Ti EELS standards for identification of catalytic species in NaAlH4 hydrogen storage materials

Graham, Dennis D.; Culnane, Lance F.; Sulic, Martin; Jensen, Craig M.; Robertson, I. M.

doi:10.1016/j.jallcom.2007.04.246

Cited by 16 publications

(14 citation statements)

References 27 publications

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“…As a result, the reaction kinetics of hydrogen desorption from Ti doped NaAlH 4 materials was improved. Another ab-initial calculation inferred that the mixture of Ti and Al theoretically formed TiAl 3 [26] , and this was identical to the experimental results of TiAl 3 phase appearing after several dehydrogenation/hydrogenation cycles [27][28][29] . Meanwhile, Cantelli et al [30] found that there were many H vacancies generated in AlH x species during the dehydrogenation of Ti doped NaAlH 4 materials, and Ti dopants exactly made a favorable thermodynamic condition for AlH x product.…”

Section: Materials Sciencesupporting

confidence: 80%

Catalytic effect and reaction mechanism of Ti doped in NaAlH4: A review

Wang

Chen

et al. 2008

Sci. Bull.

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Section: Materials Sciencesupporting

confidence: 80%

Catalytic effect and reaction mechanism of Ti doped in NaAlH4: A review

Wang

Chen

et al. 2008

Sci. Bull.

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“…On the other hand, it can be assumed that the location of reaction events is at the phase boundary between Al particles and NaH, Na 3 AlH 6 or NaAlH 4 phases [4,6]. It was also suggested that some chemical association of Ti and Al probably existed after several absorption and desorption cycles [4,[8][9][10][11]. The microstructure of NaAlH 4 with TiF 3 additive has been investigated by using TEM, SEM and EDS, which showed there was no significant change in the grain size of Al after 15 cycles [10].…”

Section: Introductionmentioning

confidence: 99%

Study on decomposition process of NaAlH4 by in-situ TEM

Isobe

Yao

Wang

et al. 2010

International Journal of Hydrogen Energy

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In-situ transmission electron microscopy (TEM) has been performed to observe decomposition process of sodium alanate (NaAlH 4 ) in this work. NaAlH 4 was ground in a glove box under inert gas, and then it was transferred into microscope without exposed to air by Plastic Bag Method. The results of in-situ electron beam diffraction showed that NaAlH 4 decomposed to Na 3 AlH 6 + Al, and NaH + Al during heated up to 150, 200°C, respectively. Moreover, we obtained the result of high resolution (HR) TEM images about the decomposition of NaAlH 4 by high voltage electron microscopy (HVEM) of 1250 keV. It showed that the porous structures appeared with increase of temperature. This should be from structural defects and/or cavities due to volume change of the phases. It was also shown that Na 3 AlH 6 and Al particles with the grain size of several ten nm were irregularly distributed near the pores.

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“…It was also reported that the wet/dry doping procedure, when using TiCl 3 in solvents such as tetrahydrofuran (THF), produces THF-stabilized Ti nanoclusters, while the dry doping procedure produces Ti metal, as well as a TieAl alloy [21,22]; however, the TieAl alloy was recently reported to be a much less effective form of Ti catalyst [23,24]. A wet/dry sonochemical doping technique with TiCl 3 was also developed [25] that resulted in a dehydrogenation and hydrogenation performance similar to that reported for Ti nanoclusters [13], graphite, Al and TiCl 3 [20], CeCl 3 [18], and ScCl 3 [19].…”

Section: Introductionmentioning

confidence: 99%