned ?-Fe2O3 nanowires were prepared. Cyclic voltammograms of the ?-Fe2O3 nanowires revealed differences including a series of three unreported cathodic signals when compared to previously published voltammograms for polycrystalline iron oxides. The generation-collection mode of scanning electrochemical microscopy (SECM) using nanostructured Pt microdisc probes was exploited to detect soluble reaction products formed at the voltammetric peaks of the ?-Fe2O3 electrode. SECM tip-substrate voltammetry unexpectedly showed that the reduction of FeVI to FeIII on the cathodic sweep is accompanied by significant O2 evolution.

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Accepted/In Press date: 18 November 2016
e-pub ahead of print date: 19 November 2016
Organisations: Faculty of Natural and Environmental Sciences

Identifiers

Local EPrints ID: 403546
URI: https://eprints.soton.ac.uk/id/eprint/403546
ISSN: 0013-4686
PURE UUID: ae4f9b96-0c55-4ad6-8a63-2b24d0748084
ORCID for Guy Denuault: ORCID iD orcid.org/0000-0002-8630-9492

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Date deposited: 05 Dec 2016 11:59
Last modified: 20 Jul 2019 01:22

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Contributors

Author: Heinz Bülter
Author: Guy Denuault ORCID iD
Author: Stefan Mátéfi-Tempfli
Author: Mária Mátéfi-Tempfli
Author: Carsten Dosche
Author: Gunther Wittstock

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