Hematite as an Electrocatalytic Marker for the Study of Archaeological Ceramic Clay bodies: A VIMP and SECM Study. Issue 2 (16th November 2021)

• Record Type: Journal Article
• Authors: Doménech‐Carbó, Antonio; Giannuzzi, Michele; Mangone, Annarosa; Giannossa, Lorena Carla; Di Turo, Francesca; Cofini, Elena; Doménech‐Carbó, María Teresa
• Is Part Of: ChemElectroChem. Volume 9:Issue 2(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2021-11-16
• Subjects: voltammetry -- hematite -- ceramic clays -- oxygen reduction reaction -- oxygen evolution reaction; Electrochemistry -- Periodicals; 541.37
• DOI: 10.1002/celc.202101197
• Languages: English
• ISSNs: 2196-0216

Abstract

Abstract: 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 °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. Abstract : Pot luck : The electrochemistry of clay body samples from Apulian red‐figured pottery involves hematite‐based electrocatalytic effects on the oxygen evolution and hydrogen evolution reaction processes.