Pascal Roussel

Pascal Roussel
Université de Lille · Unité de Catalyse et Chimie du Solide (UCCS)

CNRS Research Director

About

454
Publications
53,146
Reads
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6,117
Citations
Additional affiliations
September 2000 - present
French National Centre for Scientific Research
Position
  • Research Director
September 2000 - present
Université de Lille
Position
  • CNRS Research Director
January 2000 - October 2013
National Graduate School of Engineering Chemistry of Lille (ENSCL)
Position
  • CNRS Research Director

Publications

Publications (454)
Article
Full-text available
The ultimate mechanical properties of MgSiO3 orthoenstatite (OEN), as characterized here by the ideal strengths, have been calculated under tensile and shear loadings using first-principles calculations. Both ideal tensile strength (ITS) and shear strength (ISS) are computed by applying homogeneous strain increments along high-symmetry directions (...
Article
Due to its great theoretical capacity (147 mAh g−1) and high operating potential (4.7 V vs Li+/Li), Co‐free spinel LiNi0.5Mn1.5O4 (LNMO) is one of the most promising thin film cathodes allowing designing Li‐ion micro‐batteries with a high specific energy. In this work, the Li extraction–insertion mechanism in sputtered LNMO thin films is investigat...
Article
The solid-state organization of hole and electron transporting layers plays an important role in governing the performance and stability of emerging optoelectronic devices such as perovskite solar cells (PSCs). The molecular organic semiconductor (OSC) 2,2″,7,7″-tetrakis [N,N-di(4-methoxyphenyl)amino]-9,9′-spirobifluorene (spiro-OMeTAD) is a promis...
Article
To power the next generation of miniaturized electronic devices, the energy storage capability of Li-ion micro-batteries must be significantly improved and the fabrication of high-performance 3D electrodes is mandatory. Here we show how to carefully match the design of efficient 3D scaffold based on metallic porous template with the deposition para...
Cover Page
Full-text available
In‐Situ Cycling In article number 2100891, Demortiére and co‐workers demonstrate that in‐situ cycling of a LiMn1.5Ni0.5O4 thin‐film cathode in an electrochemical transmission electron microscope (TEM) holder reveals structural and morphologic changes upon (de)lithiation processes. (S)TEM images of the cycled thin‐film reveal the formation of voids,...
Article
Miniaturized electronics suffer from a lack of energy autonomy. In that context, the fabrication of lithium‐ion solid‐state microbatteries with high performance is mandatory for powering the next generation of portable electronic devices. Here, the fabrication of a thin film positive electrode for 3D Li‐ion microbatteries made by the atomic layer d...
Article
In this article we demonstrate that in-situ cycling of a LiMn1.5Ni0.5O4 thin-film cathode in an electrochemical transmission electron microscope (TEM) holder reveals structural and morphologic changes upon (de)lithiation processes. (S)TEM images of the cycled thin-film reveal the formation of voids, cracks, and organic decomposition products. The 4...
Article
Two new oxyfluorides with a pyrochlore-type structure, Na 2 Nb 2 O 5 F 2 and Na 2 Ta 2 O 5 F 2 , have been obtained and for which the XRD crystallographic study coupled with ¹⁹ F solid state NMR reveals an unusual O/F...
Article
Micro-batteries are attractive miniaturized energy devices for new Internet of Things applications, but the lack of understanding of their degradation process during cycling hinders improving their performance. Here focused ion beam (FIB)-lamella from LiMn1.5Ni0.5O4 (LMNO) thin-film cathode is in situ cycled in a liquid electrolyte inside an electr...
Article
The chain shuttling ring-opening copolymerization of l-lactide with ε-caprolactone has been achieved using two aluminum catalysts presenting different selectivities and benzyl alcohol as chain transfer agent. A newly synthesized aminobisphenolate supported aluminum complex affords the synthesis of lactone rich poly(l-lactide-co-lactone) statistical...
Article
Ceria (CeO2) is known as a refractory oxide for dissolution in nitric acid, since the leaching reaction is thermodynamically unfavorable, except when it is complexed by nitrates but with very slow kinetics. To enhance dissolution, surface activation was achieved using high-energy milling. With the mechanically-activated cerium oxide, leaching in ni...
Article
In this paper, we fabricated silicon nanowire-TiO2 core-shell arrays in a two-step process. First, silicon nanowire arrays (SiNW) were prepared in HF/AgNO3 aqueous solution using metal-assisted chemical etching of bulk silicon. Then, atomic layer deposition (ALD) technique was applied to coat a 20 nm thin shell TiO2 film. The TiO2/SiNW substrates w...
