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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Tkachenko, Nikolai V.
Tampere University
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (19/19 displayed)
- 2024Laterally Bound Co Porphyrin on CdTe QD : A Long-Lived Charge-Separated Nanocompositecitations
- 2024Contactless analysis of surface passivation and charge transfer at the TiO 2-Si interfacecitations
- 2024Contactless analysis of surface passivation and charge transfer at the TiO 2-Si interfacecitations
- 2024Transient Absorption Spectroscopy of Filmscitations
- 2024Contactless analysis of surface passivation and charge transfer at the TiO2-Si interfacecitations
- 2023Laterally Bound Co Porphyrin on CdTe QD : A Long-Lived Charge-Separated Nanocompositecitations
- 2023Is Carrier Mobility a Limiting Factor for Charge Transfer in Tio2/Si Devices? A Study by Transient Reflectance Spectroscopycitations
- 2022Tunable Ti3+-Mediated Charge Carrier Dynamics of Atomic Layer Deposition-Grown Amorphous TiO2citations
- 2021Comparison of the heat-treatment effect on carrier dynamics in TiO2 thin films deposited by different methodscitations
- 2020Optimization of photogenerated charge carrier lifetimes in ald grown tio2 for photonic applicationscitations
- 2020Monitoring Charge Carrier Diffusion across a Perovskite Film with Transient Absorption Spectroscopycitations
- 2019Multiphoton Excitation of CsPbBr3 Perovskite Quantum Dots (PQDs) : How Many Electrons Can One PQD Donate to Multiple Molecular Acceptors?citations
- 2019Electronically Coupled Uranium and Iron Oxide Heterojunctions as Efficient Water Oxidation Catalystscitations
- 2019Electronically Coupled Uranium and Iron Oxide Heterojunctions as Efficient Water Oxidation Catalystscitations
- 2019Refractive index change dominates the transient absorption response of metal halide perovskite thin films in the near infraredcitations
- 2018Critical role and modification of surface states in hematite films for enhancing oxygen evolution activitycitations
- 2017Tailored Fabrication of Transferable and Hollow Weblike Titanium Dioxide Structurescitations
- 2015Subpicosecond to Second Time-Scale Charge Carrier Kinetics in Hematite-Titania Nanocomposite Photoanodescitations
- 2015Subpicosecond to Second Time-Scale Charge Carrier Kinetics in Hematite-Titania Nanocomposite Photoanodescitations
Places of action
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article
Critical role and modification of surface states in hematite films for enhancing oxygen evolution activity
Abstract
<p>Hematite films deposited by plasma-enhanced chemical vapor deposition of iron pentacarbonyl [Fe(CO)(5)] in an oxygen plasma were modified by postdeposition (i) oxygen plasma treatment and (ii) short annealing treatments to reduce the defects and to modify the (sub)surface states and consequently the photoelectrochemical properties. The oxygen plasma treatment resulted in the increase of particle size and augmented surface roughening by densification of grains. Moreover, it induced saturated surface states with reactive oxygen species (O-, OH-), evident in the X-ray photoelectron spectroscopy (XPS). Under standard illumination (1.5 AM; 100 mW/cm(2); 150 W xenon lamp), when compared to the pristine hematite coating (0.696 mA/cm(2) at 1.23 V versus RHE and 0.74 V-onset) the oxygen plasma-treated films showed severe deterioration in photocurrent density of 0.035 mA/cm(2) and an anodic shift in the onset potential (1.10 V-onset) due to oxygen rich surface. In a second set of experiments, the oxygen plasma-treated hematite films were briefly annealed (10 min at 750 degrees C) and the signals of Fe 2p and O 1s recovered to higher binding energies, indicating the formation of oxygen vacancies. In addition, a superior photocurrent density value of max. 1.306 mA/cm(2) at 1.23 V versus RHE to that of the pristine hematite photoanode with 0.74 V-onset was obtained. Transient absorption spectroscopy further elucidated that the oxygen plasma-induced electron trap states acting as recombination centers that are unfavorable for photoelectrochemical activity. The alteration in Fe:O stoichiometry and thus photocurrent density are corroborated by determination of water oxidation rates in annealed (7.1 s(-1)) and oxygen plasma treated (2.5 s(-1)) samples.</p>