Дисертації з теми "Hydrogen storage compounds"
Оформте джерело за APA, MLA, Chicago, Harvard та іншими стилями
Ознайомтеся з топ-28 дисертацій для дослідження на тему "Hydrogen storage compounds".
Біля кожної праці в переліку літератури доступна кнопка «Додати до бібліографії». Скористайтеся нею – і ми автоматично оформимо бібліографічне посилання на обрану працю в потрібному вам стилі цитування: APA, MLA, «Гарвард», «Чикаго», «Ванкувер» тощо.
Також ви можете завантажити повний текст наукової публікації у форматі «.pdf» та прочитати онлайн анотацію до роботи, якщо відповідні параметри наявні в метаданих.
Переглядайте дисертації для різних дисциплін та оформлюйте правильно вашу бібліографію.
Murshidi, Julie Andrianny. "Hydrogen storage studies of nanoparticulate AI and TiMn based compounds." Thesis, Curtin University, 2012. http://hdl.handle.net/20.500.11937/175.
Повний текст джерелаSun, Weiwei. "Heavy Metal Compounds and Hydrogen Storage Materials from Ab Initio Calculations." Licentiate thesis, KTH, Tillämpad materialfysik, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-120062.
Повний текст джерелаQC 20130327
Sahlberg, Martin. "Light-Metal Hydrides for Hydrogen Storage." Doctoral thesis, Uppsala : Acta Universitatis Upsaliensis, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-107380.
Повний текст джерелаSobkowiak, Adam. "Hydrogen absorption properties of scandium and aluminium based compounds." Thesis, Uppsala University, Department of Materials Chemistry, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-130182.
Повний текст джерелаIn a time of global environmental problems due to overuse of fossil fuels, and a subsequent depletion of the supplies, hydrogen is considered as one of the most important renewable future fuels for use in clean energy systems with zero greenhouse-gas emission. Hydrogen storage is the main issue that needs to be solved before the technology can be implemented into key areas such as transport. The high energy density, good stability and reversibility of metal hydrides make them appealing as hydrogen storage materials. In this thesis research on synthesis and hydrogen absorption properties for intermetallic compounds based on scandium and aluminium is reported. The compounds were synthesized by arc melting or induction melting and exposed to hydrogen in a high pressure furnace. Desorption investigations were performed by thermal desorption spectroscopy. The samples were analyzed by x-ray powder diffraction and electron microscopy. ScAlNi, crystallizing in the MgZn2-type structure (space group: P63/mmc; a = 5.1434(1) Å, c = 8.1820(2) Å), was found to absorb hydrogen by two different mechanisms at different temperature regions. At ~120 °C hydrogen was absorbed by solid solution formation with estimated compositions up to ScAlNiH0.5. At ~500 °C hydrogen was absorbed by disproportionation of ScAlNi into ScH2 and AlNi. The reaction was found to be fully reversible due to destabilization effects which lowered the decomposition temperature of ScH2 by ~460 °C.
Wood, C. R. "Theoretical study of hydrogen storage in alkali- and alkaline-earth graphite intercalate compounds." Thesis, University College London (University of London), 2013. http://discovery.ucl.ac.uk/1399843/.
Повний текст джерелаHoy, Jason Michael. "Syntheses of Aluminum Amidotrihydroborate Compounds and Ammonia Triborane as Potential Hydrogen Storage Materials." The Ohio State University, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=osu1260474478.
Повний текст джерелаMorawa, Eblagon Katarzyna Anna. "On the recyclability of liquid organic hydrides : hydrogenation of 9-ethylcarbazole and other heterocyclic compounds for application in hydrogen storage." Thesis, University of Oxford, 2011. http://ora.ox.ac.uk/objects/uuid:eca70cd1-68cb-48c2-b505-852b11876774.
Повний текст джерелаÖztek, Muzaffer Tonguç. "The study of three different layered structures as model systems for hydrogen storage materials." Doctoral diss., University of Central Florida, 2011. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/5001.
Повний текст джерелаID: 029809891; System requirements: World Wide Web browser and PDF reader.; Mode of access: World Wide Web.; Thesis (Ph.D.)--University of Central Florida, 2011.; Includes bibliographical references (p. 86-101).
