New Fe<sub>2</sub>TiO<sub>5</sub>-based nanoheterostructured mesoporous photoanodes with improved visible light photoresponses

Courtin, Émilie; Baldinozzi, Gianguido; Sougrati, Moulay Tahar; Stievano, Lorenzo; Sánchez, Clément; Laberty-Robert, Christel

doi:10.1039/c4ta00102h

Cited by 61 publications

(66 citation statements)

References 62 publications

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“…Figure SI-3 confirmed that only ferric ions are present in the material. More precisely, three sites are observed upon deconvolution of the spectrum that can be attributed to the 4c and 8f sites of the orthorhombic structure 26,82 and to the 8f site of the monoclinic one, in good agreement with PDF data. 79 The diffractograms of phase pure TiO 2 anatase, α- However, the brown color of the sample is in disagreement with a mixed iron oxide and all metal atoms are fully oxidized.…”

Section: Nanoparticle Characterizationssupporting

confidence: 69%

“…Moreover, iron doping has shown to favor the brookite TiO 2 polymorph at the expense of the anatase. 22,26 For %Fe higher than 10, XRD patterns strongly evolve, indicating a phase transition which becomes more obvious in TiO 2 -33%Fe. A peak at around 18° (2q) appears which can be assigned to orthorhombic Fe 2 TiO 5 which has a pseudobrookite structure and eventually to a monoclinic polytype Fe 2 TiO 5 .…”

Section: Nanoparticle Characterizationsmentioning

confidence: 99%

“…We note that some reports in the literature highlight the benefit of designing heterojunctions to enhance the charge separation. [25][26][27][28] However, none of them studied together the impact of doping level, atoms ordering and heterostructures formation in the Ti-Fe-O system get high photo(electrochemical) efficiency.…”

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confidence: 99%

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

et al. 2016

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We discuss here for the first time how to combine iron and titanium metal ions to achieve a high photo-electrochemical activity for TiO 2 -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 TiO 2 anatase doped with various Fe amounts were prepared. Strikingly, at higher ferric concentrations, propose that the nature of the heterojunction impacts charge carrier recombination. 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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Section: Nanoparticle Characterizationssupporting

confidence: 69%

Section: Nanoparticle Characterizationsmentioning

confidence: 99%

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

et al. 2016

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“…3b, the typical Fe 2p 3/2 and Fe 2p 1/2 peaks can be found at 711.05 eV and 724.97 eV, which is consistent with those of Fe 2 TiO 5 . 20 The Ti 2p spectrum in Fig. 3c can be deconvoluted into two peaks, which are assigned to Ti 2p 1/2 and Ti 2p 3/2 .…”

Section: Resultsmentioning

confidence: 99%

Light absorption modulation of novel Fe₂TiO₅ inverse opals for photoelectrochemical water splitting

Lan

Liu

et al. 2017

New J. Chem.

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are the most promising anode materials for the assembly of photoelectrochemical devices. However, their intrinsic poor light absorption (TiO 2 ) and poor electrical conductivity (Fe 2 O 3 ) seriously limit their industrial feasibility. Thus, it is of great importance to develop novel Fe-Ti-O systems which can combine the characteristics of high charge mobility, long carrier lifetime and visible lightdriven activity. In this paper, novel Fe 2 TiO 5 inverse opals with modulated light absorption were prepared using polystyrene (PS) photonic crystals as templates. The maximum overlap between the stop-bands and the absorption edges was found to be beneficial for the multiple scattering of visible light. Due to the enhanced light absorption and superior charge separation, inverse opals fabricated using 250 nm PS spheres exhibited higher photocurrent density than Fe 2 O 3 , TiO 2 and disordered Fe 2 TiO 5 film. The performance of the photoanodes could be further improved by the deposition of FeOOH as a cocatalyst. This work provides a principal method for the development of novel photoanodes with modulated microstructures for efficient photoelectrochemical applications.

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“…Fe 2 TiO 5 is a narrow bandgap semiconductor of ca. 2.2 eV with the valence band edge surpassing the water oxidation level 18 . In particular, the CBM of Fe 2 TiO 5 lies nearly at the same energy level as that of TiO 2 , leading to a quick onset of photocurrent under visible light irradiations.…”

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confidence: 99%

Aligned Fe2TiO5-containing nanotube arrays with low onset potential for visible-light water oxidation

et al. 2014

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There remains a pressing challenge in the efficient utilization of visible light in the photoelectrochemical applications of water splitting. Here, we design and fabricate pseudobrookite Fe 2 TiO 5 ultrathin layers grown on vertically aligned TiO 2 nanotube arrays that can enhance the conduction and utilization of photogenerated charge carriers. Our photoanodes are characterized by low onset potentials of B0.2 V, high photon-to-current efficiencies of 40-50% under 400-600 nm irradiation and total energy conversion efficiencies of B2.7%. The high performance of Fe 2 TiO 5 nanotube arrays can be attributed to the anisotropic charge carrier transportation and elongated charge carrier diffusion length (compared with those of conventional TiO 2 or Fe 2 O 3 photoanodes) based on electrochemical impedance analysis and first-principles calculations. The Fe 2 TiO 5 nanotube arrays may open up more opportunities in the design of efficient and low-cost photoanodes working in visible light for photoelectrochemical applications.

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New Fe₂TiO₅-based nanoheterostructured mesoporous photoanodes with improved visible light photoresponses

Cited by 61 publications

References 62 publications

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

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

Light absorption modulation of novel Fe₂TiO₅ inverse opals for photoelectrochemical water splitting

Aligned Fe2TiO5-containing nanotube arrays with low onset potential for visible-light water oxidation

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New Fe2TiO5-based nanoheterostructured mesoporous photoanodes with improved visible light photoresponses

Cited by 61 publications

References 62 publications

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

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

Light absorption modulation of novel Fe2TiO5 inverse opals for photoelectrochemical water splitting

Aligned Fe2TiO5-containing nanotube arrays with low onset potential for visible-light water oxidation

Contact Info

Product

Resources

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New Fe₂TiO₅-based nanoheterostructured mesoporous photoanodes with improved visible light photoresponses

Light absorption modulation of novel Fe₂TiO₅ inverse opals for photoelectrochemical water splitting