References of "Job, Nathalie"
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See detailCorrelation between morphology and electrical conductivity of dried and carbonized multi-walled carbon nanotube/resorcinol–formaldehyde xerogel composites
Haghgoo, M.; Yousefi, A. A.; Mehr, M. J. Z. et al

in Journal of Materials Science (in press)

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See detailA new design of organic radical batteries (ORBs): carbon nanotube buckypaper electrode functionalized by electrografting
Aqil, Abdelhafid ULg; Vlad, Alexandru; Piedboeuf, Marie-Laure ULg et al

in Chemical Communications (2015), 51(45), 9301-9304

A novel hybridmaterial displaying a fast and reversible charge storage capability is prepared by electrografting of an alkoxyamine-bearing acrylate onto a carbon nanotube buckypaper, followed by the quan ... [more ▼]

A novel hybridmaterial displaying a fast and reversible charge storage capability is prepared by electrografting of an alkoxyamine-bearing acrylate onto a carbon nanotube buckypaper, followed by the quan- titative generation of an electroactive polynitroxide. [less ▲]

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See detailInfluence of the textural parameters of resorcinol–formaldehyde dry polymers and carbon xerogels on particle sizes upon mechanical milling
Piedboeuf, Marie-Laure ULg; Léonard, Alexandre ULg; Traina, Karl et al

in Colloids and Surfaces A : Physicochemical and Engineering Aspects (2015), 471

Porous carbons find various applications in catalysis, electrochemical storage or sorption. Prior to use, their particle sizes need however to be controlled according to the targeted application. In this ... [more ▼]

Porous carbons find various applications in catalysis, electrochemical storage or sorption. Prior to use, their particle sizes need however to be controlled according to the targeted application. In this study, the grinding behavior of materials prepared from aqueous resorcinol–formaldehyde mixtures and displaying different pore textures was studied in detail. Both dry polymer gels and pyrolyzed carbon xerogels were compared in terms of particle size distributions after planetary ball-milling. The results show that the pore texture and the qualitative hardness of the materials have a strong influence on the grinding behavior, especially if carbon xerogels pyrolyzed before grinding are considered. On the other hand, it appears that the milling of polymer gels, followed by a pyrolysis step, is the most efficient way to obtain homogeneous particle size distributions, for all of the investigated mesopore textures. In this case, carbon particles displaying a narrow grain size distribution centered on a mode value near 10 μm are successfully obtained after similar grinding durations, with retention of the mesopore texture of the starting materials. This work also demonstrates the possibility of using mercury intrusion porosimetry as an interesting tool to assess simultaneously the mesopore dimensions and the particle sizes of porous powders. [less ▲]

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See detailDevelopment of novel SOlid Materials for high power Li polymer BATteries (SOMABAT). Recyclability of components.
Zubizarreta, Leire; Gil-Agusti, Mayte; Garcia. et al

in Briec, E.; Müller., B. (Eds.) Electric Vehicle Batteries: Moving from Research towards Innovation. Lecture notes on mobility (2015)

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See detailDesign of Pt/carbon xerogel catalysts for PEM fuel cells
Job, Nathalie ULg; Lambert, Stéphanie ULg; Zubiaur, Anthony ULg et al

in Catalysts (2015), 5

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See detailA facile and fast electrochemical route to produce functional few-layer graphene sheets for lithium battery anode application
Ouhib, Farid ULg; Aqil, Abdelhafid ULg; Thomassin, Jean-Michel ULg et al

in Journal of Materials Chemistry A (2014), 2(37), 15298-15302

A simple approach for the production of polymer functionalized graphene nanosheets is reported. The resulting polyacrylonitrile chemisorbed on graphene sheets is made of 1 to 2 layers, with a large ... [more ▼]

A simple approach for the production of polymer functionalized graphene nanosheets is reported. The resulting polyacrylonitrile chemisorbed on graphene sheets is made of 1 to 2 layers, with a large majority of graphene single-layers. This novel functionalized graphene exhibits good cycling stability as an anode in Li-ion batteries without a conductive additive or binder. [less ▲]

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See detailResorcinol-Formaldehyde Carbon Xerogels as Lithium-Ion Battery Anodes: Synthesis, Grinding, Coating on current collector and Electrochemical characterization
Piedboeuf, Marie-Laure ULg; Léonard, Alexandre ULg; Pirard, Jean-Paul ULg et al

Poster (2014, July 17)

Rechargeable lithium-ion batteries show great advantages over traditional batteries and are extensively used for consumer electronic devices due to their high energy density and long cycle life. However ... [more ▼]

