How Should Iron and Titanium be Combined in Oxides to Improve Photoelectrochemical Properties?

Petit, Sarah; Melissen, Sigismund T. A. G.; Duclaux, Loraine; Sougrati, Moulay T.; Le Bahers, Tangui; Sautet, Philippe; Dambournet, Damien; Borkiewicz, Olaf; Laberty-Robert, Christel; Durupthy, Olivier

doi:10.1021/acs.jpcc.6b05794

Title: How Should Iron and Titanium be Combined in Oxides to Improve Photoelectrochemical Properties?

Journal Article · Tue Oct 04 00:00:00 EDT 2016 · Journal of Physical Chemistry. C

DOI:https://doi.org/10.1021/acs.jpcc.6b05794· OSTI ID:1389050

Petit, Sarah ^[1]; Melissen, Sigismund T. A. G. ^[2]; Duclaux, Loraine ^[1]; Sougrati, Moulay T. ^[3]; Le Bahers, Tangui ^[2]; Sautet, Philippe ^[4]; Dambournet, Damien ^[1]; Borkiewicz, Olaf ^[5]; Laberty-Robert, Christel ^[1]; Durupthy, Olivier ^[1]

Sorbonne Univ., Paris (France)
Univ. de Lyon, Cedex (France)
Univ. Montpellier II, Cedex (France)
Univ. de Lyon, Cedex (France); Univ. of California, Los Angeles, CA (United States)
Argonne National Lab. (ANL), Argonne, IL (United States)

We discuss here for the first time how to combine iron and titanium metal ions to achieve a high photo-electrochemical activity for TiO₂-based photo-anodes in water splitting devices. To do so, a wide range of photoelectrode materials with tailored Ti/Fe ratio and element vicinity were synthesized by using the versatility of aqueous sol–gel chemistry in combination with a microwave-assisted crystallization process. At low ferric concentrations, single phase TiO₂ anatase doped with various Fe amounts were prepared. Strikingly, at higher ferric concentrations, we observed the concomitant crystallization of two polymorphs of Fe₂TiO₅. The as-synthesized compounds were tested as photoelectrode and compared with pure nanoparticles of TiO₂, Fe₂TiO₅ and α- or γ-Fe₂O₃ and with corresponding nanocomposites. When TiO₂ is slightly doped by Fe, the performance of this photo-electrode improves particularly in the low-bias region (< 1.0 V vs. reversible hydrogen electrode.) The photoanode exhibits a higher photocurrent than nanocomposite with TiO₂/Fe₂O₃ and FeTi₂O₅, and more cathodic onset potential. The former can be partly explained by a lower bandgap and a hole with a longer lifetime. For the latter, we propose that the nature of the heterojunction impacts charge carrier recombination. Here, the results presented herein not only answer whether iron and titanium should be combined in the same structure or into heterostructured systems, but also on the importance of the arrangement of ions in the structure to improve the performances of the photoanode.

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Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: Centre National de la Recherche Scientifique (CNRS); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22), Scientific User Facilities Division

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1389050

Journal Information:: Journal of Physical Chemistry. C, Vol. 120, Issue 43; ISSN 1932-7447

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 31 works

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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
"chimie-douce"
heterojunctions
photoanode
pseudo-brookite
water splitting

Title: How Should Iron and Titanium be Combined in Oxides to Improve Photoelectrochemical Properties?

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