Ph.D.
Doctorate
Chemistry
Sciences
Oksuz, Berke. "Production And Characterization Of Cani Compounds For Metal Hydride Batteries." Master's thesis, METU, 2012. http://etd.lib.metu.edu.tr/upload/12614676/index.pdf.
Повний текст джерелаGeorgiev, Peter Alexandrov. "Microgravimetric and neutron scattering studies of the hydrogen storage mechanisms in LaNiâ‚… : types of compounds and single-walled carbon nanotubes." Thesis, University of Salford, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.402053.
Повний текст джерелаSun, Yongzhou. "Study of Ammonia Borane and its Derivatives: Influence of Nanoconfinements and Pressures." FIU Digital Commons, 2015. http://digitalcommons.fiu.edu/etd/1830.
Повний текст джерелаMuto, S., K. Tatsumi, K. Ikeda, and S. Orimo. "Dehydriding process of alpha-AlH3 observed by transmission electron microscopy and electron energy-loss spectroscopy." American Institite of Physics, 2009. http://hdl.handle.net/2237/12636.
Повний текст джерелаLi, Xianda. "Mechanical alloying Ti-Ni based metallic compounds as negative electrode materials for Ni-MH battery." Thesis, Belfort-Montbéliard, 2015. http://www.theses.fr/2015BELF0256/document.
Повний текст джерелаNi-MH (Nickel-Metal-Hydride) batteries have been a promising and extensively studied topic among clean and sustainable energy researches. Finding the ideal material for the negative electrode with high volumetric and gravimetric densities is the key to apply this technology on broader applications. Metal hydrides based on Ti-Ni have balanced properties between hydrogen capacity and electrochemical performances in cycling.The objective of this thesis is to study the effects of element substitution/doping and mechanical alloying on the structural and hydrogen properties of Ti-Ni alloys. In this study, a series of Ti-Ni based systems with Mg or Zr doping/substitution have been systematically investigated.The metallic compounds (TiNi)1-xMgx, (TiH2)1.5Mg0.5Ni, and Ti2-xZrxNi were synthesized by mechanically alloying from elemental powders.The milling time and effects of Mg, Zr substitution/doping were studied firstly in respect of their microstructures, using characterization techniques including XRD, SEM, TEM (EDX support), followed by the hydrogen properties measurements of the samples by hydrogen solid-gas reaction and electrochemical cycling.A first principle calculation tool based on DFT (Density Functional Theory) was carried out to further investigate the enthalpy of formation in order to compare the thermodynamical stability of the obtained compounds. In the study, we have found the alloying priorities in the ternary alloys Ti-Ni-Mg and Ti-Ni-Zr under milling conditions.A structure transformation of Ti to FCC induced by foreign elements is reported and investigated. Enthalpy of formation per atom of the compounds were obtained by DFT calculations, which helped interpreting the experimental results. PCI (Pressure Composition Isotherms) curves and discharge capacities as the function of cycling numbers revealed the hydrogen properties of the obtained compounds, including TiNi, Ti2Ni (amorphous), Ti-Mg and Ti-Zr
Alasmar, Eliane. "Systèmes ternaires à base de magnésium : synthèse, structure, propriétés physiques, stockage et/ou production d’hydrogène." Thesis, Bordeaux, 2018. http://www.theses.fr/2018BORD0023/document.