Rechargeable lithium-ion batteries show great advantages over traditional batteries and are extensively used for consumer electronic devices due to their high energy density and long cycle life. However, the improvement of performance of current lithium-ion batteries requires the optimization of the materials used (electrolyte and electrodes). Therefore, tremendous efforts have been dedicated to exploring new materials with high capacity, excellent cycling performance, low cost and high safety features [1-4]. As an example, carbon xerogels are promising candidates in the development of new high performance C-based anode materials for Li-ion batteries, since such carbonaceous materials show very small changes of volume during the charge/discharge process, providing an improved cycle life. Nevertheless, hard carbons also exhibit quite high irreversible capacity losses due to their intrinsic high microporosity and, compared to graphite, a poor rate performance related to slow diffusion of Li in the internal structure [5-6]. To reduce these disadvantages, the structural and textural characteristics need to be carefully controlled. Also, due to the different morphology of these materials compared to graphite, the deposition of carbon xerogels on current collectors needs to be studied in detail. In this work, porous carbon xerogels were synthetized from Resorcinol-Formaldehyde mixtures by adjusting the pH of the solution in order to obtain different mesopore sizes. Monoliths of carbon xerogels were obtained after drying of the polymer gel and pyrolysis [7]. Mercury intrusion porosimetry and nitrogen adsorption techniques (BET) was used to characterize the pore texture of the carbon xerogels. These monoliths were ground to particles around 10 µm for all the samples. The resulting powders were then mixed with a binder and a solvent to form slurries and then cast on copper foil using a bar coater. After evaporation of the solvent, the resulting coatings were analyzed using scanning electron microscopy (SEM) for the morphology and their thickness was monitored by profilometry. The resulting electrodes were subjected to electrochemical characterization. Since the particle sizes and the method of coating was the same for all the samples, it was possible to evaluate selectively the influence of the textural and structural parameters of the different carbon materials on their performances. Electrochemical characterizations were performed using charge-discharge galvanostatic curves and cyclic voltammetry in Li/C half cells between 0.005 and 1.5 V vs. Li+/Li. References 1) Goodenough J.B., Kim Y. J. Power Sources 2011; 196(16): 6688-6694. 2) Bruce P.G. Solid State Ionics 2008; 179: 752-760. 3) Armand M., Tarascon J.-M., Nature 2008; 451: 652-657. 4) Scrosati B., Garche J., J. Power Sources 2010 ; 195 : 2419-2430. 5) Yuan X., Chao Y.-J., Ma Z.-F., Deng X., Electrochemistry Communications 2007 ; 9 : 2591-2595. 6) Zanto E.J., Ritter J.A., Popov B.N., Proceedings - Electrochemical Society 1999; 98-16: 71-8. 7) Job N., Théry A., Pirard R., Marien J., Kocon L., Rouzaud J., Béguin F., Pirard J. Carbon 2005; 43: 2481-2494. [less ▲]

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See detailSynthesis of Pt/Carbon Xerogel Electrocatalysts for PEM Fuel Cells by the Multiple SEA Method
Zubiaur, Anthony ULg; Chatenet, Marian; Maillard, Frédéric et al

Poster (2014, July)

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See detailSynthesis of Pt/Carbon Xerogel Electrocatalysts for Proton Exchange Membrane Fuel Cells (PEMFC): Effect of the Reduction Procedure
Zubiaur, Anthony ULg; Chatenet, Marian; Maillard, Frédéric et al

Conference (2014, July)

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See detailDesign of Pt/carbon xerogel catalysts for PEM fuel cells
Job, Nathalie ULg; Lambert, Stéphanie ULg; Zubiaur, Anthony ULg et al

Conference (2014, July)

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See detailInfluence du broyage mécanique sur la taille et les paramètres texturaux de particules de xérogels de carbone
Piedboeuf, Marie-Laure ULg; Léonard, Alexandre ULg; Traina, Karl et al

Conference (2014, May 15)

Les xérogels de carbone sont des candidats prometteurs pour une utilisation dans de nombreux domaines tels que le stockage de l’énergie électrochimique (anodes pour batteries Li-ion ou supercondensateurs ... [more ▼]

