Aurelien Du Pasquier - Academia.edu (original) (raw)
Uploads
Papers by Aurelien Du Pasquier
ECS Meeting Abstracts, 2009
not Available.
ECS Meeting Abstracts, 2008
not Available.
Carbon, 2018
Carbon black additive, which combines high specific surface area and high purity, was designed to... more Carbon black additive, which combines high specific surface area and high purity, was designed to improve gravimetric capacitance and cycle life of electrochemical double layer capacitors. In this study, acid extraction method is employed to remove the impurities in the base carbon black (SC2) and the electrochemical performance of the product materials (SC2A) are evaluated in comparison with other commercially available conductive additives. Results suggest that carbon
Solar Energy Materials and Solar Cells, 2011
Stainless steel (SS) mesh was used to fabricate anodes for flexible dye sensitized solar cells (D... more Stainless steel (SS) mesh was used to fabricate anodes for flexible dye sensitized solar cells (DSSC) in order to evaluate them as replacements for more expensive Transparent Conductor Oxides (TCO's). SS mesh performance was analyzed and it was determined that oxidation of SS during the sintering of titania particles affects the transport and interface resistance of the device. Thus a thin layer of nonporous titania coating was added onto the mesh to protect the electrode from oxidation. Comparing with Fluorine doped Tin Oxide (FTO), SS mesh was found to have higher interface resistance but the overall series resistance was lower due to higher conductivity of metals. The effects of SS mesh opening size and microstructure on the performance of the device was analyzed and design strategies to obtain high efficiency flexible SS mesh DSSC are provided.
ACS Applied Materials & Interfaces, 2011
Highly crystalline mesoporous anatase TiO 2 is prepared through supramolecular self-assembly and ... more Highly crystalline mesoporous anatase TiO 2 is prepared through supramolecular self-assembly and by utilizing cetyltrimethylammonium bromide (CTAB) as templating material. Photoanodes of dye-sensitized solar cells (DSSCs) made from these TiO 2 nanoparticles are found to have a high specific surface area of 153 m 2 /g and high surface roughness. Optical absorption spectroscopy studies reveal that the photoanode films adsorb four times more dye than films made of commercial P25 TiO 2. Mercury porosimetry and field emission scanning electron microscope (FESEM) studies show hierarchical macro-and meso-porosity of the photoanode films leading to better dye and electrolyte percolation, combined with improved electron conduction pathways compared to P25 films. Electrochemical impedance studies confirm lower impedance and higher electron lifetime in the synthesized mesoporous TiO 2 films compared to P25 films. Higher photovoltaic efficiency was recorded of cells made from the synthesized mesoporous TiO 2 in comparison to the corresponding cells made from P25. Incident-photon-to-current efficiency data provided critical understanding of recombination kinetics, and provided proof of Mie scattering by the self-assembled submicrometer sized TiO 2 aggregates and the macropores in their structure. The scattering phenomenon was further corroborated by diffused reflectance studies. An in-depth analysis of CTABtemplated mesoporous TiO 2 has been conducted to show how it can be a good candidate photoanode material for enhancing the performance of DSSCs.
ECS Meeting Abstracts, 2008
performance of these cells at 60oC and 80oC was evaluated, with particular emphasis in separating... more performance of these cells at 60oC and 80oC was evaluated, with particular emphasis in separating the binder contribution from other parameters, such as cell residual water content and electrochemical testing protocols. Therefore, results that can be ascribed to the binder effect are shown, and supported by the mechanical and thermal behavior of the polymers in the presence of hot battery
J Power Sources, 2004
A 40 Wh/kg Li-ion battery using a Li 4 Ti 5 O 12 nanostructured anode and a composite activated c... more A 40 Wh/kg Li-ion battery using a Li 4 Ti 5 O 12 nanostructured anode and a composite activated carbon LiCoO 2 cathode was built using plastic Li-ion processing based on PVDF-HFP binder and soft laminate packaging. The specific power of the device is similar to that of an electrochemical double-layer supercapacitor (4000 W/kg). The high power is enabled by a combination of a nanostructured negative electrode, an acetonitrile based electrolyte and an activated carbon/LiCoO 2 composite positive electrode. This enables very fast charging (full recharge in 3 min). The effect of electrode formulation and matching ratio on energy, power and cycle-life are described. Optimization of these parameters led to a cycle-life of 20% capacity loss after 9000 cycles at full depth of discharge (DOD).
Applied Physics Letters, Dec 18, 2006
[Applied Physics Letters 89, 253513 (2006)]. Aurelien Du Pasquier, Hanhong Chen, Yicheng Lu. Abst... more [Applied Physics Letters 89, 253513 (2006)]. Aurelien Du Pasquier, Hanhong Chen, Yicheng Lu. Abstract. ... References. M.Grätzel, Photoelectrochemical cells, Nature (London) 414, 338 (2001). BO'Regan and MAGrätzel, Nature (London) 353, 737 (1991). ...