Повний текст джерелаThe use of fossil fuels (non-renewable energy) is responsible for the increase of the concentration of greenhouse gases in the atmosphere. Among the considered alternatives, hydrogen is seen as the most attractive energy vector. Production and storage of hydrogen is one of the key challenges in developing the hydrogen economy.The first objective of this thesis deal with the synthesis and characterization of magnesium-based ternary compounds in the RE-TM-Mg ternary system (with RE = Rare Earth and TM = transition metals) which could be good candidates for hydrogen storage. These compounds could also have other applications than the hydrogen storage in the future such as light structured material. The NdNiMg15 compound has been the subject of a completed study. This phase crystallizes with a tetragonal symmetry (a= 10.0602(1) and c= 7.7612(2) Å and a space group P4/nmm). It showed an antiferromagnetic ordering at 9 K and a reversible hydrogen storage capacity of 4 %mass. This phase exhibited a hardening effect respect to magnesium compound.The second objective of this thesis concerns the hydrogen production by hydrolysis of i) RE-TM-Mg ternary compounds, which could be considered as an economic and energetic possibility to valorize the waste of these compounds and ii) RE-TM-Mg ternary mixtures prepared by ball milling. The grinding creates defects thus promoting the corrosion of the metals. In addition, the hydrogen production by hydrolysis of the Mg-NdNiMg15 composites (70, 80 and 90 %mass. Mg) was carried out and compared with that of the NdNiMg15 compound (64 %mass. Mg). The main corrosion mechanism determined from the electrochemical measurements of the composites is the galvanic corrosion
Madern, Nicolas. "Propriétés de sorption de l’hydrogène et mécanismes de corrosion en milieu aqueux d’alliages ABx (A = La, Sm, Y, Mg; B = Ni, Mn; 3 ≤ x < 5) pour le stockage de l’énergie." Thesis, Paris Est, 2018. http://www.theses.fr/2018PESC0105.
Повний текст джерелаThe goal of the project is to evidence new A,MgBx alloys with promising capacities for electrochemical application, in particular by substitution of lanthanum with other rare earth such as samarium, yttrium or gadolinium. The project will specially focus on their corrosion behavior in alkaline medium. Calendar and cycling corrosion of these alloys will be studied, as well as the magnesium influence. Corrosion products will be studied by combining morphological, elemental and structural characterization techniques
Ångström, Jonas. "Hydrogen absorption/desorption properties of the Sc(AlxNi1-x)2 system." Thesis, Uppsala universitet, Oorganisk kemi, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-159372.
Повний текст джерелаWilson, Duane C. "Synthesis, Structure, And Characterization Of Rare Earth(Iii) Transition Metal Cyanides; Lanthanide(Ii) And Metallocene Amidotrihydroborates." Columbus, Ohio : Ohio State University, 2009. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1230880974.
Повний текст джерелаPetit, Férey Marie Amélie. "Élaboration et caractérisation d'alliages hydrurables de type ABx (A=La, Mg ; B=Ni ET x=3 à 4) en vue de leur utilisation comme matière active pour électrode négative d'accumulateur Ni-MH." Thesis, Paris Est, 2008. http://www.theses.fr/2008PEST0007/document.
Повний текст джерелаMobile and stationary applications for Ni-MH batteries require continuously more and more energy density. This increased autonomy can be obtained by developing new hydride-forming compounds of ABx-type (3
FALCAO, RAILSON B. "Síntese por reação do TiFe nanoestruturado para o armazenamento de hidrogênio, a partir da moagem de alta energia de misturas de pós de TiH2 e Fe." reponame:Repositório Institucional do IPEN, 2016. http://repositorio.ipen.br:8080/xmlui/handle/123456789/27135.
Повний текст джерелаMade available in DSpace on 2017-03-10T16:23:34Z (GMT). No. of bitstreams: 0
