| People | Locations | Statistics |
|---|---|---|
| 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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Denisov, Nikita
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (8/8 displayed)
- 2023Single Atoms in Photocatalysis: Low Loading Is Good Enough!citations
- 2022A Few Pt Single Atoms Are Responsible for the Overall Co‐Catalytic Activity in Pt/TiO <sub>2</sub> Photocatalytic H <sub>2</sub> Generationcitations
- 2022Light‐Induced Agglomeration of Single‐Atom Platinum in Photocatalysiscitations
- 2022A facile “dark”-deposition approach for Pt single‐atom trapping on facetted anatase TiO2 nanoflakes and use in photocatalytic H2 generationcitations
- 2021Thermal Ramping Rate during Annealing of TiO2 Nanotubes Greatly Affects Performance of Photoanodescitations
- 2021Thermal Ramping Rate during Annealing of TiO<sub>2</sub> Nanotubes Greatly Affects Performance of Photoanodescitations
- 2020A Dewetted-Dealloyed Nanoporous Pt Co-Catalyst Formed on TiO2 Nanotube Arrays Leads to Strongly Enhanced Photocatalytic H-2 Productioncitations
- 2020A Dewetted-Dealloyed Nanoporous Pt Co-Catalyst Formed on TiO2 Nanotube Arrays Leads to Strongly Enhanced Photocatalytic H2 Productioncitations
Places of action
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article
A Dewetted-Dealloyed Nanoporous Pt Co-Catalyst Formed on TiO2 Nanotube Arrays Leads to Strongly Enhanced Photocatalytic H2 Production
Abstract
<p>Pt nanoparticles are typically decorated as co-catalyst on semiconductors to enhance the photocatalytic performance. Due to the low abundance and high cost of Pt, reaching a high activity with minimized co-catalyst loadings is a key challenge in the field. We explore a dewetting-dealloying strategy to fabricate on TiO<sub>2</sub> nanotubes nanoporous Pt nanoparticles, aiming at improving the co-catalyst mass activity for H<sub>2</sub> generation. For this, we sputter first Pt-Ni bi-layers of controllable thickness (nm range) on highly ordered TiO<sub>2</sub> nanotube arrays, and then induce dewetting-alloying of the Pt-Ni bi-layers by a suitable annealing step in a reducing atmosphere: the thermal treatment causes the Pt and Ni films to agglomerate and at the same time mix with each other, forming on the TiO<sub>2</sub> nanotube surface metal islands of a mixed PtNi composition. In a subsequent step we perform chemical dealloying of Ni that is selectively etched out from the bimetallic dewetted islands, leaving behind nanoporous Pt decorations. Under optimized conditions, the nanoporous Pt-decorated TiO<sub>2</sub> structures show a>6 times higher photocatalytic H<sub>2</sub> generation activity compared to structures modified with a comparable loading of dewetted, non-porous Pt. We ascribe this beneficial effect to the nanoporous nature of the dealloyed Pt co-catalyst, which provides an increased surface-to-volume ratio and thus a more efficient electron transfer and a higher density of active sites at the co-catalyst surface for H<sub>2</sub> evolution.</p>