
Paula Sanz CamachoInstitut de Chimie de la Matière Condensée de Bordeaux · Groupe 2: Energie - Matériaux et Batteries
Paula Sanz Camacho
PhD in chemistry
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43
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Introduction
Publications
Publications (43)
Crystalline silicon particles sustaining Mie resonances are readily obtained from the thermal processing of hydrogen silsesquioxane (HSQ). Here, the mechanisms involved in silicon particle formation and growth from HSQ are investigated through real-time in situ analysis using an environmental transmission electron microscope and X-ray diffractomete...
Calcium aluminosilicate hydrate (C-A-S-H) is the binding phase of both blended cement-based and alkali-activated materials. The intrinsic mechanical properties of non-cross-linked C-A-S-H are important while experimentally unvalidated. Here, the properties are for the first time measured using high-pressure X-ray diffraction. The incompressibility...
Several Hard carbon||Na3V2(PO4)2F3 full-cells in 18650-format are assembled to demonstrate the possible use of SIBs in stationary applications. The cell aging process is investigated in two different conditions: (i) continuous cycling at different current rates, and (ii) storage at different states-of-charge at various temperatures. The obtained re...
Despite a wide range of applications, naturally occurring minerals suffer from some limitations for industrial use. Consequently, many research efforts have been conducted to develop a fast, optimized, and sustainable methodology to produce synthetic minerals. In the case of calcium silicate hydrates (CSH), the hydrothermal flow approach allows to...
The Cover Feature shows various particle's morphologies obtained for the Na3V2(PO4)2F3−yOy (0≤y≤2) series of positive electrode materials. The investigations demonstrate the importance of tailoring particle's size, shape and aggregation to reach optimized high rate performance. More information can be found in the Article by J. Olchowka, S. Cassaig...
Among all the positive electrode materials explored for Na‐ion batteries, the family of Na3VIII2‐y(VIVO)y(PO4)2F3‐y (NVPFOy) has attracted extensive attention for its high operating voltage and structural stability. In order to promote better performance at high rates, it appears interesting to consider the correlation between NVPFOy’s composition,...
“In this work, we have employed the innovative supercritical water‐based technology for synthesising high crystalline calcium silicate hydrate nanominerals, finely controlling the Si‐OH and Ca‐OH contents. A key result of this study relies on the observation, for the first time, of a transformation from an ordered “ice‐like” water distribution in t...
Calcium silicate hydrates are members of a large family of minerals with layered structures containing pendant CaOH and SiOH groups that interact with confined water molecules. To rationalize the impact of the local chemical environment on the dynamics of water, SiOH‐ and CaOH‐rich model nanocrystals were synthesized by using the continuous supercr...
The ultra‐fast synthesis of calcium silicate hydrates was performed in supercritical water that acts as a solvent for mimicking the natural conditions at high pressure and high temperature of the geological process. The synthesised xonotlite and tobermorite represent perfect Ca−OH‐rich and Si−OH‐rich model nanocrystals for investigating the effect...
In this work, two different laterites (iron contents of 13.07 and 49.34 wt%, respectively, for lateritic clay, LAC, and iron-rich laterite, LAI) were selected and calcined at 600 °C. The obtained calcined laterites, namely LAI600 and LAC600, were separately mixed with an alkaline solution (silicate modulus of 1.35) or an acidic solution (phosphoric...
In this work, two different laterites (iron contents of 13.07 and 49.34 wt%, respectively, for lateritic clay, LAC, and iron-rich laterite, LAI) were selected and calcined at 600 °C. The obtained calcined laterites, namely LAI600 and LAC600, were separately mixed with an alkaline solution (silicate modulus of 1.35) or an acidic solution (phosphoric...
The local and electronic structures of the Na3V2(PO4)2F3 – Na3V2(PO4)2FO2 electrode materials have been investigated by a combination of 23Na and 31P magic-angle spinning NMR spectroscopy and Density Functional Theory calculations. The spins distribution and the 31P NMR Fermi contact shifts in these materials were calculated based on the projector...