Neste trabalho investigou-se a obtenção do composto TiFe a partir da moagem de alta energia de misturas de pós de TiH2 e Fe, seguida de aquecimento sob vácuo para a reação de síntese. No lugar do Ti, o TiH2 foi escolhido como precursor em razão de sua fragilidade, benéfica para a diminuição da aderência dos pós ao ferramental de moagem. Foram preparados dois lotes de misturas obedecendo-se a relação Ti:Fe de 50:50 e 56:44. Ambos foram processados em um moinho do tipo planetário por tempos que variaram de 5 até 40 horas, sob atmosfera de argônio de elevada pureza. Em todos os experimentos foram mantidos constantes a velocidade de rotação do prato do moinho, a quantidade de amostra, o diâmetro e o número de bolas. As amostras moídas foram caracterizadas por calorimetria exploratória diferencial (DSC), termogravimetria (TG), microscopia eletrônica de varredura (MEV), difração de raios X (DRX) e fluorescência de raios X por dispersão de energia (EDXRF). Apenas TiH2 e Fe foram observados nas amostras moídas, com um grau crescente de mistura em função do tempo de moagem. O composto TiFe nanoestruturado (12,5 a 21,4nm) foi obtido de forma majoritária em todas as amostras após a reação de síntese promovida pelo tratamento térmico a 600ºC (873K). As amostras reagidas foram caracterizadas por microscopia eletrônica de transmissão (MET) e DRX. Um equipamento do tipo Sievert, operando sob um fluxo constante (modo dinâmico), foi utilizado para levantar as curvas termodinâmicas de absorção e dessorção de hidrogênio. Todas as amostras absorveram hidrogênio à temperatura ambiente (~298K) sem a necessidade de ciclos térmicos de ativação. Os melhores resultados foram obtidos com as amostras moídas por 25 e 40 horas, de composição não estequiométrica 56:44. Tais amostras absorveram e dessorveram hidrogênio à temperatura ambiente, sob os platôs de aproximadamente 6,4 e 2,2bar (~0,6 e 0,2MPa), respectivamente. A capacidade máxima de armazenamento foi de 1,06% em massa de hidrogênio (H:M~0,546), sob pressão de até 11bar (1,1MPa), com reversão de até 1,085% em massa de hidrogênio (H:M~0,559), sob pressão de até 1bar (0,1MPa). Estas amostras também apresentaram maior cinética de absorção e dessorção de hidrogênio com fluxos de 1,23 (25h) e 2,86cm3/g.min. (40h). Tais resultados são atribuídos à variação composicional da fase TiFe e à maior quantidade de TiH2 livre.
Tese (Doutorado em Tecnologia Nuclear )
IPEN/D
Instituto de Pesquisas Energéticas e Nucleares - IPEN-CNEN/SP
Couillaud, Samuel. "Synthèse, structure, propriétés physiques et réactivité vis-à-vis de l’hydrogène de nouveaux composés ternaires à base de magnésium." Thesis, Bordeaux 1, 2011. http://www.theses.fr/2011BOR14288/document.
Повний текст джерелаNowadays, the decrease of fossil fuel resources, and the increase of energy requirements and concentration of greenhouse gases in the atmosphere induces the development of new energies. The use of hydrogen as energetic vector is a solution. Indeed, it is abundant and its combustion is highly energetic (3 times more than petrol). However, its utilisation is limited by problems of production, storage and use. In this work, we have focused on the problem of solid hydrogen storage. It allows for high volumetric capacity (≈ 140 g/L) but is restricted by low weight capacity and by slow sorption kinetics. Because magnesium is potentially a good candidate according to its high weight capacity (7.6 %wt), we have chosen to work on the ternary compounds RE-M-Mg (RE = Rare earth, M = transition metal). The goal was double: to keep the good capacity of the magnesium and to decrease the enthalpy of formation of the hydride. The RE4NiMg system (with RE = Y and Gd) and the derived solid solutions were studied. An irreversible hydrogen uptake of 2.5% wt and a magnetic properties change from antiferromagnetic to spin glass behaviour were observed.A more exploratory work allowed us to discover two new magnesium rich compounds: LaCuMg8 and Gd13Ni9.5Mg77.5. Both lead to a phase mixture induced by their decomposition during the first absorption. This mixture allows a very significant improvement of the hydrogen sorption properties of magnesium
Falcão, Railson Bolsoni. "Síntese por reação do TiFe nanoestruturado para o armazenamento de hidrogênio, a partir da moagem de alta energia de misturas de pós de TiH2 e Fe." Universidade de São Paulo, 2016. http://www.teses.usp.br/teses/disponiveis/85/85134/tde-19012017-134345/.
