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3 results on '"Hanniet, Q."'

1. Aqueous metal-organic solutions for YSZ thin film inkjet deposition

Author

Gadea, C., Hanniet, Q., Lesch, A., Marani, D., Jensen, S. H., and Esposito, V.

Subjects
Physics - Applied Physics
Abstract

Inkjet printing of 8% Y2O3-stabilized ZrO2 (YSZ) thin films is achieved by designing a novel water-based reactive ink for Drop-on-Demand (DoD) inkjet printing. The ink formulation is based on a novel chemical strategy that consists of a combination of metal oxide precursors (zirconium alkoxide and yttrium salt), water and a nucleophilic agent, i.e. n-methyldiethanolamine (MDEA). This chemistry leads to metal-organic complexes with long term ink stability and high precision printability. Ink rheology and chemical reactivity are analyzed and controlled in terms of metal-organic interactions in the solutions. Thin dense nanocrystalline YSZ film below 150 nm are obtained by low temperature calcination treatments (400-500 {\deg}C), making the deposition suitable for a large variety of substrates, including silicon, glass and metals. Thin films and printed patterns achieve full densification with no lateral shrinkage and high ionic conductivity., Comment: 30 pages,6 figures, 2 tables, open access

Published
2019
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2. Aqueous metal–organic solutions for YSZ thin film inkjet deposition

Author

Debora Marani, Christophe Gadea, Andreas Lesch, Quentin Hanniet, Søren Højgaard Jensen, Vincenzo Esposito, Gadea, C., Hanniet, Q., Lesch, A., Marani, D., Jensen, S.H., and Esposito, V.

Subjects
Materials science, Silicon, OXIDE FUEL-CELL, SUSPENSIONS, Oxide, FABRICATION, chemistry.chemical_element, FOS: Physical sciences, 02 engineering and technology, Applied Physics (physics.app-ph), 010402 general chemistry, KeyWords Plus:YTTRIA-STABILIZED-ZIRCONIA, 01 natural sciences, LAYERS, law.invention, chemistry.chemical_compound, law, Materials Chemistry, Calcination, COMPOSITE ELECTROLYTE, Thin film, CONDUCTIVITY, TEMPERATURE, Yttria-stabilized zirconia, Zirconium, Aqueous solution, General Chemistry, Physics - Applied Physics, PERFORMANCE, 021001 nanoscience & nanotechnology, Nanocrystalline material, 0104 chemical sciences, chemistry, Chemical engineering, 0210 nano-technology, ANODE
Abstract

Inkjet printing of 8% Y2O3-stabilized ZrO2 (YSZ) thin films is achieved by designing a novel water-based reactive ink for Drop-on-Demand (DoD) inkjet printing. The ink formulation is based on a novel chemical strategy that consists of a combination of metal oxide precursors (zirconium alkoxide and yttrium salt), water and a nucleophilic agent, i.e. n-methyldiethanolamine (MDEA). This chemistry leads to metal-organic complexes with long term ink stability and high precision printability. Ink rheology and chemical reactivity are analyzed and controlled in terms of metal-organic interactions in the solutions. Thin dense nanocrystalline YSZ film below 150 nm are obtained by low temperature calcination treatments (400-500 {\deg}C), making the deposition suitable for a large variety of substrates, including silicon, glass and metals. Thin films and printed patterns achieve full densification with no lateral shrinkage and high ionic conductivity., Comment: 30 pages,6 figures, 2 tables, open access

Published
2017

3. Investigation of polymer-derived Si-(B)-C-N ceramic/reduced graphene oxide composite systems as active catalysts towards the hydrogen evolution reaction.

Author

Hanniet Q, Boussmen M, Barés J, Huon V, Iatsunskyi I, Coy E, Bechelany M, Gervais C, Voiry D, Miele P, and Salameh C

Abstract

Hydrogen Evolution Reaction (HER) is an attractive technology for chemical conversion of energy. Replacement of platinum with inexpensive and stable electrocatalysts remains a major bottleneck hampering large-scale hydrogen production by using clean and renewable energy sources. Here, we report electrocatalytically active and ultra-stable Polymer-Derived Ceramics towards HER. We successfully prepared ultrathin silicon and carbon (Si-C) based ceramic systems supported on electrically conducting 2D reduced graphene oxide (rGO) nanosheets with promising HER activity by varying the nature and the composition of the ceramic with the inclusion of nitrogen, boron and oxygen. Our results suggest that oxygen-enriched Si-B-C-N/rGO composites (O-SiBCN/rGO) display the strongest catalytic activity leading to an onset potential and a Tafel slope of - 340 mV and ~ 120 mV dec -1 respectively. O-SiBCN/rGO electrodes display stability over 170 h with minimal increase of 14% of the overpotential compared to ~ 1700% for commercial platinum nanoparticles. Our study provides new insights on the performance of ceramics as affordable and robust HER catalysts calling for further exploration of the electrocatalytic activity of such unconventional materials.

Published
2020
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