Properties of La0.2Y0.8Ni5−xMnx alloys for high-pressure hydrogen compressor

Effects of Substitution of Al and Bi for Ni on Structure and Hydrogen Storage Properties of LaNi4.7-xAl0.3Bix (x=0.1, 0.2, 0.3) Alloy

“…Luo et al also reported that when the unit cell expands, especially in both the aand c-directions, in interstitial hole size increases and equilibrium pressure decreases. 18) Unlike that in the case of the Al-containing alloy, Bi substitution adversely affected the storage properties of the Bi-containing alloys. Absorption/ desorption pressure increased steadily, and maximum hydrogen capacity decreased with increasing Bi content.…”

“…Three regions, i.e., solid solution , dual-phase þ , and hydride , can be distinguished easily, as observed in previous studies for similar systems. 18,19) Some of the storage properties of the alloys obtained from the P-C isotherms are summarized in Table III. The maximum storage capacity of the starting alloy (LaNi 5 ) was found to be 1.45 wt %, which is in agreement with the literature value.…”

Influence of Fe on the Hydrogen Storage Properties of LaCeNi Alloys

“…Moreover, these types of materials can be easily activated and can have a good oxygenation resistance . Nevertheless, their HS properties, such as cyclic stability or plateau flatness in the pressure-concentration temperature (PCT) plot, could be improved by alloying of substitution elements. , It is important to note, however, that LaNi 5 -based alloys alloyed by elements with small atomic radii tend to have two plateaus in PCT plots and frequently decreased HS properties. This effect is effectively suppressed through partial replacement of La by rare earth elements such as Ce or Y. − The influence of substituted elements on the thermodynamic stability of the hydride LaNi 4.75 M 0.25 H 7 was theoretically studied in ref .…”

“…26 Nevertheless, their HS properties, such as cyclic stability or plateau flatness in the pressureconcentration temperature (PCT) plot, could be improved by alloying of substitution elements. 27,28 It is important to note, however, that LaNi 5 -based alloys alloyed by elements with small atomic radii tend to have two plateaus in PCT plots and frequently decreased HS properties. This effect is effectively suppressed through partial replacement of La by rare earth elements such as Ce or Y.…”

Critical Temperature and Pressure Conditions of Degradation during Thermochemical Hydrogen Compression: A Case Study of V-Based Hydrogen Storage Alloy

“…Many efforts have been made by researchers around the world to find suitable hydrogen compression material from different categories of hydride, such as AB 5 -type [7][8][9][10][11][12][13], AB 2 -type [13][14][15], BCC-type [16,17], and AB-type intermetallics [18][19][20]. However, most of the work has focused only on hydrogenation properties at normal conditions, or cyclic compressor properties.…”