Article
Nitrogen‐co‐doped MoS2@rGO composites (named hereafter N‐MoS2@N‐RGO) are prepared by the hydrothermal method using dicyandiamide or hydrazine monohydrate as the nitrogen source. N‐MoS2@rGO is obtained by the hydrothermal reaction of thioacetamide, ammonium molybdate and GO precursors in the presence of dicyandiamide, while N‐MoS2@N‐RGO is synthesiz...
Article
Electrochemical energy storage (EES) devices that provide high power and energy for micropower systems are considered to be essential for developing micro/nano electronics such as nanorobotics, environmental sensors, and connected smart electronics. One promising research direction in this field has been to develop on-chip EES devices whose length...
Article
To power the next generation of miniaturized electronic devices, 3D micro-supercapacitors are a new class of millimeter scale electrochemical capacitors with superior storage performance than their planar counterparts. Nevertheless, it is mandatory to carefully match the dimensions of the 3D scaffold with the thickness of the electrochemically acti...
Article
Full-text available
LiNi0.5Mn1.5O4 (LNMO) is a promising 5V-class electrode for Li-ion batteries but suffers from manganese dissolution and electrolyte decomposition owing to the high working potential. An attractive solution to stabilize the surface chemistry consists in mastering the interface between the LNMO electrode and the liquid electrolyte with a surface prot...
Article
The next generation of Internet of Things devices requires micro-supercapacitors operating at high voltage which is difficult to achieve using symmetrical design. Thus, their fabrication in an asymmetric configuration is mandatory. While MnO2 is well-established as positive electrode, the scarcity of existing efficient materials able to be used at...
Article
Research on micro-supercapacitors remains one of the most important activities in the area of electrochemical energy storage for powering smart and miniaturized electronic devices. Here we design an asymmetric micro-supercapacitor (A-MSC) combining sputtered vanadium nitride film (VN) and electrodeposited hydrous ruthenium oxide (hRuO2) film. Takin...
Article
A new salt, 4-aminopyridinium 3-(4-aminopyridinium) succinate tetra hydrate was synthesized from 4-aminopyridine and maleic acid in 2:1 stoichiometric ratio. The salt was characterised using single crystal X-ray diffraction, Raman scattering and DSC/DTA techniques. Intermolecular interactions in the salt investigated through Hirshfeld surfaces and...
Article
The low mass activity and high price of pure platinum (Pt)-based catalysts predominantly limit their large-scale utilization in electrocatalysis. Therefore, the reduction of Pt amount while preserving the electrocatalytic efficiency represents a viable alternative. In this work, we prepared new PtRu2 nanoparticles supported on sulphur and nitrogen...
Article
Crystallization pathways of BaOCaO-Al2O3-SiO2 (BCAS) glass were determined as a function of time and temperature, using a set of adapted and in-situ characterization techniques such as differential thermal analysis, high-temperature X-ray diffraction, nuclear magnetic resonance and high-temperature environmental scanning electron microscopy. Glass...
Article
The contamination of water by synthetic organic molecules and trace metals is a growing challenge, in spite of the enormous research efforts being made in the field of water treatment. In this study, reduced graphene oxide-copper sulphide (rGO-CuS) nanocomposites of different rGO/CuS (2/1, 1/1, 1/2) molar ratios were fabricated via a facile one-ste...
Article
Taking advantage of strain engineering, Nd2WO6 (NdWO) thin films have been successfully grown on (001)-oriented SrTiO3 single-crystal substrates by pulsed-laser deposition. Highresolution X-ray diffraction characterizations highlight the stabilization of a new orthorhombic (Pm21n) NdWO polymorphic form, isostructural to α-La2WO6. Reciprocal space m...
Article
Taking advantage of strain engineering, Nd2WO6 (NdWO) thin films have been successfully grown on (001)-oriented SrTiO3 single-crystal substrates by pulsed laser deposition. High-resolution X-ray diffraction characterizations highlight the stabilization of a new orthorhombic (Pm21n) NdWO polymorphic form, isostructural to α-La2WO6. Reciprocal Space...
Article
Full-text available
The synthesis and characterization of the novel ferrocenyl sulfonyl hydrazide [Fe(η5-C5H5){(η5-C5H4)-S(O)2-NH-NH2}] (2) is reported. Additional studies on its reactivity in front of acetone or the ferrocenyl-, cyrhetrenyl- or cymantrenyl- aldehydes have allowed us to isolate and characterize: [Fe(η5-C5H5){(η5-C5H4)-S(O)2-NH-N=CMe2}] (3), the bis(fe...
