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The design and development of highly efficient and affordable oxygen evolution reaction (OER) electrocatalysts are crucial for linking water splitting to clean, renewable energy storage. In this study, nanostructured samarium-doped lanthanum nickelate (La₂NiO₄) perovskite oxides were synthesized via the citric acid-based combustion method and evaluated for their OER performance in alkaline media. Among the prepared samples, La₁.₈Sm₀.₂NiO₄ (LS 0.2 NO) exhibited distinct structural features and intrinsic catalytic properties that led to remarkable OER activity. More importantly, LS 0.2 NO demonstrated exceptional stability and achieved a current density of 10 mA·cm⁻² at a low overpotential of 350 mV in alkaline water electrolysis. The optimized catalyst showed a high electrochemical surface area (86.2 cm²), a Tafel slope of 75 mV/dec, and a turnover frequency (TOF) of 0.05 s⁻¹ at 10 mA·cm⁻². This performance highlights the potential of Sm-doped La₂NiO₄ as a cost-effective alternative to noble metal-based OER electrocatalysts.
Saad et al. (Thu,) studied this question.