The development of highly efficient and durable oxygen evolution reaction (OER) catalysts for seawater electrolysis is of great importance for applications. Here, an amorphous FeMoO₄ nanorod array on Ni foam is reported as a highly active OER electrocatalyst in alkaline seawater, requiring only overpotentials of 303 and 332 mV to achieve 100 and 300 mA·cm⁻², respectively. Moreover, it shows strong long-term electrochemical durability for at least 50 h.

Developing efficient and durable oxygen evolution reaction (OER) catalysts holds great promise for green hydrogen production via seawater electrolysis, but remains a challenge. Herein, we report a Co-doped Ni₃S₂ nanosheet array on Ni foam (Co-Ni₃S₂/NF) as a high-efficiency OER electrocatalyst for seawater. In alkaline conditions, Co-Ni₃S₂/NF requires an overpotential of only 368 mV to drive 100 mA·cm^–2, superior to Ni₃S₂/NF (385 mV). Besides, it exhibits at least 50-h continuous electrolysis.