Industrial alkaline water electrolysis requires a catalyst electrode with high alkaline resistance and scalability due to the high alkaline concentration, frequent gas desorption, and high hydrogen production power involved. However, most high-performance oxygen evolution reaction (OER) catalysts are poorly adhered to conductive substrates, such as nickel foam or carbon paper, leading to detachment and performance degradation under harsh industrial conditions. Here, we report a simple and scalable strategy of "immersion-infrared drying-calcination" to fabricate Al-doped spinel oxides in situ grown on mechanically robust Ni mesh. By further simple cation substitution, we effectively modulate the metal-oxygen bond length in the octahedral center and the valence state of active sites, significantly enhancing OER activity. Electrochemical tests (1 M KOH, 25°C) show that NiAl