Article
Herein, we investigated the influence of Fe, Cr and Al incorporation in Ni-based layered double hydroxides (LDHs) supported on nickel foam (NF) electrodes, prepared through a one-step hydrothermal, on their electrochemical performance. The resulting NiFe, NiCr and NiAl (LDHs) were further coated on carbon spheres (CS) supported on NF using a facile...
Article
The synthesis and characterization of the novel ferrocenyl sulfonyl hydrazide [Fe(η5-C5H5){(η5-C5H4)–S(O)2–NH–NH2}] (2) is reported. Additional studies on its reactivity using acetone or the ferrocenyl-, cyrhetrenyl- or cymantrenyl-aldehydes have allowed us to isolate and characterize [Fe(η5-C5H5){(η5-C5H4)–S(O)2–NH–N[double bond, length as m-dash]...
Article
Herein, an integrated system combining solar cells with a hybrid supercapacitor device for operating a homemade windmill device was assembled, achieving energy conversion, storage and utilization. As a candidate for positive electrode of hybrid supercapacitor devices, battery-like Ni(OH)2@[email protected] binder-free electrode was fabricated by a...
Article
The electrochemical performance of La0.5Sr1.5MnO4±δ (L5S15M) in reducing atmosphere was investigated using Electrochemical Impedance Spectroscopy (EIS) measurements on Au/L5S15M/GDC/YSZ/GDC/L5S15M/Au symmetrical cell. In this research, the electrochemical performance of symmetrical cells sintered at different temperatures cells was evaluated in var...
Article
New electrode composite materials consisting of NiMnCr Layered Double Hydroxides (LDHs) coated on carbon spheres (CS) supported on nickel foam (NiMnCr [email protected]/NF) were synthesized using a two step hydrothermal process. The obtained binder-free NiMnCr [email protected]/NF composite was investigated as a positive electrode for supercapacito...
Article
Mixed-anion compounds are among the most promising systems to design functional materials with enhanced properties. In particular, heteroleptic environments around transition metals allow tuning of the polarity or band-gap engineering for instance. We present the original oxysulfide Ba5(VO2S2)2(S2)2, the fifth member in the quaternary system Ba-V-S...
Article
Two polytypes of the new oxyvanadate matrix La7O6(VO4)3 were identified and deeply characterized. The crystal structure of the α-polytype was solved using a combination of precession electron diffraction and powder X-ray diffraction (XRD) techniques. It crystallizes in a monoclinic unit cell with space group P21, a = 13.0148(3) Å, b = 19.1566(5) Å,...
Article
Full-text available
The Internet of Things, enabled by a worldwide network of interconnected sensors, is limited in its large-scale deployment of nomadic miniaturized devices due to the bounds of energy self-sufficiency. One possible solution, albeit challenging, is constructing on-chip pseudocapacitive micro-supercapacitors. Herein, we achieve the collective fabricat...
Article
We unveil the structure and investigate the visible light water-splitting of the photocatalyst α-LaOInS2, the second polymorph in this composition. This remarkable oxysulfide exhibits rare mixed anion InS5O octahedra leading to both O-2p and S-3p hybridized with indium states in the vicinity of the Fermi level. Ab initio structure prediction shows...
Article
We unveil the structure and investigate the visible light water-splitting photocatalyst α-LaOInS 2 , the second polymorph in this composition. This remarkable oxysulfide exhibits rare mixed anion InS 5 O octahedra leading to both...
Article
Full-text available
A new heterostructured titanium–iron-based material dispersed in alkaline muscovite (Ti–Fe–Mus) was synthesized by a typical impregnation process, and characterized by X-ray diffraction, adsorption/desorption of liquefied nitrogen and thermogravimetric/differential thermal analysis. This characterization suggests that the Ti–Fe–Mus system does not...
Article
The novel 2-hydroxy-benzaldehyde-ferrocenyl-sulfonylhydrazone ligand [(η⁵-C5H5)Fe(η⁵-C5H4SO2NH-NCH-C6H4-2-OH)] (HL) and its nickel(II), palladium(II) and copper(II) complexes (1a–c) have been synthesized. All compounds were characterized using conventional spectroscopic and analytical techniques (infrared, ¹H and ¹³C NMR, mass spectrometry and elem...
Article
Full-text available
Anhydrous phase B and stishovite formed directly from olivine in experiments at 14 GPa and 1400 °CThe structure of anhydrous phase B is determined ab initio from precession electron diffraction tomography in transmission electron microscopyElastic and seismic properties of anhydrous phase B are calculated. ©2019. The Authors.
