Mixed oxides for photo-electrochemical applications

Pablo Ampudia, Simonetta Palmas, Annalisa Vacca, Michele Mascia, Laura Mais, Frank Marken

Research output: Chapter in Book/Report/Conference proceedingChapter

2 Citations (Scopus)

Abstract

The photoexcitation of an n-type photo-anode and a p-type photo-cathode provides electrons and holes in photo-electrochemical processes. Depending on the use of photosensitive material as anode, cathode or both, different photo-electrochemical (PEC) system configurations and experimental conditions have to be taken into account to consider "green" the photo-electrochemical process when solar energy and water are use to drive the process. Several studies have been done by our group in order to obtain a photo-anode driven PEC cell in which a lowering of the applied cell voltage was obtained from the photo-potential generated at TiO2 nanotubular structures. Among other p-type semiconductors, Ni oxides based photo-cathodes, coupled to different photo-anodes are proposed in the literature as inexpensive semiconductors in photo-catalysis. However, the absorption spectrum of these metal oxides is limited to ultraviolet region due to their large band gap and therefore efforts to activate Ni oxide and TiO2 for a visible light range have to be done. In particular, the literature proposed the combination of different electronic structures, based on mixed metal oxide photocatalysts to enhance the light-response range to the visible region, thereby promoting the photo-catalytic efficiency. The present work proposes the synthesis of hierarchical structures of Ti/Al and Ni/Al mixed oxides. TiO2 nanotubular structures were obtained by oxidation of a Ti foil in deionized water and glycerol organic solution with NH4F at room temperature. Ni oxide films were obtained supported onto Indium Tin Oxide (ITO) coated glass. Doctor-blade method and subsequent annealing treatment were adopted to obtain a stable structure. Commercially available Nickel oxide nanopowders and nanowires were used, as well as alcoholic solution of nickel-nitrate salt, all dissolved into N,N-dimethylformamide (DMF) were used as precursor solutions to obtain home-made Ni oxide. Aluminum oxide, embedded in the Ni oxide and Ti oxide structures by repeated dipping/thermal cycles, is proposed to enhance the photo-catalytic performance of the bare Ti and Ni oxides. The materials were morphologically and electrochemically characterized by scanning electron microscopy, cyclic voltammetry and chrono-amperometry analysis. The stability and photo-catalytic activity of the synthesized samples were studied.

LanguageEnglish
Title of host publicationChemical Engineering Transactions
PublisherItalian Association of Chemical Engineering - AIDIC
Pages145-150
Number of pages6
ISBN (Print)9788895608389
DOIs
StatusPublished - 1 Mar 2016

Publication series

NameChemical Engineering Transactions
Volume47
ISSN (Electronic)22839216

Fingerprint

Oxides
Anodes
Cathodes
Metals
Semiconductor materials
Photoelectrochemical cells
Dimethylformamide
Aluminum Oxide
Photocatalysis
Photoexcitation
Deionized water
Photocatalysts
Glycerol
Solar energy
Metal foil
Cyclic voltammetry
Oxide films
Nanowires
Electronic structure
Absorption spectra

Cite this

Ampudia, P., Palmas, S., Vacca, A., Mascia, M., Mais, L., & Marken, F. (2016). Mixed oxides for photo-electrochemical applications. In Chemical Engineering Transactions (pp. 145-150). (Chemical Engineering Transactions; Vol. 47). Italian Association of Chemical Engineering - AIDIC. https://doi.org/10.3303/CET1647025

Mixed oxides for photo-electrochemical applications. / Ampudia, Pablo; Palmas, Simonetta; Vacca, Annalisa; Mascia, Michele; Mais, Laura; Marken, Frank.

Chemical Engineering Transactions. Italian Association of Chemical Engineering - AIDIC, 2016. p. 145-150 (Chemical Engineering Transactions; Vol. 47).

Research output: Chapter in Book/Report/Conference proceedingChapter

Ampudia, P, Palmas, S, Vacca, A, Mascia, M, Mais, L & Marken, F 2016, Mixed oxides for photo-electrochemical applications. in Chemical Engineering Transactions. Chemical Engineering Transactions, vol. 47, Italian Association of Chemical Engineering - AIDIC, pp. 145-150. https://doi.org/10.3303/CET1647025
Ampudia P, Palmas S, Vacca A, Mascia M, Mais L, Marken F. Mixed oxides for photo-electrochemical applications. In Chemical Engineering Transactions. Italian Association of Chemical Engineering - AIDIC. 2016. p. 145-150. (Chemical Engineering Transactions). https://doi.org/10.3303/CET1647025
Ampudia, Pablo ; Palmas, Simonetta ; Vacca, Annalisa ; Mascia, Michele ; Mais, Laura ; Marken, Frank. / Mixed oxides for photo-electrochemical applications. Chemical Engineering Transactions. Italian Association of Chemical Engineering - AIDIC, 2016. pp. 145-150 (Chemical Engineering Transactions).
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