Solar-driven electrochemically assisted semiconductor-catalyzed iodide ion oxidation. Enhanced efficiency by oxide mixtures

• Authors: Chockalingam Karunakaran , Premkumar Anilkumar
• Languages of publication: EN

Abstracts

EN

Oxidation of iodide ion from an air-saturated solution under natural sunlight (900±50 W m−2) on the surfaces of TiO2, ZnO, Fe2O3, MoO3 and CeO2 enhances by 6 to 12-fold on application of a cathodic bias of −0.2 to −0.3 V (vs NHE) to the semiconductors; light, the semiconductor and dissolved oxygen are essential for iodine generation. The semiconductors under an anodic bias of +0.2 to +0.3 V (vs NHE) fail to oxidize iodide ion from air-saturated solution under sunlight. Under cathodic bias, semiconductor mixtures like TiO2-ZnO, TiO2-Fe2O3 and ZnO-Fe2O3 show enhanced photocatalytic activity, indicating improved charge separation in oxide mixtures. The mechanism of photocatalysis under cathodic bias is discussed. [...]

Keywords

EN

Semiconductor; Photocatalysis; Potential bias; Sunlight

• Publisher: De Gruyter Open
• Journal: Open Chemistry
• Year: 2009
• Volume: 7
• Issue: 3
• Pages: 519-523

Dates

published

1 - 9 - 2009

online

21 - 6 - 2009

Contributors

author

Chockalingam Karunakaran

• Department of Chemistry, Annamalai University, Annamalainagar, 608002, Tamilnadu, India

author

Premkumar Anilkumar

• Department of Chemistry, Annamalai University, Annamalainagar, 608002, Tamilnadu, India

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Identifiers

DOI

10.2478/s11532-009-0056-5