We here present the synthesis of a new material, Na3(VO)Fe(PO4)2F2, by sol-gel method. Its atomic and electronic structural description are determined by a combination of several diffraction and spectroscopy techniques, such as: synchrotron X-ray powder diffraction, synchrotron X-ray absorption spectroscopy at V and Fe K-edges, 57Fe Mössbauer and 3...
Among the positive electrode materials for Na-ion batteries, Na3V2(PO4)2F3 is considered as one of the most promising and generates high interest. Here, we study the influence of the sol-gel synthesis parameters on the structure and on the electrochemical signature of the partially substituted Na3V2-zAlz(PO4)2(F,O)3 materials. We demonstrate that t...
Layered oxide compositions Li3-xNa
x
Ni2SbO6 have been prepared by solid-state synthesis. A complete solid solution is evidenced and characterized by X-ray and neutron diffraction as well as 7Li and 23Na solid-state nuclear magnetic resonance spectroscopy. The transition-metal layer is characterized by the classic honeycomb Ni2+/Sb5+ ordering, wher...
Among polyanionic-based electrode materials developed for Na-ion batteries, one of the most promising families turns out to be Na 3 V 2 (PO 4 ) 2 F 3-y O y (0 ≤ y ≤ 2).[1]
We will first give a summary of all the studies performed for few years in our groups in order to reach an in-depth understanding of the crystallochemistry of this compound, i.e....
Sodium-ion batteries (SIBs) have recently been developed as alternate means of energy storage besides the conventional Lithium-ion batteries (LIBs). Several materials have greatly been studied as promising candidates for positive electrodes in SIBs, such as Na x CoO 2 , Na 3 V 2 (PO 4 ) 3 , Na 3 V 2 (PO 4 ) 2 F 3 and Na 3 V 2 (PO 4 ) 2 FO 2 . ¹⁻⁴ A...
Polyanionic materials are currently intensively studied as promising active materials for positive electrodes in Na-ion batteries thanks to their high stability and the fast ionic mobility within their structural framework. [1] Among those polyanionic materials, Na 3 V 2 (PO 4 ) 2 F 3 and Na 3 V 2 (PO 4 ) 2 FO 2 are the two most attractive ones due...
Polyanionic materials have been intensively studied as promising active materials for positive electrodes in Na-ion batteries thanks to their excellent stability upon cycling and the fast ionic mobility in their structural framework. Among them, Na 3 V 2 (PO 4 ) 2 F 3 and Na 3 (VO) 2 (PO 4 ) 2 F are two of the most promising ones due to their high...
For energy storage, nowadays, Li-ion and Na-ion batteries are major technologies for mobility applications and also for large-scale storage of energy and their integration in the grid. In the scope of finding new positive electrode materials with improved performances, the deep understanding of the link between their structure, electronic structure...
A series of novel P‐E containing heterocycles with aromatic backbones were synthesised and characterized by single crystal and powder X‐ray diffraction, microanalysis and mass spectrometry. 31P and 77Se solution‐ and solid‐state NMR spectroscopy revealed significant differences between the NMR parameters in solution and in the solid state, related...
Organic-inorganic hybrid materials of the type MeQ(diamine)1/2 (where Me–Zn, Cd, Mn and Q–S, Se, Te) belong to the class of 3D nanomaterials. They are built of layers of II–VI semiconductors and amines, which act as linkers. The main goal of our work was the synthesis of compounds of the type ZnxCd1-xSe(1,3-diaminopropane)1/2 and ZnSySe1-y(1,3-diam...
The syntheses of the diaryltelluride 6-Ph2P(O)-Ace-5-TeMes (1O), the tellurenyl(II) chlorides 6-Ph2P(E)-Ace-5-TeCl (2O, E = O; 2S, E = S; 2Se, E = Se), the ditelluroxonium(IV) bis(triflate) [6-Ph2P(O)-Ace-5-TeO]2(O3SCF3)2 (3O), the diaryltellurium(IV) dichloride 6-Ph2P(O)-Ace-5-TeMesCl2 (4O), the diarylhalotelluronium(IV) polyhalides [6-Ph2P(O)-Ace...