Повний текст джерелаIn this work high-energy ball milling from TiH2 and Fe powder mixtures, followed by post-heating under vacuum, were performed for the reaction synthesis of TiFe compound. TiH2 was used instead of Ti due to its brittleness, preventing strong particles adhesion to the grinding balls and vial walls. Two mixtures batches were prepared following Ti:Fe ratios of 50:50 and 56:44. Both of them were dry-milled in a planetary mill for times ranging from 5 to 40 hours, under high purity argon atmosphere. The speed of main disk rotation, the amount of sample, number and diameter of the balls were kept constant in all experiments. As-milled samples were characterized by differential scanning calorimetry (DSC), thermogravimetric analysis (TG), scanning electron microscopy (SEM), X-ray diffraction (XRD) and energy dispersive X-ray fluorescence (EDXRF). As-milled materials presented only Fe and TiH2 phases showing increased mixture degree with the milling time. After heat treatment at 600ºC (873K), nanostructured TiFe compound (12.5 to 21.4nm) was mostly formed in all samples. Reacted samples were characterized by transmission electron microscopy (TEM) and XRD. Hydrogen absorption and desorption thermodynamics curves were determined in a Sievert-type apparatus operating at constant flow (dynamic mode). All samples absorbed hydrogen at room temperature (~298K) requiring no thermal activation cycles. Best results were seen on samples milled at 25 and 40 hours, with non-stoichiometric composition 56:44. Those samples absorbed and desorbed hydrogen at plateaus of 6.4 and 2.2bar (~0.6 and 0.2MPa), respectively. Maximum hydrogen storage capacity was 1.06 wt% (H:M~0,546) at 11bar (1.1MPa), with reversion of 1.085 wt% (H:M~0,559) at 1bar (0.1MPa). Higher hydrogen absorption and desorption kinetics were observed in those samples, as well, with flows of 1.23 (25h) and 2.86cm3/g.min. (40h). Such results were assigned to the compositional variation of TiFe phase and to the largest amount of free TiH2.
Ourane, Bassem. "Recherche exploratoire de nouveaux intermétalliques ternaires à base de magnésium : application au stockage d’hydrogène." Thesis, Bordeaux, 2014. http://www.theses.fr/2014BORD0054/document.
Повний текст джерелаHydrogen is one of the means to reduce emissions of greenhouse gas emissions. This is a very abundant fuel and its combustion is highly energetic (3 times more than petrol). An obstacle to its use is its storage. Storage in the solid state has significant advantages in terms of volume capacity (100 to 200 g/L) and safety. Magnesium hydride MgH2 is the candidate who shows the best results in terms of specific capacity (7,6 %wt) . However, it is disadvantaged by slow hydrogenation kinetics and high temperature use (very stable hydride). We are interested in intermetallic magnesium rich RE-TM-Mg (RE = Nd, Gd and TM = Cu, Ni). We highlighted three new compositions: NdNiMg5, GdCuMg4 and GdCuMg12. A post- fusion treatment at 700°C for one week followed by slow cooling at 6°C / h up to 300°C allows to obtain these phases. Only the first composition has been the subject of a comprehensive study. It has an antiferromagnetic ordering at 12 K and reversible storage capacity of 2,8 %wt. An almost pure sample for GdCuMg12 phase could be obtained (a = 9,9721(8) Å, c = 7,775(6) Å and space group: P4 / m). In the case of GdCuMg4, the same experimental conditions allowed us to obtain a nearly pure sample. Its structure has not yet been determined
Campesi, Renato. "Synthèse, caractérisation et étude des propriétés thermodynamiques d'hydrogénation de nanocomposites matériaux poreux / métaux-alliages." Phd thesis, Université Paris-Est, 2008. http://tel.archives-ouvertes.fr/tel-00461689.
Повний текст джерелаLemort, Lucille. "Élaboration et caractérisation d'alliages hydrurables de type ABx (A=Pr, Nd, La, Mg ; B=Ni; x=3, 3.5, 3.8, 5) en vue de leur utilisation comme matière active pour électrode négative d'accumulateurs NiMH." Phd thesis, Université Paris-Est, 2010. http://tel.archives-ouvertes.fr/tel-00599399.
Повний текст джерелаChebab, Safa. "Elaboration et caractérisation de composés hydrurables types AB3 (A : terre rares, B : métal 3d) pour le stockage et la conversion d'hydrogène." Thesis, Paris Est, 2017. http://www.theses.fr/2017PESC1054/document.
