An appropriate Ni NPs loadings over multi-walled carbon nanotubes (CNTs) with a highly uniform dispersion has been reported in Zhang, J et al's paper as an active catalyst for hydrogen production via ammoniaborane (AB) hydrolysis. Indeed, it is described that Ni/CNTs catalysts reveal excellent catalytic activities towards the hydrolysis of AB. Especially, Ni/CNTs made with 200 ALD cycles possess the highest hydrogen synthesis rate, with a full TOF value as high as (26.20 mol H2/(mol Ni min)), this value was supposed to be higher than most previously Ni-based catalysts reported in the scientific literature. So, due to the high performance of Ni/CNTs, the overall hydrolysis time and activation energy of AB were found to be 4.50 min and 32.30 kJ/mol. Moreover, Pt doping (0.68 wt %) by using two ALD cycles was revealed to be effective in successfully enriching the catalytic activity and reusability of Ni/CNTs material due to the synergistic effect between Pt and Ni NPs. Therefore, it is suggested that atomic layer deposition (ALD) remains a promising method for engineering and fabrication of efficient, cost-effective non-noble metal nanostructured catalysts for AB hydrolysis. In 2017, Wu,Y's group described that uniform Ni NPs embedded over h-BN nanosheets (Ni@h-BN) catalyst displays high catalytic performance for H2 production from AB aqueous solution, particularly for the engineered (Ni@h-BN) with 25.0 wt% Ni charge. So, this catalyst exhibited a good ferromagnetic property at ambient temperature, providing them with quick magnetic separation to recycle. According to kinetics studies, it is suggested that catalyst (Ni@h-BN) amount and reaction temperature govern the hydrogen generation from AB. Despite Ni@h-BN showing good catalytic performance for AB hydrolysis, it presents high activation energy of 47.3 kJ/mol when compared to Ni/CNTs prepared by the ALD method. It is also thought that Ni@h-BN composites might find considerable application in the field of fuel cells. An average size (12 ± 0.7) nm of Ni (0) NPs anchored on both coated cobalt ferrite (Ni 0 /PDA-CoFe2O4, Ni 0 /SiO2-CoFe2O4) and non-coated (Ni 0 /CoFe2O4) have been carefully ascribed by Manna, J's group as an active, magnetically isolable and green catalyst for dehydrogenation of AB. At 25°C, Ni 0 /CoFe2O4 with a Ni loading of 4.0 %wt exhibits the best catalytic activity with a TOF value of 38.30 min -1 in the AB hydrolysis, which shows a volcano shape in Fig. . (a) of TOF vs Ni loading (%wt). Also, the same catalyst displays the highest mole of H2 within up to the first 15 min as can be seen in Fig. . (b). Moreover, it is noted coating cobalt ferrite surface with polydopamine or silica leads to a substantial enhancement of the catalytic stability of the designed materials for AB hydrolysis. In short, Ni 0 /PDA-CoFe2O4 displays high TOF than (Ni 0 /SiO2-CoFe2O4), also cobalt ferrite coated with PDA possesses the best reusability with the lowest activation energy as high as 50.8 kJ/mol compared to both non-coated and coated with silica (Ni 0 /SiO2-CoFe2O4) in the AB hydrolysis at 25°C. Therefore, PDA can be useful for the functionalization of CoFe2O4 and other oxides to boost their catalytic ability as a high active matrix for M NPs in catalysis applications. Both hollow metallic Ni and bimetallic Ni/Pt nanospheres have been discussed as catalytic actives materials for the hydrogen production from ammonia borane hydrolysis as shown in Jiao, W's group research paper . Using ethylenediamine as a complexing agent of Ni 2+ ions was found to be a crucial issue to control the generation of the hollow structure through the reduction speed of Ni 2+ at a reasonably low level. In order to adjust the size of hollow Ni nanospheres, it was necessary to play with the starting ethylenediamine/ethanol volume fraction. Among all tested Ni/Pt hollow bimetallic nanospheres, the catalyst with a molar fraction of 85:15 showed the best catalytic performance for H2 generation (5920 ml H2/gcat.min) from hydrolysis of AB in only three min. This value was higher than the value (5251 ml H2/gcat.min) of Ni/Pt (81:19) nanoparticles. Undoubtedly, due to the magnetic property and the combined synergistic effect and as well as the hollow structure of Ni nanospheres, bimetallic Ni/Pt nanospheres presented superior catalytic