Les xérogels de carbone sont des candidats prometteurs pour une utilisation dans de nombreux domaines tels que le stockage de l’énergie électrochimique (anodes pour batteries Li-ion ou supercondensateurs), l’adsorption ou en tant que supports de catalyseurs (dont les électrocatalyseurs de pile à combustible PEM, par exemple) [1]. En plus de leur grande pureté, un des avantages principaux des xérogels de carbone est de pouvoir contrôler leur texture poreuse notamment via les conditions de synthèse [2, 3]. Ce sont les étapes de séchage et de pyrolyse qui permettent de moduler la texture finale des matériaux obtenus. Après vieillissement, les mélanges aqueux résorcinol-formaldéhyde mènent à des gels polymères susceptibles d’être convertis en polymères secs après séchage sous vide et, in fine, en xérogels de carbone après pyrolyse sous atmosphère inerte. Au cours de ces étapes, les produits obtenus restent cependant sous forme monolithique. Dans le cadre des applications pré-citées (catalyse, stockage électrochimique ou adsorption), il est néanmoins nécessaire de réduire les pièces monolithiques en particules de dimensions appropriées pour l’application cible. Dans ce cas, une étape clé est de pouvoir contrôler leur taille finale. Le comportement à l’attrition de matériaux présentant différentes textures poreuses a été étudié en détail. Les broyages ont été effectués dans un broyeur planétaire en conditions sèche ou humide sur des gels polymères secs ainsi que sur des xérogels de carbone obtenus après pyrolyse à 800°C. La granulométrie laser à diffraction lumineuse ainsi que la microscopie électronique à balayage ont été utilisées afin d’évaluer la distribution des tailles particulaires de la poudre broyée. Les résultats indiquent que la texture poreuse des matériaux, leur nature (polymère ou carbone) et leur dureté sont des facteurs significatifs qui influencent fortement les mécanismes de comminution/fragmentation lors du broyage, en particulier si l’on considère les xérogels de carbone. En effet, il apparait que le broyage par voie sèche de polymères secs (avant pyrolyse) semble être la manière la plus efficace pour obtenir une distribution de taille de particules homogène pour toutes les textures poreuses étudiées. Dans les conditions de broyage employées, il est possible d’obtenir des particules carbonées présentant une distribution de taille de particules centrée sur 10 µm, avec rétention de la texture mésoporeuse. Les résultats de cette recherche montrent également la possibilité d’utiliser la porosimétrie à intrusion de mercure en tant qu’outil pour évaluer simultanément la taille des mésopores ainsi que la taille des particules de matériaux broyés. 1. Yuan, X., Y.-J. Chao, Z.-F. Ma and X. Deng, Electrochemistry Communications, 9(10), 2591-2595 (2007). 2. Job, N., R. Pirard, J. Marien and J.-P. Pirard, Carbon, 42(3): p. 619-628 (2004). 3. Scherdel, C., R. Gayer and G. Reichenauer, J Porous Mater, 19(3): p. 351-360 (2012).  [less ▲]

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See detailUsing the Multiple SEA Method to Synthesize Pt/Carbon Xerogel Electrocatalysts for PEMFC Applications
Zubiaur, Anthony ULg; Chatenet, Marian; Maillard, Frédéric et al

in Fuel Cells - From Fundamentals to Systems (2014), 14(3), 343-349

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See detailRapid aqueous synthesis of ordered mesoporous carbons: Investigation of synthesis variables and application as anode materials for Li-ion batteries
Léonard, Alexandre ULg; Gommes, Cédric ULg; Piedboeuf, Marie-Laure ULg et al

in Microporousand Mesoporous Materials (2014), 195

Ordered mesoporous carbons (OMC) were synthesized via a direct templating pathway by a synthesis route that features short duration, moderate temperature and aqueous media. Resorcinol was used as carbon ... [more ▼]

Ordered mesoporous carbons (OMC) were synthesized via a direct templating pathway by a synthesis route that features short duration, moderate temperature and aqueous media. Resorcinol was used as carbon precursor and hexamethylenetetramine as a source of formaldehyde and ammonia to respectively cross-link the framework and regulate the pH. The temperature of the heat treatment leading to the formation of the solid polymer was shown to have a strong influence on the structural and textural parameters. In particular, moderate temperatures led to the coexistence of differently-sized entangled hexagonal mesostructures, whereas the higher temperatures led to a sharp decrease in the mesopore volume. The performance of these materials as anode materials for Li-ion batteries has been investigated in detail. Although these OMC show reversible capacities similar to those reported for hard carbons, their long-term cycling remains very stable for over 100 cycles of charge/discharge. The optimization of the reported short preparation pathway offers new possibilities regarding the application of ordered mesoporous carbons in various fields, such as energy storage, sorption and heterogeneous catalysis [less ▲]

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See detailCharacterization of multi-walled carbon nanotube dispersion in resorcinol-formaldehyde aerogel
Haghgoo, Majid; Yousefi, Ali Akbar; Zohouriaan Mehr, Mohammad Jalal et al

in Microporous and Mesoporous Materials (2014), 184

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