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@PHDTHESIS{Meng:15115,
      author       = {Meng, Li},
      title        = {{I}mproved hydrogen sorption kinetics in wet ball milled
                      {M}g hydrides},
      volume       = {93},
      issn         = {1866-1793},
      school       = {Universität Bochum},
      type         = {Dr. (Univ.)},
      address      = {Jülich},
      publisher    = {Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag},
      reportid     = {PreJuSER-15115},
      isbn         = {978-3-89336-687-3},
      series       = {Schriften des Forschungszentrums Jülich : Energie $\&$
                      Umwelt / Energy $\&$ Environment},
      year         = {2011},
      note         = {Record converted from JUWEL: 18.07.2013; Ruhr-Universität
                      Bochum, Fakultät für Maschinenbau, Diss., 2010},
      abstract     = {In this work, wet ball milling method is used in order to
                      improve hydrogen sorption behavior due to its improved
                      microstructure of solid hydrogen materials. Compared to
                      traditional ball milling method, wet ball milling has
                      benefits on improvement of MgH$_{2}$ microstructure and
                      further influences on its hydrogen sorption behavior. With
                      the help of solvent tetrahydrofuran (THF), wet ball milled
                      MgH$_{2}$ powder has much smaller particle size and its
                      specific surface area is 7 times as large as that of dry
                      ball milled MgH2 powder. Although after ball milling the
                      grain size is decreased a lot compared to as-received
                      MgH$_{2}$ powder, the grain size of wet ball milled
                      MgH$_{2}$ powder is larger than that of dry ball milled
                      MgH$_{2}$ powder due to the lubricant effect of solvent THF
                      during wet ball milling. The improved particle size and
                      specific surface area of wet ball milled MgH$_{2}$ powder is
                      found to be determining its hydrogen sorption kinetics
                      especially at relatively low temperatures. And it also shows
                      good cycling sorption behavior, which decides on its
                      industrial applicability. With three different catalysts
                      MgH$_{2}$ powder shows improved hydrogen sorption behavior
                      as well as the cyclic sorption behavior. Among them, the
                      Nb$_{2}$O$_{5}$ catalyst is found to be the most effective
                      one in this work. Compared to the wet ball milled MgH$_{2}$
                      powder, the particle size and specific surface area of the
                      MgH$_{2}$ powder with catalysts are similar to the previous
                      ones, while the grain size of the MgH$_{2}$ with catalysts
                      is much finer. In this case, two reasons for hydrogen
                      sorption improvement are suggested: one is the reduction of
                      the grain size. The other may be as pointed out in some
                      literatures that formation of new oxidation could enhance
                      the hydrogen sorption kinetics, which is also the reason why
                      its hydrogen capacity is decreased compared to without
                      catalysts. After further ball milling, the specific surface
                      area of wet ball milled MgH$_{2}$ with Nb$_{2}$O$_{5}$ is
                      much larger than the standard wet ball milled MgH$_{2}$ with
                      Nb$_{2}$O$_{5}$ and the corresponding sorption behavior is
                      also much improved. Furthermore, a simple model is built up
                      in which the key parameter is main specific surface area and
                      it follows the experimental desorption results quite well.},
      cin          = {IEK-1},
      ddc          = {500},
      cid          = {I:(DE-Juel1)IEK-1-20101013},
      pnm          = {Rationelle Energieumwandlung},
      pid          = {G:(DE-Juel1)FUEK402},
      typ          = {PUB:(DE-HGF)11 / PUB:(DE-HGF)3},
      url          = {https://juser.fz-juelich.de/record/15115},
}