Letteratura scientifica selezionata sul tema "Catalyseurs électrochimiques"
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Articoli di riviste sul tema "Catalyseurs électrochimiques":
DEVYNCK, J., e F. BEDIOUI. "Catalyse électrochimique à l'aide de catalyseurs immobilisés sur support organique ou minéral". Le Journal de Physique IV 04, n. C1 (gennaio 1994): C1–131—C1–146. http://dx.doi.org/10.1051/jp4:1994109.
Tesi sul tema "Catalyseurs électrochimiques":
Hadjar, Abdelkader. "Catalyseurs électrochimiques pour le stockage et la réduction des oxydes d'azote (NOx)". Thesis, Lyon 1, 2009. http://www.theses.fr/2009LYO10111.
The main objective of this study was to demonstrate the coupling between NOx storage/reduction process on barium, with an electrochemical reduction of NOx (micro fuel cell effect) on the same catalyst. The micro fuel cell effect is ensured by a an electromotive force (potential) which is created between catalytic nanoparticules (Pt and Rh) in contact with an ionic conductor (YSZ) and an electronic conductor (doped SiC). The micro fuel cell effect was observed, during the regeneration phase of the catalysts (rich period), on a Pt/Ba/doped α-SiC-YSZ/Rh monolithic system under lean-burn gasoline conditions at 400°C with an enhancement of about 10 % of the NOx conversion over a complete cycle lean/rich. This electrochemical effect was characterized by the electrochemical oxidation of CO (produced by steam reforming) into CO2 by using O2- ions coming from YSZ. Under Diesel conditions, the micro fuel cell system was found to work at low temperature especially at 300°C. In the second part of the work, a new generation of NOx Storage and reduction catalyst was developed consisting only of noble metals (Pt and/or Rh) deposited on YSZ support (Ba free catalyst). The catalytic measurements revealed that YSZ can be used as a NOx storage material in lean burn conditions (Gasoline and Diesel) especially when it was previously reduced under hydrogen. The storage mechanism would take place on the oxygen vacancies created by the removal of O-2 ions from the YSZ structure
Jabbour, Darine. "Influence de la composition et de la structure des hétéropolyanions sur leurs propriétés électrochimiques et électrocatalytiques". Paris 11, 2005. http://www.theses.fr/2005PA112209.
The aim of this work was to study the effects of the accumulation of nickel and copper centres in heteropolyanions on their electrocatalytic behaviour. As concerns Ni-containing heteropolyanions, several compounds based on the trivacant [B,α-PW9O34]9- with different Ni nuclearities were selected. Their stability and redox behaviour in aqueous media were evaluated by UV/vis spectroscopy and cyclic voltammetry as a function of pH with the aim to find conditions under which these compounds could be suitable candidates for electrocatalytic processes. Detailed electrochemical studies on the behaviour of Cu-substituted species were carried out, and particularly on the behaviours of Cu-centres. Also, particular attention was devoted to the electrochemical studies undertaken on the wheel-shaped [Cu20Cl(OH)24(H2O)12(P8W48O1 84)]25-. We demonstrate that an increase in the number of copper centres within this polyanion has beneficial effects on the electrocatalytic reduction of nitrate and nitrite. We have succeeded in isolating several pure samples of α1-P2W17M complexes, (M = MnII, CoII, NiII, CuII, ZnII) by a simple method where preparation and isolation of the lacunary α1-K9LiP2W17O61. 18H2O from K12[H2P2W12O48]. 24H2O were not explicitly necessary steps
Fournier, Maxime. "Etudes électrochimiques de la catalyse de production de dihydrogène par des complexes glyoximes de cobalt". Paris 7, 2012. http://www.theses.fr/2012PA077256.
At present, platinum catalyst are used for the proton reduction in fuel cells. The challenge is now to replace the expensive and limited platinum metal by non-noble metal complexes. Several groups have already proposed coordination metal complexes for the electrocatalysis of hydrogen production. Among those complexes, the glyoxime cobalt: tris-cobaloxime and bis-cobaloxime complexes are reputed to be efficient molecular catalyst. This study using cyclic voltammetry and preparative electrolysis coupled to gas chromatography (GC) reveals a deactivation process of those catalysts in presence of strong acid. Characterization by D. R. X and S. E. M / E. D. X of the carbon electrode reveals an electrodeposition process of cobalt nanoparticles on the surface. These nanoparticles are remarkably active catalysts for H2 production in organic solvent with acid or in water at pH 7 at low overpotential. Thèse nonnoble metal complexes previously described as pure homogeneous catalysts are in fact precursors of an effective heterogeneous catalyst
Tainon, Yannick. "Etude par méthodes électrochimiques et spectroscopiques "in situ" de catalyseurs au platine partiellement désactives par adsorption de composés soufres". Poitiers, 1988. http://www.theses.fr/1988POIT2265.
