New insights into the hydrogen storage performance degradation and Al functioning mechanism of LaNi5-Al alloys

Metal hydride hydrogen storage and compression systems for energy storage technologies

“…The plateau pressure can be decreased by the substitution of Ni with Al, Sn, Mn, Co, while the substitution of La with Ce (or Mm/mischmetal), Y, Ca results in the pressure increase [26,32,42e45]. The substitution with Sn [42], Al [43], or Ce [45] also improves stability of LaNi 5 towards disproportionation during prolonged pressure/temperature cycling while Ca substitution worsens the cycle stability [45].…”

Hydrogen Direct Adsorptive Separation: Development Status and Trends

“…The modification methods of other metal alloys and the corresponding mechanisms are similar to those of Mg alloys. In particular, B-type metals can be partially replaced by other metals to improve the adsorption/desorption rate of AB- and AB 2 -type alloys and solid solutions. ,− However, for AB 5 -type alloys, the Ni content must remain high enough so that substitution does not diminish the kinetic properties. − Surface treatment and microstructure modification can also be used to improve the activation properties and kinetic performance of metal alloys. − For example, the adsorption saturation time of a TiFe alloy decreased from over 20 h to around 1 h after Pd deposition …”

Structural, morphological, and electrochemical properties of AB5 hydrogen storage alloy by mechanical alloying

“…AB 5 alloys are the best candidates for hydrogen absorption applications since they have high reactivity towards hydrogen, absorbing more than one hydrogen atom per metal atom (between 1% and 1.5% by weight of hydrogen) under near‐ambient conditions 1,2 . However, the discharge capacity of the LaNi 5 electrode decreases considerably during charge/discharge cycles (50% capacity loss from 100 cycles onwards) 3–5 . This loss is attributed to the rapid sputtering during cycling due to the enormous voltage within the material.…”