References of "Krins, Natacha"
     in
Bookmark and Share    
Full Text
Peer Reviewed
See detailStability of templated and nanoparticles dye-sensitized solar cells : photovoltaic and electrochemical investigation of degradation mechanisms at the photoelectrode interface
Dewalque, Jennifer ULg; Nguyen, Ngoc Duy ULg; Colson, Pierre ULg et al

in Electrochimica Acta (2014), 115(1), 478-486

A key issue in the commercialization of dye-sensitized solar cells is to maintain high efficiency and long lifetime. As reported in the literature, dye-sensitized solar cells are stable under visible ... [more ▼]

A key issue in the commercialization of dye-sensitized solar cells is to maintain high efficiency and long lifetime. As reported in the literature, dye-sensitized solar cells are stable under visible light soaking but thermal stress and UV exposure lead to efficiency degradation. However, all the stability studies published so far have been performed on cells whose TiO2 electrodes were prepared by tape casting or screen printing of nanoparticle pastes/inks. The present study concerns cells based on highly porous templated TiO2 electrodes, whose larger surface area could enhance the negative effects of thermal stress, light soaking and UV exposure. The long-term stability of these cells is compared with a classical nanoparticle-based cell using current-voltage measurements (I-V curves) and electrochemical impedance spectroscopy. Due to their higher active interface, templated cells are more sensitive than nanoparticle cells to UV illumination, although this can be easily solved in both cases by the use of a UV filter. The templated cells are as stable as the nanoparticle cells under visible light soaking (UV filtered). However, we showed that templated cells are more stable under thermal stress. Moreover, as evidenced by electrochemical impedance spectroscopy, templated cells show lower transfer resistance, as well as lower recombination resistance compared to nanoparticle cells. The crystallite connectivity promoted by the templating route seems to favor the electron transfers inside the porous layer. Using templated films in dye-sensitized solar cells is therefore really promising because higher conversion efficiencies are reached without promoting cell degradation. [less ▲]

Detailed reference viewed: 61 (13 ULg)
See detailAnatase TiO2 colloidal nanocrystal-based architectures: models to assess the role of porosity and nanocrystal morphology in Li battery electrode
Krins, Natacha ULg; Buonsanti, Raffaella; Kim, Chunjoong et al

Conference (2013, October 30)

Detailed reference viewed: 4 (1 ULg)
See detailFacile Encapsulation of Sn nanocrystals in GeS2 Matrix for High-Performance Lithium-ion Battery Anodes
Singh, Ajay; Krins, Natacha ULg; Milliron, Delia J.

Poster (2013, August 05)

Detailed reference viewed: 17 (0 ULg)
See detailAnatase TiO2 colloidal nanocrystal-based architectures: models to assess the role of porosity and NCs morphology in Li battery electrode
Krins, Natacha ULg; Buonsanti, Raffaella; Kim, Chunjoong et al

Poster (2013, May 03)

Detailed reference viewed: 7 (1 ULg)
See detailPrecisely controlled mesoporous films to assess the role of architecture in nanocrystal-.based electrodes for Li-ion batteries
Krins, Natacha ULg; Buonsanti, Raffaella; Shukla, Alpesh K. et al

Poster (2013, March 04)

Detailed reference viewed: 10 (1 ULg)
Full Text
Peer Reviewed
See detailEffect of freeze-drying and self-ignition process on the microstructural and electrochemical properties of Li4Ti5O12
Jamin, Claire ULg; Traina, Karl; Eskenazi, David ULg et al

in Materials Research Bulletin (2013), 48

Crystalline Li4Ti5O12 is synthesized by a method involving the freeze-drying and self-ignition of a gel prepared from titanium isopropoxide, lithium nitrate and hydroxypropylmethylcellulose (HPMC). This ... [more ▼]

Crystalline Li4Ti5O12 is synthesized by a method involving the freeze-drying and self-ignition of a gel prepared from titanium isopropoxide, lithium nitrate and hydroxypropylmethylcellulose (HPMC). This synthesis route yields crystalline Li4Ti5O12 particles after calcination at 800°C for 2 h. In an alternative route, addition of ammonium nitrate shifts the self-ignition mode from wave-like propagation to simultaneous. Powders with different microstructures are thereby obtained. Electrochemical characterization shows that the best results for Li+ intercalation/desintercalation are obtained for the powder prepared without ammonium nitrate addition. These results highlight the necessity for a control of the self-ignition mode to obtain adequate properties. [less ▲]

Detailed reference viewed: 30 (9 ULg)
Full Text
Peer Reviewed
See detailLithium transition metal (Ti, Nb, V) oxide mesoporous thin films: contrasting results when attempting direct synthesis by evaporation-induced self assembly
Caes, Sébastien ULg; Malherbe, Cédric ULg; Krins, Natacha ULg et al

in Microporous & Mesoporous Materials (2013), 172

This work investigates the possibility to prepare mesoporous thin films of Li-Ti, Li-Nb, Li-Nb-V and Li-V oxides through a direct sol-gel EISA route by dissolving a lithium salt in the precursor solution ... [more ▼]