Autoprotolysis of the metastable acid (C6F5)3BOPPh2OH, prepared in situ by the reaction of the rather weak Brønsted acid Ph2PO2H with the strong Lewis acid B(C6F5)3, gave rise to the formation of the eight-membered ring [Ph2POB(C6F5)2O]2 and C6F5H. The conjugate base was isolated as stable sodium crown ether salt [Na(15-crown-5)][Ph2PO2B(C6F5)3].
Although the electron-mediated spin-spin or J coupling is conventionally viewed as transmitted via covalent bonds, examples of J couplings between atoms that are not formally bonded but are in close proximity (termed "through-space" J couplings) have been reported. In this work, we investigate the observation of homonuclear (31)P J couplings in org...
A series of new peroxisome proliferator-activated receptors (PPAR) chiral ligands have been designed following the accepted three-module structure comprising polar head, linker and hydrophobic tail. The majority of the ligands incorporate the oxazolidinone moiety as a novel polar head, and the nature of the hydrophobic tail has also been varied. Do...
Previously unknown 3,4-diamino-1,2,5-selenadiazole (6) was prepared by hydrolysis of [1,2,5]selenadiazolo[3,4-c][1,2,5]selenadiazole (7b) and used in synthesis of novel 1,2,5-selenadiazolo[3,4-b]pyrazines by the Koerner–Hinsberg reaction covering the parent compound 4 and its substituted derivatives 5a–g. The compounds synthesized were characterize...
Solid-state NMR spectra of new P-Se heterocycles based on peri-substituted naphthalene motifs show the presence of unusual J couplings between Se and P. These couplings are between atoms in adjacent molecules and occur through space, rather than through conventional covalent bonds. Experimental measurements are supported by relativistic periodic DF...
A short and convenient synthesis of fused 1,2,5-selenadiazoles from the corresponding 1,2,5-thiadiazoles and selenium dioxide has been developed.
A series of peri-substituted phosphorus-tellurium systems R'Te-Acenap-PR2 (R' = Ph, p-An, Nap, Mes, Tip; Acenap = acenaphthene-5,6-diyl (-C12H8); R = (i)Pr, Ph) exhibiting large "through-space" spin-spin coupling constants and the "onset" of three-center four-electron type interactions is presented. The influence of the substituents at the phosphor...
Three related series of peri-substituted bis(tellurides) bearing naphthalene, acenaphthene and acenaphthylene backbones (Nap/Acenap/Aceyl(TeY)2 (Nap=naphthalene-1,8-diyl N; Acenap=acenaphthene-5,6-diyl A; Aceyl=acenaphthylene-5,6-diyl Ay; Y=Ph 1; Fp 2; Tol 3; An-p 4; An-o 5; Tp 6; Mes 7; Tip 8) have been synthesised and their solid-state structur...
Four related sterically restricted peri-substituted acenaphthenes have been prepared containing mixed tin–phosphorus moieties in the proximal 5,6-positions (Acenap[SnR3][PiPr2]; Acenap = acenaphthene-5,6-diyl; R3 = Ph3 (1), Ph2Cl (2), Me2Cl (3), Bu2Cl (4)). The degree of intramolecular P–Sn bonding within the series was investigated by X-ray crysta...
The series of eight 5-(TeY)-6-(SePh)acenaphthenes (Y = Fp (), Tol (), An-p (), An-o (), Tp (), Mes (), Tip (), Nap ()) were prepared and structurally characterised by X-ray crystallography, solution and solid-state NMR spectroscopy and density functional theory (DFT/B3LYP) calculations. All members of the series, except , adopt a BA type configurat...
Hybrid organic-inorganic materials of the type (diamine)MeSO4 (Me = Cd, Zn) [diamine = p-xylylenediamine (PXDA) or m-xylylenediamine (MXDA)] have not been described in the literature to date. Four compounds of this type, namely, (MXDA)ZnSO4 (1), (MXDA)CdSO4 (2), (PXDA)ZnSO4 (3), and (PXDA)CdSO4 (4), were synthesized by solvothermal methods. Since a...