Повний текст джерелаThe increasing energy demand is mainly supplied by fossil sources which had environmental drawback essentially greenhouse gas emission. Considered as an energy carrier, hydrogen has the huge advantage to be clean. Its storage in intermetallic compound leads too higher hydration capacities than liquid and compressed storage. In this work, LaCaMgNi9 quaternary type alloy has been synthesized, for the first time, by mechanical alloying in order to avoid the inherent difficulties of the fusion technique. The structural and morphological characterization of the obtained alloys were performed. Their hydrogen related properties were examined (solid-gas and electrochemical reactions) in order to study their performance as negative electrode material in Ni-MH batteries
Kawamura, Taro, Michika Ohtake, Yoshitaka Yamamoto, and Satoru Higuchi. "HYDROGEN ABSORPTION BEHAVIOR OF ORGANIC-COMPOUND CLATHRATE HYDRATES." 2008. http://hdl.handle.net/2429/1400.
Повний текст джерелаDalton, Todd H. "Exploratin of novel combinations of Li-based compounds and additives : a new means of solid-state hydrogen storage." Thesis, 2007. http://hdl.handle.net/10125/20475.
Повний текст джерелаJaroń, Tomasz. "Synteza i charakterystyka fizykochemiczna borowodorku itru(III) w fazie stałej oraz jego pochodnych w kontekście ich zdolności do magazynowania wodoru." Doctoral thesis, 2012. http://depotuw.ceon.pl/handle/item/139.
Повний текст джерелаIn this thesis I have described the results of my investigations of hydrogen-rich, solid state hydrogen stores: yttrium borohydride and its derivatives. The description of the experimental findings has been preceded by a comprehensive introduction to the issue of hydrogen storage for fuel cells, physics and chemistry of hydrogen-rich compounds with the emphasis on metal borohydrides, and chemical properties of yttrium. The applied experimental end theoretical methods have also been described, including the technical details of experiments performed. The main part of the thesis is devoted to yttrium borohydride, Y(BH4)3, and begins with the report on the development of the preparative chemistry of this compound. Despite significant efforts, only one reaction led to the desired product: YCl3 + 3 LiBH4 → Y(BH4)3 + 3 LiCl (1). Reaction (1) has been performed via mechanochemical activation during a high-energy disc milling, which does not require any solvent but is not easily scalable to industrial quantities. Reaction (1) results in the product contaminated with a LiCl by-product. Interestingly, similar processes for YF3, or/and NaBH4 as substrates have not led to Y(BH4)3. Y(BH4)3 has been characterised with powder X-ray diffraction, infrared and Raman spectroscopy, and thermogravimetry coupled with differential scanning calorimetry and evolved gas analysis encompassing infrared and mass spectroscopy. Investigation of the solid state products of the thermal decomposition resulted in discovery of high-temperature polymorphic phase of yttrium borohydride, β-Y(BH4)3. This polymorh is less thermally stable than α-Y(BH4)3, which is demonstrated by a significantly lower activation energy and a lower temperature of the first stage of its thermal decomposition. In addition, Y(BD4)3 has been prepared and the isotope effects of H → D substitution have been analysed. Various modification methods have been applied to decrease the temperature of H2 emission from Y(BH4)3. The composites: Y(BH4)3/nLiBH4, n = 1.5, 3, 6, MBH4/Y(BH4)3, M = Li, Na as well as the new compounds: KY(BH4)4, (CH3)4NY(BH4)4 and (C4H9)4NY(BH4)4 have been prepared and characterised. Y(BH4)3/nLiBH4 composites, proton-hydride hydrogen stores, revealed considerably lower thermal decomposition temperature as compared to both Y(BH4)3 and LiNH2. However, the emission of NH3 disqualifies these composites as hydrogen stores. The other studied derivatives of yttrium borohydride listed above, except those contining tetraalkylammonium cations, release a nearly pure hydrogen gas; their thermal decomposition processes have been characterised, including the characteristics of solid state products. Crystal structures of the new compounds have been solved and refined from powder X-ray diffraction data. The monocrystal diffraction has been used to solve the structure of (CH3)4NY(BH4)4, which is the first homoleptic yttrium borohydride prepared as a pure compound. (CH3)4NY(BH4)4 constitutes a convenient precursor towards preparation of various compounds containing [Y(BH4)4]- anion. While the investigated compound/composites could not serve as commercial hydrogen stores for various reasons, they reveal interesting chemistry and serve to expand our knowledge of transition metal borohydrides.