This work investigates the possibility to prepare mesoporous thin films of Li-Ti, Li-Nb, Li-Nb-V and Li-V oxides through a direct sol-gel EISA route by dissolving a lithium salt in the precursor solution. Experimental conditions involve a hydrolysis molar ratio H2O/TM ~10 (TM = Ti,Nb,V) and the common Pluronic structuring agent P123 (EO20-PO70-EO20). Systematic formation of lithium-containing oxides as first-crystallizing phases points to a significant intermixture of lithium and transition metal ions in the inorganic network. In the case of Ti-based and Nb-based oxide films, addition of lithium to the precursor solution is compatible with the formation of amorphous mesoporous films at 350°C. On the contrary, addition of lithium has a detrimental effect on the notoriously difficult formation of vanadium-based mesostructured films: even when replacing half of the vanadium by niobium as a stabilizer, formation of mesostructured films has not been possible in the investigated range of experimental conditions. [less ▲]

Detailed reference viewed: 52 (30 ULg)
Full Text
Peer Reviewed
See detailAssembly of Ligand-Stripped Nanocrystals into Precisely Controlled Mesoporous Architectures
Buonsanti, R.; Pick, T. E.; Krins, Natacha ULg et al

in Nano Letters (2012), 12

Detailed reference viewed: 12 (2 ULg)
See detailUse colloidal nanocrystals for Li ion battery on the way to 3D architectured electrodes
Krins, Natacha ULg; Buonsanti, Raffaella; Richardson, Thomas J. et al

Conference (2012)

Detailed reference viewed: 2 (0 ULg)
See detailAssessing the role of pore structure and porosity in composite electrodes through model thin film electrode studies
Krins, Natacha ULg; Shukla, Alpesh K.; Milliron, Delia J. et al

Poster (2012)

Detailed reference viewed: 7 (0 ULg)
See detailAssessing the role of porosity in composite electrodes through model thin film electrode studies
Krins, Natacha ULg; Shukla, Alpesh K.; Milliron, Delia J. et al

Poster (2012)

Detailed reference viewed: 4 (0 ULg)
See detailAssessing the role of porosity in composite electrodes through model thin film electrode studies
Krins, Natacha ULg; Shukla, Alpesh K.; Milliron, Delia J. et al

Poster (2012)

Detailed reference viewed: 2 (0 ULg)
See detailPrecisely controlled mesoporous films to assess the role of architecture in Li‐ion batteries
Krins, Natacha ULg; Buonsanti, Raffaella; Shukla, Alpesh K. et al

Poster (2012)

Detailed reference viewed: 6 (0 ULg)
Full Text
Peer Reviewed
See detailMicrostructural evolution of a TiO2 mesoporous single layer film under calcination: Effect of stabilization and repeated thermal treatments on the film crystallization and surface area
Dewalque, Jennifer ULg; Cloots, Rudi ULg; Dubreuil, Olivier et al

in Thin Solid Films (2012), 520

This study quantifies the highest perturbation encountered by the first layer of a TiO2 12 layers-mesoporous coating, which is submitted to a multistep calcination process. Besides, we propose an ... [more ▼]

This study quantifies the highest perturbation encountered by the first layer of a TiO2 12 layers-mesoporous coating, which is submitted to a multistep calcination process. Besides, we propose an alternative thermal treatment in order to limit the degradation induced by repeated calcinations. This paper reports and compares the modifications in film thickness, surface area, anatase crystallite size and global crystallinity of films obtained from different thermal treatments. It defines the maximum crystal size compatible with the preservation of the mesoarchitecture initially induced by templating. Differences in microporosity and rate of crystallization are also discussed. [less ▲]

Detailed reference viewed: 58 (18 ULg)
Full Text
Peer Reviewed
See detailDirect nano-in-micropatterning of TiO2 thin layers and TiO2/Pt nanoelectrode arrays by deep X-ray lithography
Faustini, M.; Marmiroli, B.; Malfatti, L. et al

in Journal of Materials Chemistry (2011), 21

Detailed reference viewed: 4 (1 ULg)
Full Text
Peer Reviewed
See detailUnderstanding Crystallization of Anatase into Binary SiO2/TiO2 Sol-Gel Optical Thin Films: An in Situ Thermal Ellipsometry Analysis
Louis, B.; Krins, Natacha ULg; Faustini, M. et al

in Journal of Physical Chemistry C: Nanomaterials, Interfaces, and Hard Matter (2011), 115

Detailed reference viewed: 6 (3 ULg)
Full Text
Peer Reviewed
See detailMesoporous SiO2 thin films containing ZnO photoluminescent nanoparticles. Simultaneous SAXS / WAXS / Ellipsometry investigations
Krins, Natacha ULg; Bass, J. D.; Julián-López, B. et al

in Journal of Materials Chemistry (2011), 21

Detailed reference viewed: 3 (1 ULg)
See detailThick and crack-free nanocrystalline mesoporous TiO2 films obtained by capillary coating from aqueous solutions
Krins, Natacha ULg; Faustini, Marco; Louis, Benjamin et al

Poster (2011)

Detailed reference viewed: 3 (0 ULg)