Scalable preparation of (La,Sr)CoO3-coated nickel foam electrodes for enhanced oxygen evolution in alkaline water electrolysis

• Scalable, low-temp dip-coating method for La 0.6 Sr 0.4 CoO 3 deposition on nickel foam. • Prepared electrode reduces OER overpotential by 70 mV at 10 mA cm −2 in 1 M KOH. • Electrode maintains stability in 6 M KOH at 75 °C and at 500 mA cm −2 . • Extended active surface area contributes to enhanced OER performance. Developing efficient electrocatalysts for the oxygen evolution reaction in alkaline water electrolysis is crucial for green hydrogen production. This study presents a scalable, low-temperature dip-coating method for depositing La 0.6 Sr 0.4 CoO 3 oxide coatings on nickel foam, ensuring high porosity and catalytic efficiency. The impact of catalyst mass loading on OER performance was analysed, revealing that a single-coated electrode (∼12 mg catalyst) reduced the overpotential by ∼ 60 mV, while an electrode with two coating cycles (∼24 mg catalyst) achieved a further ∼ 70 mV reduction in overpotential at 10 mA cm −2 in 1 M KOH. Electrochemical tests in 6 M KOH and temperatures up to 75 °C confirmed improved reaction kinetics and stability under typical operating conditions. The method’s simplicity, reproducibility, and superior electrocatalytic properties make LSC-coated electrodes promising for practical alkaline water electrolysis applications.