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2015

Articles:

Braghiroli, F. L., Fierro, V., Szczurek, A., Stein, N., Parmentier, J. and Celzard, A.
Ind. Crops Prod., 70:332-340
2015

Resume: Six porous carbon materials, produced by hydrothermal treatment of flavonoid tannin and subsequent carbonization at 1173 K, were tested as electrodes of supercapacitors. Four of these carbons were doped with nitrogen by putting tannin in contact with ammonia before or during the hydrothermal treatment. The pyrolyzed hydrothermal carbons had moderate surface areas, within the range 442-684 m2 g-1, and nitrogen contents ranging from 0.7 to 8.0 wt.%. Specific capacitances as high as 320 F g-1 and normalized capacitances as high as 58 ?F cm-2 were measured at 2 mV s-1. These performances are comparable with those obtained with high surface area-activated carbons, whereas, normalized capacitances values are among the highest ever reported. Mesostructuration, within the range 3-13 nm, of these materials appears to be a good strategy to improve their electrochem. performances at higher scan rates. We confirmed the beneficial role of oxygen up to 18 wt.%, while an optimum in nitrogen content exists from 3 to 6 wt.%. [on SciFinder(R)]

Equipe: Département CP2S : Chimie et électrochimie des matériaux

Braghiroli, F. L., Fierro, V., Szczurek, A., Stein, N., Parmentier, J. and Celzard, A.
Carbon, 90(0):63-74
2015

Resume: Abstract Aminated tannin submitted to hydrothermal treatment led to nitrogen-doped gels in the absence of any cross-linker. Such gels were subcritically dried, freeze-dried or supercritically dried to obtain organic xerogels, cryogels and aerogels, respectively, having nitrogen contents between 3.0 and 3.7 wt.%. After pyrolysis at 900 °C, the materials presented nitrogen contents ranging from 1.9 to 3.0 wt.%, and surface areas as high as 860, 754 and 585 m2 g?1 for carbon aerogels, cryogels and xerogels, respectively. All of them displayed micropores associated with different mesopore volumes, depending on both the drying method and initial dilution of the precursor. When tested as supercapacitor electrodes, these carbon gels presented outstanding specific and normalised capacitances, up to 387.6 F g?1 and 69.5 ?F cm?2, respectively, at a scan rate of 2 mV s?1 in 4 mol L?1 H2SO4 aqueous solution. These performances are higher than those obtained with high apparent surface area-activated carbons, as the measured capacitances are indeed among the highest ever reported. The influence of nitrogen- and oxygen-based moieties was investigated, and optimal N and O contents of 2–3 and 17–18 wt.%, respectively, were observed.

Equipe: Département CP2S : Chimie et électrochimie des matériaux

Chang, Taehoo, Cho, Sungmee, Kim, Jeongmin, Schoenleber, Jonathan, Frantz, Cedric, Stein, Nicolas, Boulanger, Clotilde and Lee, Wooyoung
Electrochimica Acta, 161:403-407
2015

Resume: In this study, we examd. individual bismuth telluride nanowires (NWs) electrodeposited in polycarbonate membranes (PCM) used as sacrificial templates. It has been demonstrated that the compn. of Bi2Te3 is controlled by the electrodeposition conditions, e.g. the applied potential. High-resoln. transmission electron microscopy (HRTEM) shows that the av. grain size of NWs increases with increasing Te content. Our results also reveal that the electrodeposited bismuth telluride NWs are n-type, and their elec. cond. increases with increasing Te content. These NWs also demonstrated a max. power factor of 195.8 mW/m·K2 for the Te-rich NW (d = 162 nm) at 300 K. [on SciFinder(R)]

Equipe: Département CP2S : Chimie et électrochimie des matériaux

Li, Shen, Chaput, Laurent, Stein, Nicolas, Frantz, Cedric, Lacroix, David and Termentzidis, Konstantinos
Applied Physics Letters, 106(23):233108
2015

Mots clefs: molecular dynamics method phonons thermal conductivity bismuth compounds nanowires

Equipe: Département CP2S : Chimie et électrochimie des matériaux

2014

Articles:

Sakly, Adnene, Kenzari, Samuel, Bonina, David, Corbel, Serge and Fournee, Vincent
MATERIALS & DESIGN, 56:280-285
2014
ISSN: 0261-3069

Equipe: Département CP2S : Métallurgie et Surfaces

Sakly, Adnene, Kenzari, Samuel, Bonina, David, Corbel, Serge and Fournee, Vincent
Materials & Design, 56:280--285
2014

Equipe: Centre de Compétences : Matériaux et Procédés additifs

Lambert, C-H., Mangin, S., Varaprasad, B.S.D.C.S., Takahashi, Y.K., Hehn, M., Cinchetti, M., Malinowski, G., Hono, K., Fainman, Y., Aeschlimann, M. and Fullerton, E.E.
Science,
2014

Equipe: Département P2M : Nanomagnétisme et Electronique de Spin

Aliev, F.G., Cascales, J.P., Hallal, A., Chshiev, M. and Andrieu, S.
Physical Review Letters, 112(21)
2014

Equipe: Département P2M : Nanomagnétisme et Electronique de Spin

ZHOU, T., COLIN, M., CANDOLFI, C., Boulanger, C., DAUSCHER, A., Santava, E., HEJTMANEK, J., BARANEK, P., AL RAHAL AL ORABI, R., POTEL, M., Fontaine, B., GOUGEON, P., Gautier, R. and LENOIR, B.
Chemistry of Materials, 26(16):4765-4775
2014

Resume: We present a detailed study of the evolution of the electrical, galvanomagnetic, and thermodynamic properties of polycrystalline AgxMo9Se11 compounds for 3.4 ? x ? 3.8 at low temperatures (2?350 K). In agreement with density functional theory calculations, the collected data show an overall gradual variation in the transport properties from metallic to semiconducting behavior on going from x = 3.4 to 3.8. The results evidence subtle variations in the electronic properties with the Ag content, typified by both positive and negative phonon-drag effects together with thermopower and Hall coefficient of opposite signs. Analysis of the data suggests that these features may be due to peculiarities of the dispersion of the valence bands in the vicinity of the chemical potential. A drastic influence of the Ag content on the thermal transport was evidenced by a pronounced change in the temperature dependence of the specific heat below 10 K. Nonlinearities in the Cp(T3) data are correlated to the concentration of Ag atoms, with an increase in x resulting in a more pronounced departure from a Debye law. The observed behavior mirrors that of ionic conductors, suggesting that AgxMo9Se11 for x ? 3.6 might belong to this class of compounds.

Equipe: Département CP2S : Chimie et électrochimie des matériaux

El Kaouini, Morad, Chatei, Hassan and Bougdira, Jamal
Physica Scripta, 2014(T161):014052
2014

Equipe: Département CP2S : Expériences et Simulations des Plasmas Réactifs - Interaction plasma-surface et Traitement des Surfaces ESPRITS

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