Article
La4BaCu5-xMnxO13+δ materials have been synthesized by the sol-gel method in air and studied as possible electrode materials for symmetrical Solid Oxide Fuel Cells (S-SOFC). Within the series, La4BaMn5O13+δ (LBMn) exhibits an excellent stability in reducing atmosphere and remarkable redox stability, although a structure transition from rhombohedral...
Article
An original way to perform the exsolution of Ni nanoparticles on a ceramic support was explored for the development of methane steam reforming catalyst in SOFC anode conditions. The n=2 Ruddlesden‐Popper (RP) phase La1.5Sr1.5Mn1.5Ni0.5O7 has been synthesized by the Pechini method and subsequently reduced with an H2‐N2 mixture at different temperatu...
Article
A thorough study of the Y1-XZrxMnO3+δ series is presented with the objective to use those materials as SOFC cathode. These pure and Zr-doped yttrium manganites exhibit a layered hexagonal structure associated to a peculiar 5-fold bi-pyramidal coordination of manganese that makes it intrinsically different from the traditional cubic-like perovskite...
Article
Ln 2 Ti 2 O 7 thin films with Ln = La to Lu were successfully grown on (110)-SrTiO 3 substrates by pulsed laser deposition. The microstructure and optical properties of the entire Ln 2 Ti 2 O 7 series were investigated by X-Ray diffraction, atomic force microscopy, scanning transmission electron microscopy coupled with energy-dispersive X-ray spect...
Article
Full-text available
The formation of thin film electrode exhibiting high capacity and high rate capabilities is challenging in the field of miniaturized electrochemical energy storage. Here, we present an elegant strategy to tune the morphology and the properties of sputtered porous Nb2O5 thin films deposited on Si-based substrates via magnetron sputtering deposition...
Article
Micro-supercapacitors, a class of miniaturized electrochemical capacitors, are an attractive solution to power smart and connected sensors for Internet of Thing (IoT)applications. Unfortunately, to propose on chip micro-supercapacitors with high technological readiness level, the deposition of electrode materials on large-scale substrate is challen...
Article
The continuous increase of small electronic devices calls for small energy storage components, commonly known as micro-supercapacitors, that can ensure autonomous operation of these devices. In this work, we propose a simple and straightforward method to achieve high energy and power densities of a silicon-based micro-supercapacitor, consisting of...
Article
The electrochemical performance of La0.5Sr1.5MnO4±δ (L5S15 M) as SOFC cathode was studied using Electrochemical Impedance Spectroscopy (EIS) measurements. The influence of the sintering temperature on the electrochemical performance was examined in air for Au/L5S15 M/GDC/YSZ/GDC/L5S15 M/Au symmetrical cell. For the oxygen reduction reaction, the el...
Article
High-performance electrode materials consisting of intertwined caterpillar-like NiFe layered double hydroxide bridges coated on reduced graphene oxide modified Ni foam (NiFe LDHs/rGO/NF) were prepared via a facile two-step electrodeposition method. First, rGO was electrochemically coated onto NF at a constant potential of −1.2 V vs. SCE for 600 s....
Article
Full-text available
We report on the identification and survey of the Pb 4 Ln 2 O 7 series (Ln = La, Gd, Sm and Nd) which turn out to be real van der Waals 2D oxides. In the neutral layers, strong covalent Pb-O bonds together with external stereoactive Pb ²⁺ lone pairs, which act as sensitizers, lead to an ideal matrix for enhanced and tunable luminescence by lanthani...
Article
This paper reports the synthesis and characterization of four new compounds based on thorium and tetraethyldiglycolamide (TEDGA), [Th(TEDGA)2(C2O4)][NO3]2[H2C2O4].6H2O (1), [Th(TEDGA)2(C2O4)2][H2C2O4]2.2H2O (2), [Th(TEDGA)4][NO3]4.4H2O (3), and [Th2(C2O4)3(TEDGA)4][NO3][HC2O4][H2C2O4]4.7H2O (4). All of them are obtained by successive crystallizatio...
Article
Alkylammoniumhalogenometallate and the alkylenediammoniumhalogenometallates salts groups revealed dielectric, ferroelectric, ferroelastic, phase transition and non-linear optical. Up to now, little attention has held to the compounds of the type [NH3(CH2)nNH3]MCl6. Single crystals of Pentylenediammoniumhexachlorostannate(IV) was obtained by slow ev...