Journal of Electronic Materials, Apr 21, 2009
ABSTRACT We present a dye-sensitized solar cell (DSSC) using a nanostructured ZnO photoelectrode ... more ABSTRACT We present a dye-sensitized solar cell (DSSC) using a nanostructured ZnO photoelectrode and a gel electrolyte. The photoelectrode consists of well-aligned ZnO nanotips on a Ga-doped ZnO (GZO) transparent conducting film. The GZO film (400 nm, sheet resistance ~25 Ω/sq, transmittance over 85% in the visible wavelength) and ZnO nanotips (3.2 μm length) are sequentially grown on a glass substrate using metalorganic chemical vapor deposition. The ZnO photoelectrode is sensitized with dye N719 and impregnated with N-methyl pyrolidinone (NMP) gelled with poly(vinyl-difluoroethylene-hexafluoropropylene) copolymer (PVDF-HFP). The cell exhibits an open-circuit voltage of 726 mV and a power conversion efficiency of 0.89% under one sun illumination. The aging testing shows that the cell using a gel electrolyte has better stability than its liquid electrolyte counterpart.
J Electrochem Soc, 1999
Results The effect of various parameters, temperature, electrolyte salt compositions, and surface... more Results The effect of various parameters, temperature, electrolyte salt compositions, and surface area of the spinel on both the extent of the Mn dissolution and the electrochemical performance of LiMn2O4 powders upon storage into a Li-based electrolyte are presented ...
J Power Sources, 2009
ABSTRACT We report the effects of electrode thickness, cathode particle size and morphology, cath... more ABSTRACT We report the effects of electrode thickness, cathode particle size and morphology, cathode carbon coating matching ratio and laminate structure on the electrochemical characteristics of nanosized Li4Ti5O12–LiMn2O4 batteries. We show that a correct adjustment of these parameters resulted in significant improvements in power capability and cycle-life of such devices, making them competitive, low-cost and safe battery chemistry for next generation Li-ion batteries. In addition, Li4Ti5O12 reversible specific capacity beyond three Li-ions intercalation is reported.
MRS Proceedings, 2004
ABSTRACTThe introduction of propylene carbonate (PC) into the poly (3-alkyl)thiophenes (P3AT) pol... more ABSTRACTThe introduction of propylene carbonate (PC) into the poly (3-alkyl)thiophenes (P3AT) poly(octyl)thiophene (P3OT) and poly(hexyl)thiophene) (P3HT) is studied. In both cases, we observe a diminution of their melting temperature, which demonstrates a plasticizing effect. We also observe an increase of photovoltage and photocurrent in sandwich devices M//P3AT+PC//ITO-PET where M=Al, Mg and ITO-PET is Indium thin oxide coated on polyester. We attribute this effect to the introduction of oxygen from the PC. When mixed with an electron acceptor PCBM, the photocurrents only slightly increase and the photovoltages are similar. In this case, the presence of oxygen is detrimental to the system.
Powder Diffraction, 1999
The device developed here for XRD analysis is built on a Guinier–Lenné geometry camera. A monochr... more The device developed here for XRD analysis is built on a Guinier–Lenné geometry camera. A monochromatized and focused beam goes through the plastic Li-ion cell protected by a metal–plastic laminate. Each layer of the cell produces diffracted beams that are collected by an X-ray film on the focus circle. The film is continuously moved up (1–2 mm/h) while the Li-ion cell is charged and discharged, and controlled by means of the Mac-pile system. This system allows the control of intercalation rate either in potentiostatic mode or in galvanostatic mode (Mac Pile, Bio-Logic SA, Claix, France). The crystallographic behavior of both plastic electrodes can be simultaneously and continuously observed under the real conditions of a commercial battery. LixNiO2 and C graphite as positive and negative electrodes are given as an example, respectively. Structural and chemical parameters evolving from the two electrodes can easily be correlated with the cycling curves. Studies can also be performed...
Advanced Energy Materials, 2011
Abstract TiCl 4 surface treatment studies of porous electrode structure of TiO 2 aggregates synth... more Abstract TiCl 4 surface treatment studies of porous electrode structure of TiO 2 aggregates synthesized using an acidic precursor and CTAB as a templating agent are carried out in order to understand and improve upon recombination kinetics in the photonanode film matrix, together with enhancing the intrinsic light scattering. The key beneficial features of the photoanode included high surface roughness, necessary for superior dye adsorption, nanocrystallite aggregates leading to diffuse light scattering within the film matrix, and a ...
