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Aqueous photo(electro)catalysis with eumelanin thin films
Univ Naples Federico II, Italy.
Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, Faculty of Science & Engineering.
Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, Faculty of Science & Engineering. Rudjer Boskovic Inst, Croatia.
Univ Naples Federico II, Italy; CNR, Italy; Natl Interuniv Consortium Mat Sci and Technol INSTM, Italy.
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2018 (English)In: Materials Horizons, ISSN 2051-6347, E-ISSN 2051-6355, Vol. 5, no 5, p. 984-990Article in journal (Refereed) Published
Abstract [en]

We report that eumelanin, the ubiquitous natural pigment found in most living organisms, is a photocatalytic material. Though the photoconductivity of eumelanin and its photochemical reactions with oxygen have been known for some time, eumelanins have not been regarded as photofaradaic materials. We find that eumelanin shows photocathodic behavior for both the oxygen reduction reaction and the hydrogen evolution reaction. Eumelanin films irradiated in aqueous solutions at pH 2 or 7 with simulated solar light photochemically reduce oxygen to hydrogen peroxide with accompanying oxidation of sacrificial oxalate, formate, or phenol. Autooxidation of the eumelanin competes with the oxidation of donors. Deposition of thin films on electrodes yields photoelectrodes with higher photocatalytic stability compared with the case of pure photocatalysis, implicating the successful extraction of positive charges from the eumelanin layer. These results open up new potential applications for eumelanin as a photocatalytically-active biomaterial, and inform the growing fundamental body of knowledge about the physical chemistry of eumelanins.

Place, publisher, year, edition, pages
ROYAL SOC CHEMISTRY , 2018. Vol. 5, no 5, p. 984-990
National Category
Theoretical Chemistry
Identifiers
URN: urn:nbn:se:liu:diva-151797DOI: 10.1039/c8mh00715bISI: 000444245600023OAI: oai:DiVA.org:liu-151797DiVA, id: diva2:1253310
Note

Funding Agencies|Knut and Alice Wallenberg Foundation; Italian Project RELIGHT [PON02_00556_3306937]

Available from: 2018-10-04 Created: 2018-10-04 Last updated: 2018-10-24

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