Effect of polyaniline on hydrogen absorption–desorption properties and discharge capacity of AB3 alloy

Kinetic properties of La2Mg17–x wt.% Ni (x = 0–200) hydrogen storage alloys prepared by ball milling

“…They found that the discharge capacity of LaMgNi 4 is about 400 mAh/g and had a better cycle stability than Mg 2 Ni. The further investigation of LaMgNi 4 þ LaNi 5 / La 2 MgNi 9 (AB 3 type) was concentrated on surface treatment [5,6] and heat treatment [7,8] to resolve the problem of the low discharge capacity. Kohno et al [9] reported a ternary system of LaeMgeNi that described as LaMgNi 4 þ 2LaNi 5 / La 3 MgNi 14 (A 2 B 7 type), in which the La 3 MgNi 14 alloy (La 0.75 Mg 0.25-Ni 3.0 Co 0.5 ) showed a large discharge capacity of 390 mAh/g.…”

“…Kohno et al [9] reported a ternary system of LaeMgeNi that described as LaMgNi 4 þ 2LaNi 5 / La 3 MgNi 14 (A 2 B 7 type), in which the La 3 MgNi 14 alloy (La 0.75 Mg 0.25-Ni 3.0 Co 0.5 ) showed a large discharge capacity of 390 mAh/g. Delightedly, a new type of LaMgNi 4 þ 3LaNi 5 / La 4 MgNi 19 (A 5 B 19 type) alloys possessed both large discharge capacity and good cycle stability in (La Mg) 5 Ni 19 alloy [10,11]. In summary, difference in proportion and preparation methods of LaeMgeNi alloys produce quite different hydrogen storage properties.…”

Polyaniline as a Material for Hydrogen Storage Applications

“…In addition to the use of PANI chains with metal alloys as a hydrogen absorption composite material, the improved hydrogen absorption kinetics of AB 3 and AB 2 alloys were studied 66–68. PANI shortened the time that was required for the AB 3 –PANI composite to reach absorption kinetics equilibrium by increasing the hydrogen absorption rate.…”

“…PANI shortened the time that was required for the AB 3 –PANI composite to reach absorption kinetics equilibrium by increasing the hydrogen absorption rate. This phenomenon was attributed to the interaction of the hydrogen molecules with PANI and to the participation of the free radicals that were present in PANI in the hydrogen movement within the PANI network, which would lead to an enhancement of the hydrogen absorption rate of the AB 3 alloy 67, 69, 70. Furthermore, the presence of PANI in the AB 3 –PANI composite improves the stability of the AB 3 ‐H bond 67.…”

“…This phenomenon was attributed to the interaction of the hydrogen molecules with PANI and to the participation of the free radicals that were present in PANI in the hydrogen movement within the PANI network, which would lead to an enhancement of the hydrogen absorption rate of the AB 3 alloy 67, 69, 70. Furthermore, the presence of PANI in the AB 3 –PANI composite improves the stability of the AB 3 ‐H bond 67. For the same reason, PANI enhanced the hydrogen absorption rate of the AB 5 ‐type alloy71 and enhanced the hydrogen absorption rate of La–Mg–Ni‐based hydrogen storage alloys 72, 73…”