ECS Meeting Abstracts, 2009
not Available.
ECS Meeting Abstracts, 2008
not Available.
Carbon, 2018
Carbon black additive, which combines high specific surface area and high purity, was designed to... more Carbon black additive, which combines high specific surface area and high purity, was designed to improve gravimetric capacitance and cycle life of electrochemical double layer capacitors. In this study, acid extraction method is employed to remove the impurities in the base carbon black (SC2) and the electrochemical performance of the product materials (SC2A) are evaluated in comparison with other commercially available conductive additives. Results suggest that carbon
Solar Energy Materials and Solar Cells, 2011
Stainless steel (SS) mesh was used to fabricate anodes for flexible dye sensitized solar cells (D... more Stainless steel (SS) mesh was used to fabricate anodes for flexible dye sensitized solar cells (DSSC) in order to evaluate them as replacements for more expensive Transparent Conductor Oxides (TCO's). SS mesh performance was analyzed and it was determined that oxidation of SS during the sintering of titania particles affects the transport and interface resistance of the device. Thus a thin layer of nonporous titania coating was added onto the mesh to protect the electrode from oxidation. Comparing with Fluorine doped Tin Oxide (FTO), SS mesh was found to have higher interface resistance but the overall series resistance was lower due to higher conductivity of metals. The effects of SS mesh opening size and microstructure on the performance of the device was analyzed and design strategies to obtain high efficiency flexible SS mesh DSSC are provided.
ACS Applied Materials & Interfaces, 2011
Highly crystalline mesoporous anatase TiO 2 is prepared through supramolecular self-assembly and ... more Highly crystalline mesoporous anatase TiO 2 is prepared through supramolecular self-assembly and by utilizing cetyltrimethylammonium bromide (CTAB) as templating material. Photoanodes of dye-sensitized solar cells (DSSCs) made from these TiO 2 nanoparticles are found to have a high specific surface area of 153 m 2 /g and high surface roughness. Optical absorption spectroscopy studies reveal that the photoanode films adsorb four times more dye than films made of commercial P25 TiO 2. Mercury porosimetry and field emission scanning electron microscope (FESEM) studies show hierarchical macro-and meso-porosity of the photoanode films leading to better dye and electrolyte percolation, combined with improved electron conduction pathways compared to P25 films. Electrochemical impedance studies confirm lower impedance and higher electron lifetime in the synthesized mesoporous TiO 2 films compared to P25 films. Higher photovoltaic efficiency was recorded of cells made from the synthesized mesoporous TiO 2 in comparison to the corresponding cells made from P25. Incident-photon-to-current efficiency data provided critical understanding of recombination kinetics, and provided proof of Mie scattering by the self-assembled submicrometer sized TiO 2 aggregates and the macropores in their structure. The scattering phenomenon was further corroborated by diffused reflectance studies. An in-depth analysis of CTABtemplated mesoporous TiO 2 has been conducted to show how it can be a good candidate photoanode material for enhancing the performance of DSSCs.
ECS Meeting Abstracts, 2008
performance of these cells at 60oC and 80oC was evaluated, with particular emphasis in separating... more performance of these cells at 60oC and 80oC was evaluated, with particular emphasis in separating the binder contribution from other parameters, such as cell residual water content and electrochemical testing protocols. Therefore, results that can be ascribed to the binder effect are shown, and supported by the mechanical and thermal behavior of the polymers in the presence of hot battery
J Power Sources, 2004
A 40 Wh/kg Li-ion battery using a Li 4 Ti 5 O 12 nanostructured anode and a composite activated c... more A 40 Wh/kg Li-ion battery using a Li 4 Ti 5 O 12 nanostructured anode and a composite activated carbon LiCoO 2 cathode was built using plastic Li-ion processing based on PVDF-HFP binder and soft laminate packaging. The specific power of the device is similar to that of an electrochemical double-layer supercapacitor (4000 W/kg). The high power is enabled by a combination of a nanostructured negative electrode, an acetonitrile based electrolyte and an activated carbon/LiCoO 2 composite positive electrode. This enables very fast charging (full recharge in 3 min). The effect of electrode formulation and matching ratio on energy, power and cycle-life are described. Optimization of these parameters led to a cycle-life of 20% capacity loss after 9000 cycles at full depth of discharge (DOD).
Applied Physics Letters, Dec 18, 2006
[Applied Physics Letters 89, 253513 (2006)]. Aurelien Du Pasquier, Hanhong Chen, Yicheng Lu. Abst... more [Applied Physics Letters 89, 253513 (2006)]. Aurelien Du Pasquier, Hanhong Chen, Yicheng Lu. Abstract. ... References. M.Grätzel, Photoelectrochemical cells, Nature (London) 414, 338 (2001). BO'Regan and MAGrätzel, Nature (London) 353, 737 (1991). ...
