Czasopismo | INŻYNIERIA MATERIAŁOWA | Rocznik 2013 - zeszyt 4

Nanocrystalline Ti2-xZrxNi (x = 0, 0.25, 0.5) hydrogen storage materials produced by mechanical alloying

nr katalogowy: 79704

Need of safe storage of a big amount of hydrogen at the lowest possible cost and demand for new nickel/metal-hydride (Ni/MHx) batteries cause a large number of research in the field of novel materials for hydrogen absorption. Ti2Ni alloy is one of these materials. First study on hydrogen storage properties of Ti2Ni alloy was carried out by Buchner et al. [1]. They reported that the metal hydride Ti2NiH2.9 may be formed after gaseous hydrogen absorption of Ti2Ni. Theoretical electrochemical capacity of that hydride was to be 500 mAh/g. After 25 years Luan et al. studied electrochemical hydrogen storage properties of Ti2Ni alloy [2÷6]. This group used arc melting method to obtain alloys. 160 mAh/g was maximal discharge capacity they measured. Material had poor cycling stability attributed to the formation and accumulation of irreversible metal hydride. Elemental substitution of Ni by other elements was used to improve cycle stability of Ti2Ni alloy [2, 3]. Also non-metallic elements (O, C and N) were used to increase the plateau of hydrogen desorption and decrease the metal hydride stability [7, 8]. Zr addition or substitution could also improve hydrogen storage capacity of Ti2Ni alloy. Ti-Zr-Ni intermetallic compounds are produced by a number of methods: arc-melting, induction levitation melting, mechanical alloying [9÷11]. Mechanical alloying (MA) is one of a novel and promising method which provides formation of non-equilibrium alloys also with nanostructure [12÷14]. Process consists of the repeated fracturing, mixing and cold welding of fine blend of elementary particles, resulting in size reduction and chemical reactions [15]. This method has already succeeded in synthesizing a wide range of alloy hydride for energy storage or other energy related application [12÷14, 16, 17]. In this work, structure, particle size, morphology and discharge capacity were investigated. Ti2-xZrxNi (x = 0, 0.25, 0.5) nanocrystalline materials [...]

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