English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Zendy Plus

Presents the zaia usage as premium feature

ZAIA

Presents the pdf analysis as premium feature

PDF Analysis

Insights

Presents the summarisation as premium feature

Summarisation

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the access of premium content as premium feature

Premium Content

Zendy Tools

Zendy Open

A2B7 compounds (A = rare earth or Mg, B = transition metal) are widelystudied as active materials for negative electrode in Ni-MH batteries. Byplaying on the substitution rate of both A and B elements, it is possible toprepare various compositions. This strategy will help to improve theproperties, for example get a higher reversible hydrogen capacity and awell-adapted hydrogen sorption pressure. Indeed, A can be almost all light rareearths (La to Gd), yttrium and alkaline earth metals (Mg or Ca), whereas B cancontain various late transition metals (Mn to Ni). To understand the effects ofcomposition on the physicochemical properties of La2Ni7-based compound, variouspseudo-binary systems have been investigated: Gd2 xLaxNi7 (x = 0, 0.6, 1, 1.5),Sm2-xLaxNi7 (x = 0, 0.5, 1, 1.5), Y2-xLaxNi7 (x = 0, 0.4, 0.5, 0.6, 0.8, 1,1.5, 1.75) and A0.5La1.1Mg0.4Ni7 (A = Sm, Gd and Y). To determine theircrystallographic properties, X-ray diffraction analysis was performed followedby Rietveld refinement. Thermodynamic properties regarding reversible hydrogensorption were investigated at room temperature. Quaternary compounds presentdrastically improved sorption properties in the frame of practical energystorage applications with reversible capacity equivalent to 400 mAh/g for thecompound La1.1Sm0.5Mg0.4Ni7.

Improvement of reversible H storage capacity by fine tuning of the composition in the pseudo-binary systems A2-xLaxNi7 (A = Gd, Sm, Y, Mg)