MgO is better for this issue. As a result, at 648 K the catalytic activity was comparable, but the proposed catalyst exhibited limited catalytic selectivity to yield methane. Fortunately, when MgO incorporated to the proposed catalyst both CO2 conversion and selectivity to output methane increases significantly. Finally, the (Ni/Siderite-reduced/MgO) catalyst achieved almost 99% of methane selectivity and the CO2 recyclable were close to the thermodynamic equilibrium. Hence, such synthesis might be interesting to look for. Recently, Insyani, R., et al notified that TiO2-anchored Ni catalysts are very promising materials which could be taken as candidates to achieve biomass valorization leading to the selective hydrodeoxygenation (HDO). So, the catalyst they prepared with low iron content about (1.5 wt%) in the Ni/TiO2 highly promoted the formation of cyclohexanol(ch) from guaiacol with 183 ( molch/molNi.h), 85% of rate and selectivity respectively. So, the formed interfacial sites of the fully dispersed NiFe-FeOx core-shell structures over TiO2 matrix promote the demethoxylation of reactant to selectively make cyclic alcohols. Khairani's group studied the synthesis of magnetic (FeNi) bimetallic alloy nanoparticles by the utilisation of laser ablation method in liquids. Their results confirmed that the structure, size, phase, and oxidation of (FeNi) NPs generated by pulsed laser ablation in liquids may be altered by changing the solvent or just removing the water impurities in the organic solvent. But the author thought that the elaboration of ironnickel (FeNi) NPs with control over the generated phases, surface chemistry, particle size, and as well as oxidation state remains a challenge that block its applications. Raimundo's research group presented an elaboration and characterisation of NiFe-carbon fibers (NiFe/CFs) by solution blow spinning and its usages for the oxygen evolution reaction (OER). So, the physicochemical characterization showed that the synthesized material consist of sphere-like NiFe NPs with a diameters ranging from 4 to 12 nm with uniform dispersion over the matrix carbon fibrillar. It has a typical ferromagnetic properties and its catalytic features toward the OER in alkaline media was : 296 mV vs RHE of an overpotential at 10 mA/cm 2 of current density. In addition, over 15 h of electrolysis at 10 mA/cm 2 , the (NiFe/CFs) catalyst was electrochemically very stable. Also, the above Author , studied the prepared of NiFe alloy nanoparticles by utilizing the proteic sol-gel route, followed by a reduction at 700 and 500 °C in H2 atmosphere. So, both magnetical and morphology, structural properties were fully tuned through the thermal treatment in H2 environment. Indeed, the prepared catalysts showed different electrocatalytic properties when applied in the oxygen evolution reaction. At 10 mA/cm 2 , the NiFe-700 exhibited the lower overpotential (307 mV) while the NiFe-500 has an overpotential of 319 mV. Hence, indicating superior electrochemical features of the FCC NiFe alloy. Their activity were even beyond to the RuO2 & IrO2 the state-of-art catalysts. Upon 15 h of electrochemical stability analysis by chrono potentiometric investigations, both catalysts revealed to be very stable. Hence, tetrataenite is best.