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Hematite nanostructures: An old material for a new story. Simultaneous photoelectrochemical oxidation of benzylamine and hydrogen production through Ti doping
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science.ORCID iD: 0000-0003-4598-9556
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science.
Department of Chemical and Pharmaceutical Sciences, University of Ferrara, Ferrara, Italy.
Chemistry Department “Giacomo Ciamician”, University of Bologna, Bologna, Italy.
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2019 (English)In: Nano Energy, ISSN 2211-2855, E-ISSN 2211-3282, Vol. 61, p. 36-46Article in journal (Refereed) Published
Abstract [en]

Overall water splitting represents one of the most promising approaches toward solar energy conversion and storage, which is, however, severely challenged by the four-electron/four-proton nature of the oxygen evolution reaction (OER). One option to overcome this issue is to replace OER with a more useful reaction, for simultaneous production of both hydrogen and chemicals of interest. For the purpose, in this paper a cheap, hydrothermally prepared Ti-doped nanostructured hematite photoanode was employed for the first time as highly stable, heterogeneous catalyst for the low bias, efficient and highly selective photoinduced oxidation of benzylamine to N-benzylidenebenzylamine, and for the simultaneous production of hydrogen in a double solvent/environment cell. A preliminary estimate indicates the possibility to obtain a ∼150 μmol h−1 H2 production, with the contemporary production of stoichiometric benzylidene N-benzylamine in a 5 × 5 cm2 area electrode. This study contributes to overcome the 40-year lasting issues limiting the use of hematite in industrial photoelectrochemical sunlight conversion and storage, due to poor performance of hematite and lack of economic value of oxygen production, providing solid evidence for the simultaneous use of hematite in hydrogen production and alternative oxidation reactions of industrial importance.

Place, publisher, year, edition, pages
Elsevier, 2019. Vol. 61, p. 36-46
Keywords [en]
Hematite, Photoelectrochemistry, Photoanode, Benzylamine, Hydrogen
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Experimental Physics
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URN: urn:nbn:se:ltu:diva-73692DOI: 10.1016/j.nanoen.2019.04.013ISI: 000471201800005OAI: oai:DiVA.org:ltu-73692DiVA, id: diva2:1305573
Note

Validerad;2019;Nivå 2;2019-07-01 (johcin)

Available from: 2019-04-17 Created: 2019-04-17 Last updated: 2019-07-01Bibliographically approved

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Mazzaro, RaffaelloVomiero, Alberto

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