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AbstractAbstract
[en] Fossil resources account for more than 80 % of the global energy consumption, which is constantly increasing. These energies are polluting, perturb the climate, and furthermore their resources are limited. It is therefore urgent to develop renewable energies. However, most of these energies are intermittent, thus they should be stored and converted to an energy carrier and then transported to the consumers. The use of hydrogen as a mean to store and to distribute energy has many advantages. Within the different methods, storage in the form of metal hydride has the highest density of energy while remaining safe. ABx intermetallic alloys (x = 3, 3.5 or 3.8) composed of [AB5] and [A2B4] units have a strong ability to store hydrogen reversibly. In addition, these alloys can be used as negative electrode in Ni-MH secondary batteries. In this thesis, ABx alloys (A = La, Sm, Y, Mg, B = Ni, Mn) have been synthesized and their structural and hydrogen sorption properties have been studied for solid-gas storage applications. In addition, corrosion in alkaline medium has been investigated for electrochemical applications. (author)
[fr]
Les ressources fossiles representent plus de 80 % de la consommation mondiale en energie et celle-ci continue inexorablement de croitre. Or, ces ressources fossiles sont polluantes, dereglent le climat et leurs reserves sont limitees. Il est donc urgent de developper d'autres sources d'energie telles que les energies renouvelables. Cependant, la majorite de ces energies sont intermittentes, il est donc necessaire de pouvoir les stocker afin de les restituer selon la demande. L'hydrogene utilise comme vecteur de l'energie presente de nombreux avantages. Parmi les differentes methodes existantes, le stockage sous forme d'hydrures metalliques presente la plus forte densite volumique en energie tout en restant sur. Les alliages intermetalliques ABx (x = 3, 3,5 ou 3,8) composes d'unites [AB5] et [A2B4] possedent une forte capacite a stocker l'hydrogene de facon reversible. De plus, ce type d'alliage peut etre utilise comme electrode negative dans les accumulateurs alcalins Ni-MH. Dans cette these, des alliages ABx (A = La, Sm, Y, Mg; B = Ni, Mn) ont ete elabores, leurs proprietes structurales et leurs proprietes d'hydrogenation ont ete etudiees dans le cadre d'applications de stockage de l'hydrogene. L'etude de leur corrosion en milieu alcalin a egalement ete menee, notamment pour une application electrochimique. (auteur)Original Title
Proprietes de sorption de l'hydrogene et mecanismes de corrosion en milieu aqueux d'alliages ABx (A = La, Sm, Y, Mg; B = Ni, Mn; 3 ≤ x < 5) pour le stockage de l'energie
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Source
20 Dec 2018; 208 p; 156 refs.; Available from the INIS Liaison Officer for France, see the INIS website for current contact and E-mail addresses; These Docteur de l'Universite Paris-Est, Specialite: Sciences des Materiaux
Record Type
Miscellaneous
Literature Type
Thesis/Dissertation
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Country of publication
ADSORPTION ISOTHERMS, AGING, CHEMICAL REACTION KINETICS, CORROSION PRODUCTS, ELECTRODES, HYDROGEN STORAGE, HYDROGENATION, INTERMETALLIC COMPOUNDS, LANTHANUM ALLOYS, MAGNESIUM ALLOYS, MANGANESE ALLOYS, NICKEL ALLOYS, POWDER METALLURGY, SAMARIUM ALLOYS, SYNTHESIS, THERMAL GRAVIMETRIC ANALYSIS, YTTRIUM ALLOYS
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