performance as compared with bulk Ni materials and as well as Ni/Pt nanoparticles for AB hydrolysis. Hence, due to both magnetic and catalytic features, Ni/Pt hollow nanospheres might be convenient for diverse applications including Hydrogen fuel cells and many other fields. Also, a similar catalyst based on nanoporous Ni spheres has been reported by Cao's group by using an ethylene glycol-mediated process for the preparation of these active nickel spheres for the degradation of AB to produce H2 gas. Indeed, these Ni spheres exhibited a high surface area, good dispersion in water, as well as demonstrated a high catalytic activity towards hydrogen generation through AB hydrolytic dehydrogenation at room temperature with a TOF value as high as (19.6 mol H2/(molcat min)). So, the appropriate Ni concentration for the best Ni spheres catalyst was shown to be 8.5 mM, it presented the highest AB conversion in shorter times. Although Ni spheres catalyst revealed high catalytic activity, it remains below Ni/Pt hollow nanospheres, Ni/CNTs, and as well as Pt catalysts, which have higher activities with the best TOF values. However, nanoporous Ni spheres are still a potential candidate as it shows good activity and is much more cost-effective than many other catalysts such as noble metal-based catalysts. In 2010, Jiang, H.L et al supported both mono (Au, Ni) and bimetallic (Au-Ni of 3-4 nm) over SiO2 nanospheres of around 15 nm for the hydrolytic hydrolysis of AB to produce hydrogen gas. So, as described in their paper AuNi@SiO2 exhibited the highest catalytic activity and as well as improved durability for H2 production from AB dissolution than both Au@SiO2 and Ni@SiO2 performance. Therefore, this superiority could be considered as a result of the synergy effect between Au and Ni atoms, as the presence of Ni species stabilizes the Au NPs, and the existence of Au NPs aids to develop the catalytic performance of the Ni NPs. Despite this enhanced catalytic activity of AuNi@SiO2 catalyst for AB hydrolysis, it is still inferior to nanoporous Ni spheres, Ni/Pt catalysts, Ni/CNTs, and as well as Pt-based catalysts. Moreover, as shown in Rakap's group a ternary alloy (Co-Ni-P) catalyst supported over Pd-activated titania-support through electroless deposition route has been ascribed as an activity material for AB hydrolysis. So, a deep physicochemical study of the catalyst demonstrated that Co-Ni-P/Pd-TiO2 is isolable, redispersible, and as well as green as active material in the hydrolytic hydrolysis of AB. In fact, at both room temperature and 55°C, a maximum hydrogen release from AB was noted to be 60 and 70 (ml of H2) respectively. This catalyst showed activation energy of 54.9 kJ/mol, which is far superior to those of Ni/CNTs prepared by atomic layer deposition, Ni 0 /PDA-CoFe2O4, and Ni@h-BN catalyst prepared by the solvothermal method. Therefore, due to the cost of components of this catalyst (Co-Ni-P/Pd-TiO2) and the synthesis route, it seems that Co-Ni-P/Pd-TiO2 might be useful for other applications and not for H2 production through AB hydrolysis. Recently,Tunç, N et al [58] made a deep study about the use of Ni-based materials (Ni-M) embedded over hydroxyapatite (HAP) as an active catalyst for hydrogen evolution from methanolysis of AB. For this purpose, three catalysts were investigated especially NiRu@HAP, NiRh@HAP, and NiPd@HAP. Experimental results showed that the engineered materials were found to be isolable, extremely redispersible, and as well as ecological for H2 production from AB hydrolysis under mild conditions. Under room temperature of AB hydrolysis, a TOF value of 58.9, 120.3, and 25.2 min -1 were noted for Ni20Ru80@HAP, Ni38Rh62@HAP, and Ni20Pd80@HAP nanoclusters respectively. At the same experimental conditions, activation energy values were found to be 65.9, 66.8, and 58.1 kJ/mol for the same Ni-M@HAP nanoclusters. Therefore, taking into account the price of noble metal (Ru, Rh, and Pd), the cost of other components, and the design route of these engineered Ni-M@HAP nanoclusters, as well as the obtained results, we can conclude that Ni/CNTs, Ni/Pt catalysts, Pt catalysts, Ni@h-BN, and even Co-Ni-P/Pd-TiO2 catalyst might be good candidate than these Ni-M@HAP nanoclusters for hydrogen release from AB hydrolysis reactions. copyright @ 2022, Elsevier.