Ce-Directed Double-Layered Nanosheet Architecture of NiFe-Based Hydroxide as Highly Efficient Water Oxidation Electrocatalyst

The development of highly available low-cost water oxidation electrocatalysts is meaningful for sustainable energy generation. Herein, the unique architecture of double-layered FeNi-based nanosheet-stacks grown on Ni foam (Fe:Ni(OH)(2)/FeCe:Ni-(OH)(2)/NF) was induced by Ce ions in the reaction solution. The as synthesized double-layered catalyst on the substrate of the Ni foam exhibited excellent electrochemical behavior in the catalysis of water oxidation. At the current density of 10 mA cm(-2), the overpotential was as low as 201 mV in alkaline electrolyte. The Tafel slope was only 42.4 mV dec(-1). The high OER electrocatalysis performance of the double-layered nanosheets was related intensely with the introduction of Ce ions, which not only induced the unique architecture of the double-layered vertical nanosheets but also provided more effective charge and mass transfer for electrochemical water oxidation kinetics. These results indicated the promise of expanding the field of lanthanide-doped NiFe-based nanomaterials for applications in energy conversion and storage.