The use of water splitting has been investigated as a good alternate for storing electrical energy. While the general interest in developing non-toxic, high-performance, and economically feasible catalysts for oxygen evolution reaction (OER) is noteworthy, there is also significant interest in water splitting research. Recently, perovskite-type oxides have performed as an alternative to non-precious metal catalysts and can act as a new class of effective catalysts in water splitting systems. Herein, a perovskite-structured FeTiO₃ was prepared via a facile one-step solvothermal method using ionic liquid as templates. The results of structural and morphological studies have supported the formation of FeTiO₃ perovskite. Furthermore, FeTiO₃ perovskite demonstrated OER activity with a lower onset potential of 1.45 V vs. RHE and Tafel slope value of 0.133 V.dec⁻¹ at 1 M KOH solution using mercury/mercurous oxide (Hg/HgO) were used as working electrodes.

Hydrogen production via two-step thermochemical cycles over fluorite-structure ceria (CeO₂) and ceria-zirconia (Ce_0.75Zr_0.25O₂) materials was studied in packed-bed and micro-channel reactors for comparison purposes. The H₂-temperature program reduction (H₂-TPR) results indicated that the addition of Zr⁴⁺ enhanced the material’s reducibility from 585 µmol/g to 1700 µmol/g, although the reduction temperature increased from 545 to 680 °C. Ce_0.75Zr_0.25O₂ was found to offer higher hydrogen productivity than CeO₂ regardless of the type of reactor. The micro-channel reactor showed better performance than the packed-bed reactor for this reaction.

CO₂ methanation was studied over monometallic catalyst, i.e., Ni, Fe and Co; on CeO₂-Cr₂O₃ support. The catalysts were prepared using one-pot hydrolysis of mixed metal nitrates and ammonium carbonate. Physicochemical properties of the pre- and post-exposure catalysts were characterized by X-Ray Powder Diffraction (XRD), Hydrogen Temperature Programmed Reduction (H₂-TPR), and Field Emission Scanning Electron Microscope (FE-SEM). The screening of three dopants over CeO₂-Cr₂O₃ for CO₂ methanation was conducted in a milli-packed bed reactor. Ni-based catalyst was proven to be the most effective catalyst among all. Thus, a group of NiO/CeO₂-Cr₂O₃ catalysts with Ni loading was investigated further. 40 % NiO/CeO₂-Cr₂O₃ exhibited the highest CO₂ conversion of 97.67% and CH₄ selectivity of 100% at 290 °C. The catalytic stability of NiO/CeO₂-Cr₂O₃ was tested towards the CO₂ methanation reaction over 50 h of time-on-stream experiment, showing a good stability in term of catalytic activity.