geoscience.net logo
+ Resolve Article
+ Follow Us
Follow on FacebookFollow on Facebook
Follow on TwitterFollow on Twitter

+ Translate
+ Subscribe to Site Feed
GeoScience Most Shared ContentMost Shared Content

Body centered cubic magnesium niobium hydride with facile room temperature absorption and four weight percent reversible capacity


, : Body centered cubic magnesium niobium hydride with facile room temperature absorption and four weight percent reversible capacity. Physical Chemistry Chemical Physics 14(31): 10904-9

We have synthesized a new metastable metal hydride with promising hydrogen storage properties. Body centered cubic (bcc) magnesium niobium hydride (Mg(0.75)Nb(0.25))H(2) possesses 4.5 wt% hydrogen gravimetric density, with 4 wt% being reversible. Volumetric hydrogen absorption measurements yield an enthalpy of hydride formation of -53 kJ mol(-1) H(2), which indicates a significant thermodynamic destabilization relative to the baseline -77 kJ mol(-1) H(2) for rutile MgH(2). The hydrogenation cycling kinetics are remarkable. At room temperature and 1 bar hydrogen it takes 30 minutes to absorb a 1.5 μm thick film at sorption cycle 1, and 1 minute at cycle 5. Reversible desorption is achieved in about 60 minutes at 175 °C. Using ab initio calculations we have examined the thermodynamic stability of metallic alloys with hexagonal close packed (hcp) versus bcc crystal structure. Moreover we have analyzed the formation energies of the alloy hydrides that are bcc, rutile or fluorite.

US$19.90

PMID: 22782120

DOI: 10.1039/c2cp42136d


Other references

Prior, Ba, 1979: Measurement of water activity in foods: A review. Water reduction in foods is one of the oldest methods of food preservation. Many methods and instruments are available for laboratory measurement of water activity in foods. Methods are based on the colligative properties of solutions. Water activ...

Smith, E.C.; Althouse, P.M.; Shigley, J.W., 1957: Separation and detection of trifluoroacetyl amino acids. Science 126(3286): 1287-a-1288

X.G.ang Wei,.; Yang Xiang Ning,.; Shi Gui Jun,.; Liu Jia Run,.; Sun Li,, 2001: A comparative study on ecological environments of Yabeina and Chusenella, permian fusulinaceans. Field investigation of stratigraphical distribution of fusulinaceans in the Maokou Formation of Panxian, Guizhou Province has suggested that the Yabeina and Chusenella did not coexist in the same horizon despite the overlapping in stratigraphical...

Laugesen, M., 1975: Child's bangle for the diagnosis of undernutrition. Nursing Journal of India 66(8): 176-177

Sladek, C.D.; Gallagher, M.J., 1993: Vasopressin gene expression in explant and dispersed hypothalamic cultures. Regulatory Peptides 45(1-2): 47-52

Dubendorfer, A.; Hilfiker Kleiner, D.; Hilfiker, A.; Bopp, D.; Nothiger, R., 1995: Sex determination in the soma and germ line of Musca domestica. Journal of Cellular Biochemistry Supplement 0(19B): 41

Urban, A.; Weiss, M.; Bauer, R., 2003: Ectomycorrhizas involving sebacinoid mycobionts. Nuclear ribosomal DNA sequences characteristic of Sebacinaceae were detected by direct amplification of DNA from field collected ectomycorrhizal samples. A study was undertaken to confirm the formation of ectomycorrhizas by Sebacinaceae and to cha...

Garner, D.M.; Vitousek, K.M.; Pike, K.M., 1997: Cognitive-behavioral therapy for anorexia nervosa. Garner, D M [Editor], Garfinkel, P E [Editor] Handbook of treatment for eating disorders, Second edition : 94-144

Poletto, C.; Boëlle, P-Yves.; Colizza, V., 2016: Risk of MERS importation and onward transmission: a systematic review and analysis of cases reported to WHO. The continuing circulation of MERS in the Middle East makes the international dissemination of the disease a permanent threat. To inform risk assessment, we investigated the spatiotemporal pattern of MERS global dissemination and looked for factor...

Ogihara, T.; Takefuji, K., 1954: Studies on inorganic nitrogen fertilizers.. Rice plants suffering from "Akiochi" do not absorb N slowly and continuously like normal plants. Massed calcium cyanamide made by adding sodium silicate to calcium cyanamide contains 16% N, and its application prevents "Akiochi"...