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High-Coverage Ce(OH)₃-Decorated NiFe Layered Double Hydroxide for Durable Seawater Oxidation at Ampere-Scale Current
Xiang Fang1,2, Chun Ye3, Weihua Zhuang1
1Precision Medicine Translational Research Center, Precision Medicine Center, West China Hospital, Sichuan University, Chengdu, Sichuan, 610041, China.
Abstract:
Seawater electrolysis powered by offshore renewable energy, provides an attractive approach for green hydrogen production. Yet, the abundant chloride ions (Cl⁻) in seawater pose severe challenges to the long-term stability of anode materials, particularly under industrial current densities. Herein, a high-coverage Ce(OH)₃-decorated nickel-iron layered double hydroxide (NiFe LDH) electrocatalyst is reported, in which Ce(OH)₃ undergoes in situ transformation into CeO₂ during alkaline seawater oxidation (ASO), forming a robust protective layer that effectively repels Cl⁻. The as-prepared catalyst delivers an overpotential of only 321 mV at 1 A cm⁻2 and maintains exceptional operational stability for over 1000 h with negligible chlorine evolution. Furthermore, the catalyst exhibits accelerated bubble detachment behavior, facilitating rapid gas release and effectively reducing mass transfer resistance during ASO.
