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Electrochemical Detection of High Oxidation States of Chromium( IV and V ) in Chromium‐Doped Cassiterite and Tin‐Sphene Ceramic Pigmenting Systems
Author(s) -
Doménech Antonio,
Torres Francisco Jose,
Ruiz de Sola Esther,
Alarcón Javier
Publication year - 2006
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.200500775
Subject(s) - cassiterite , chemistry , tin , chromium , electrochemistry , ceramic , inorganic chemistry , doping , ion , redox , electrode , materials science , organic chemistry , optoelectronics
Solid‐state electrochemistry is applied to detect the presence of chromium centres with high oxidation states in chromium‐doped cassiterite and tin‐sphene ceramic pigmenting systems. Voltammetric data indicate that Cr V and Cr IV centres with different coordinative arrangements exist in the studied materials, and yield proton‐assisted reduction processes at +0.95, +0.42 AgCl/Ag in contact with 0.50 M H 2 SO 4 . Electrochemical measurements are correlated with spectroscopic data. The Cr IV and Cr V metal ions display a significant light‐driven electrocatalytic effect on the oxidation of 1,4‐dihydrobenzoquinone and Fe(CN) 6 4– ions that involves the formation of surface‐confined adducts. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2006)