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The effect of downs...
The effect of downstream laser fragmentation on the specific surface area and photoelectrochemical performance of barium tantalum oxynitride
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- Haydous, Fatima (författare)
- KTH,Kemi,Paul Scherrer Inst, Lab Multiscale Mat Expt, CH-5232 Villigen, Switzerland
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- Waag, Friedrich (författare)
- Univ Duisburg Essen, Tech Chem 1, D-45141 Essen, Germany.;Univ Duisburg Essen, Ctr Nanointegrat Duisburg Essen CENIDE, D-45141 Essen, Germany.
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- Si, Wenping (författare)
- Paul Scherrer Inst, Lab Multiscale Mat Expt, CH-5232 Villigen, Switzerland.;Tianjin Univ, Sch Mat Sci & Engn, Key Lab Adv Ceram & Machining Technol, Minist Educ, Tianjin 300072, Peoples R China.
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- Li, Fei (författare)
- Paul Scherrer Inst, Lab Multiscale Mat Expt, CH-5232 Villigen, Switzerland.
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- Barcikowski, Stephan (författare)
- Univ Duisburg Essen, Tech Chem 1, D-45141 Essen, Germany.;Univ Duisburg Essen, Ctr Nanointegrat Duisburg Essen CENIDE, D-45141 Essen, Germany.
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- Goekce, Bilal (författare)
- Univ Duisburg Essen, Tech Chem 1, D-45141 Essen, Germany.;Univ Duisburg Essen, Ctr Nanointegrat Duisburg Essen CENIDE, D-45141 Essen, Germany.
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- Lippert, Thomas (författare)
- Paul Scherrer Inst, Lab Multiscale Mat Expt, CH-5232 Villigen, Switzerland.;Swiss Fed Inst Technol, Lab Inorgan Chem, Dept Chem & Appl Biosci, CH-8093 Zurich, Switzerland.;Kyushu Univ, Mol Photoconvers Devices Div, I2CNER, 744 Motooka, Fukuoka 8190395, Japan.
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(creator_code:org_t)
- Elsevier BV, 2020
- 2020
- Engelska.
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Ingår i: Applied Surface Science. - : Elsevier BV. - 0169-4332 .- 1873-5584. ; 510
- Relaterad länk:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- One approach to improve the photoelectrochemical solar water splitting performance of photoanodes based on oxynitride perovskite particles is through increasing the active surface area which allows the generation of more electron-hole pairs that contribute in the water reduction and oxidation reactions. In this study, we explore the pros and cons of downstream laser fragmentation as a method to increase the specific surface area of oxynitride particles and highlight the important issues that must be considered for effective solar water splitting. The synthesis of particles with a high surface area of up to 32.4 m(2) g(-1) is demonstrated. Furthermore, the fragmented oxynitrides revealed lower absorbance values, a blue shift in the absorption edge and a higher background absorbance. These observations, in addition to the lower crystalline quality of the fragmented oxynitrides, were attributed to the loss of N content during fragmentation and the formation of secondary phases. The photoanodes based on the fragmented particles showed lower photocurrents than those prepared from the unfragmented particles even though the surface area was increased. The decrease in photoactivity was ascribed to the presence of more grain boundaries in the fragmented oxynitride photoanodes which leads to more recombinations of the photogenerated carriers. Interestingly, after seven fragmentation passages, the photocurrent starts to increase again due to the formation of an amorphous layer which improves the transport of the photogenerated carriers.
Ämnesord
- NATURVETENSKAP -- Kemi -- Annan kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Other Chemistry Topics (hsv//eng)
Nyckelord
- Laser fragmentation in liquids
- Laser ablation
- Solar water splitting
- Oxynitrides
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