In 2015, Baidya, T., et al reported a novel Ni-based mixed oxide nanomaterials (Ni-Fe-CaO) to catalyze tar removal from producer gas. So, it is shown that 1.6% (Ni40Fe20Ca40) composition exhibits a stable conversion of about 80% at the end of 50 h, while 1% (Ni65Fe35)/Carbo HSP catalyst shows much lower yields as compared to the results of 1.6% (Ni40Fe20Ca40). The singular role of CaO and Fe in promoting Ni for improving catalysts (Ni-Fe-CaO) features was fully analyzed. So, it is proved that both Fe and CaO promoted nickel in the considered catalyst mixed oxides (Ni-Fe-CaO). It found that FeNi3 alloy phase was generated in the catalyst (Ni-), as a result, Ni-Fe-CaO achieved higher TOF value for toluene conversion as compared to single Ni-Ca or Ni-Fe. The catalyst (Ni-Fe-CaO) presented the highest selectivity with Ni/Fe ratios between 2 and 3, which consequently leads to least release by coke. Moreover, Rao, Q et al described a Ni-Fe alloy supported over La0.8Sr0.2FeO3 for the light-enhanced reverse water gas shift (RWGS) process to convert CO2 to CO at low temperature with amazing rates. So, it is shown that the apparent activation energy of RWGS reaction decreases by closely 50% under the cordial light irradiation, and the CO generation rate is enhanced by two times. However, the generation of (Fe, Ni) phase is contributing to the high reactivity of the catalyst during enough operation time. Furthermore, Smirnov, A., et al reported the abiotic NH4 + generation in the existence of Ni-Fe metals and alloys << Awaruite (Ni80Fe20), and tetrataenite (Ni50Fe50) >> and its involvements for the hadean nitrogen cycle. In fact, it is noted after investigation that alloys were less reactive than the metals toward all examined nitrogen species. Also, they noted that nitrite and nitrate were fast converted to ammonium as compared to dinitrogen, and the reduction activity had a strong temperature dependency. Ni-Fe NPs composition influence was investigated for Abiotic carbon dioxide conversion to early prebiotic organics by Beyazay, T., et al's research paper . Indeed, both Mono and bimetallic Ni-Fe NPs with various Ni/Fe ratios revealed to transform carbon dioxide and hydrogen into intermediates and outcome of the acetyl-coenzyme A pathway-formate, acetate, and as well as pyruvate-in mM range under moderate hydrothermal conditions. Also, the Ni-Fe catalysts reached to transform CO2 the same products with the use of water instead of molecular hydrogen. It is mentioned that the two metals play complemental roles for carbon dioxide capture. In particular, due to the remarkable benefit of perovskite-type oxide, Steiger, P., et al investigated the segregation of Ni/Fe bimetallic particles from Lanthanum doped Strontium Titanates to boosts the Sulfur stability of Solid Oxide Fuel Cell Anodes. Indeed, the proposed catalyst tested in a water gas shift reaction, the effect of the additional metal on the catalytic activity and sulfur stability of the Ni catalyst was fully analyzed. As a result, the addition of iron and nickel perovskite catalyst was found to boost the sulfur tolerance. Considerable physicochemical analysis were taken characterize this Ni/Fe segregated perovskite material. An ultra-small FeNi nanoparticles (NPs) was anchored on hierarchically mesoporous carbon by Gao, Y., et al's team for the oxygen evolution reaction . So, the synthesized (fd-FeNi/C) catalyst with 4 nm of particles sizes demonstrated excellent OER performance in alkaline media. As a results, it exhibited in 1.0 M KOH solution 301 mV an overpotential at a current density of 10 mA/cm 2 . Also a small Tafel slope was noted at least 64.5 mV/dec along with higher stability. As concluded, it is taught that this study provides an easy, scalable, and template-free route to transform biomass into powerful active electrocatalysts, which might possess great benefit for future technologies. Moreover, it is shown from Suksumrit's group that Ni-based catalysts are potential candidate for the catalytic methanation of carbon dioxide. So, they presented the possibility to use siderite ore as a catalyst or matrix material for Nibased catalysts. Also, MgO matrix material was as taken support of Ni-based catalysts, to compare their performance as