6533b827fe1ef96bd1286776
RESEARCH PRODUCT
Hematite as an Electrocatalytic Marker for the Study of Archaeological Ceramic Clay bodies: A VIMP and SECM Study**
Michele GiannuzziAnnarosa MangoneElena CofiniFrancesca Di TuroMaría Teresa Doménech-carbóAntonio Doménech-carbóLorena Carla Giannossasubject
Materials scienceOxygen evolution reactionOxygen evolutionHematiteHematiteCeramic claysCatalysisOxygen reduction reactionChemical engineeringvisual_artPINTURAElectrochemistryvisual_art.visual_art_mediumOxygen reduction reactionVoltammetryCeramicVoltammetrydescription
[EN] The electrocatalytic effect exerted by hematite, a ubiquitous component of clay bodies, on the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) can be used to acquire information on archaeological ceramics. The solid-state voltammetric response of different hematite and ochre specimens, accompanied by SECM analysis in contact with 0.10 M HCl aqueous solution, is described. In air-saturated solutions, catalytic effects on the ORR and OER are accompanied by Fe(III)/Fe(II) and Fe(IV)/Fe(III) redox reactions. Such processes are conditioned by a variety of factors, the hydroxylation degree of the mineral surfaces being particularly influential, and exhibit significant variations upon heating the specimens between 300 and 900 degrees C. Voltammetric measurements carried out on a set of archaeological samples of Apulian red-figured pottery dated back within 5(th) and 4(th) centuries BCE permit to obtain site-characteristic voltammetric profiles.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2022-01-27 |