Kilaparthi, Sravan Kumar. "Carbon-based electrocatalysts for CO2 reduction, PET hydrolysate, and water splitting towards value-added products". Electronic Thesis or Diss., Université de Lille (2022-....), 2023. http://www.theses.fr/2023ULILN051.
This study tackles the major global challenges such as CO2 emissions, energy crisis and PET plastic waste mismanagement, which not only pollutes the environment but also contributes to CO2 emissions during incineration. The innovative approach presented in this thesis offers a dual solution, addressing both PET waste and CO2 emissions simultaneously.Two remarkable systems have been explored in this thesis. The first utilized Bismuth oxide carbonate (BOC) functionalized reduced graphene oxide (rGO) for cathodic CO2 electroreduction (CO2RR), while CuCoO on rGO was employed for anodic PET hydrolysate oxidation. Impressively, the anodic CuCoO@rGO catalyst displayed exceptional electro-activity, achieving an outstanding Faradaic efficiency (FE) of 85.7% at 1.5V vs. RHE. Simultaneously, the cathodic BOC@rGO catalyst demonstrated an impressive FE of 97.4% at -0.8 V vs. RHE, facilitating the production of formate from CO2RR. When integrated into an electrolyzer setup, this approach resulted in formic acid production at a low cell voltage of 1.9 V and a remarkable formate FE of 151.8% at 10 mA cm-2.Another system employed a 3D activated carbon felt (aCF) electrode as substrate and Bismuth has been deposited electrochemically on the CF (Bi@aCF) which acts as the cathode CO2RR and nickel cobalt phosphate-deposited carbon felt (NiCoPOx@CF) for the anodic PET hydrolysate oxidation process. This setup achieved a high FE of 94% during CO2RR at -0.8 V vs. RHE, producing formate, and a FE of 95% for anodic PET hydrolysate oxidation to formate at a low potential of 1.5 V vs. RHE. Remarkably, the two-electrode electrolyzer attained an extraordinary FE of 157% to produce formate at a cell voltage of 1.8 V. This breakthrough represents a novel pathway for upcycling PET waste, reducing CO2 emissions, and promoting environmental sustainability.Additionally, our experiments also delved into water electrolysis, where a novel strategy involving Ru embedded in a carbon nitride matrix was proposed. This approach, utilizing a covalent organic framework 2D CIN-1 structure with coordinated Ru+2, resulted in Ru oxide nanoparticles with low-valence Ru sites arranged in nanowires between layers of graphitic carbon nitride after pyrolysis. This material exhibited significantly lower overpotentials for both hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) compared to benchmark Pt and RuO2 catalysts, demonstrating remarkable catalytic stability. This discovery holds tremendous promise for advancing the field of water splitting and contributing to the development of sustainable energy solutions
Gueret, Robin. "Systèmes moléculaires pour la production d'hydrogène photo-induite dans l'eau associant des catalyseurs de cobalt à un photosensibilisateur de ruthénium ou un colorant organique". Thesis, Université Grenoble Alpes (ComUE), 2017. http://www.theses.fr/2017GREAV074/document.
The work of this manuscript is focused on the design of molecular systems in homogeneous solution for photocatalytic production of molecular hydrogen in water using cobalt catalysts with pentadentate tetrapyridinic and tetra- and pentaza macrocyclic ligands. In association with [Ru(bpy)3]2+ as photosensitizer and sodium ascorbate as sacrificial electron donor, the macrocycle based catalysts display high performances for H2 production, far exceeding those of the polypyridine based catalysts, both in terms of activity and stability, because of the stability of their reduced state «Co(I)». Finally, [Ru(bpy)3]2+ was successfully substituted with a robust organic dye belonging to the triazatriangulenium family, leading to an even more efficient photocatalytic system. These results demonstrate well that organic dyes are a truly efficient alternative to noble metal based photosensitizers, even in acidic aqueous medium
Vanhoye, Didier. "Génération électrochimique de catalyseurs : application aux réactions de carbonylation". Lille 1, 1987. http://www.theses.fr/1987LIL10128.
Aboulkassim, Aicha. "Electrosynthèse d'homopolymères et de copolymères (phenylène-carbazolylène) : propriétés des poudres et des films". Paris 13, 1991. http://www.theses.fr/1991PA132006.
Brusson, Jean-Michel. "Génération électrochimique de catalyseurs Ziegler-Natta pour la polymérisation de l'éthylène". Lille 1, 1988. http://www.theses.fr/1988LIL10125.
Srour, Mahmoud. "Etude électrochimique de catalyseurs à base de platine utilisables en pile à combustible". Grenoble INPG, 1999. http://www.theses.fr/1999INPG0047.