Journal of Electronic Materials, Apr 21, 2009
ABSTRACT We present a dye-sensitized solar cell (DSSC) using a nanostructured ZnO photoelectrode ... more ABSTRACT We present a dye-sensitized solar cell (DSSC) using a nanostructured ZnO photoelectrode and a gel electrolyte. The photoelectrode consists of well-aligned ZnO nanotips on a Ga-doped ZnO (GZO) transparent conducting film. The GZO film (400 nm, sheet resistance ~25 Ω/sq, transmittance over 85% in the visible wavelength) and ZnO nanotips (3.2 μm length) are sequentially grown on a glass substrate using metalorganic chemical vapor deposition. The ZnO photoelectrode is sensitized with dye N719 and impregnated with N-methyl pyrolidinone (NMP) gelled with poly(vinyl-difluoroethylene-hexafluoropropylene) copolymer (PVDF-HFP). The cell exhibits an open-circuit voltage of 726 mV and a power conversion efficiency of 0.89% under one sun illumination. The aging testing shows that the cell using a gel electrolyte has better stability than its liquid electrolyte counterpart.
J Electrochem Soc, 1999
Results The effect of various parameters, temperature, electrolyte salt compositions, and surface... more Results The effect of various parameters, temperature, electrolyte salt compositions, and surface area of the spinel on both the extent of the Mn dissolution and the electrochemical performance of LiMn2O4 powders upon storage into a Li-based electrolyte are presented ...
J Power Sources, 2009
ABSTRACT We report the effects of electrode thickness, cathode particle size and morphology, cath... more ABSTRACT We report the effects of electrode thickness, cathode particle size and morphology, cathode carbon coating matching ratio and laminate structure on the electrochemical characteristics of nanosized Li4Ti5O12–LiMn2O4 batteries. We show that a correct adjustment of these parameters resulted in significant improvements in power capability and cycle-life of such devices, making them competitive, low-cost and safe battery chemistry for next generation Li-ion batteries. In addition, Li4Ti5O12 reversible specific capacity beyond three Li-ions intercalation is reported.
MRS Proceedings, 2004
ABSTRACTThe introduction of propylene carbonate (PC) into the poly (3-alkyl)thiophenes (P3AT) pol... more ABSTRACTThe introduction of propylene carbonate (PC) into the poly (3-alkyl)thiophenes (P3AT) poly(octyl)thiophene (P3OT) and poly(hexyl)thiophene) (P3HT) is studied. In both cases, we observe a diminution of their melting temperature, which demonstrates a plasticizing effect. We also observe an increase of photovoltage and photocurrent in sandwich devices M//P3AT+PC//ITO-PET where M=Al, Mg and ITO-PET is Indium thin oxide coated on polyester. We attribute this effect to the introduction of oxygen from the PC. When mixed with an electron acceptor PCBM, the photocurrents only slightly increase and the photovoltages are similar. In this case, the presence of oxygen is detrimental to the system.
Powder Diffraction, 1999
The device developed here for XRD analysis is built on a Guinier–Lenné geometry camera. A monochr... more The device developed here for XRD analysis is built on a Guinier–Lenné geometry camera. A monochromatized and focused beam goes through the plastic Li-ion cell protected by a metal–plastic laminate. Each layer of the cell produces diffracted beams that are collected by an X-ray film on the focus circle. The film is continuously moved up (1–2 mm/h) while the Li-ion cell is charged and discharged, and controlled by means of the Mac-pile system. This system allows the control of intercalation rate either in potentiostatic mode or in galvanostatic mode (Mac Pile, Bio-Logic SA, Claix, France). The crystallographic behavior of both plastic electrodes can be simultaneously and continuously observed under the real conditions of a commercial battery. LixNiO2 and C graphite as positive and negative electrodes are given as an example, respectively. Structural and chemical parameters evolving from the two electrodes can easily be correlated with the cycling curves. Studies can also be performed...
Advanced Energy Materials, 2011
Abstract TiCl 4 surface treatment studies of porous electrode structure of TiO 2 aggregates synth... more Abstract TiCl 4 surface treatment studies of porous electrode structure of TiO 2 aggregates synthesized using an acidic precursor and CTAB as a templating agent are carried out in order to understand and improve upon recombination kinetics in the photonanode film matrix, together with enhancing the intrinsic light scattering. The key beneficial features of the photoanode included high surface roughness, necessary for superior dye adsorption, nanocrystallite aggregates leading to diffuse light scattering within the film matrix, and a ...