Ce-Doped NiFe Layered Double Hydroxide/NiFe<sub>2</sub>O<sub>4</sub> Nanosheet Catalysts for Water Oxidation
Shaoxia Wang, Kuanjian Zhang, Xinyue Li, Huihui Li, Shifeng Li, Yonghong Ni
Abstract
It is imperative to develop electrocatalysts with excellent activity and robust stability for the oxygen evolution reaction (OER) through simple, energy-saving methods. In this work, a Ce-doped NiFe layered double hydroxide/NiFe 2 O 4 nanosheet hybrid electrocatalyst (labeled as Ce-NiFe LDH/NiFe 2 O 4 ) was deposited on a nickel foam substrate through a simple one-pot hydrothermal route. Electrochemical investigations showed that the as-synthesized catalyst possessed 187 mV of low overpotential at 10 mA cm –2 with a reverse scan mode in 1 M KOH solution along with superb durability of 316 h at a current density of 500 mA cm –2, exhibiting excellent electrocatalytic performances. Experiments revealed that the introduction of NaCl and Ce 3+ during the preparation could markedly promote the electrocatalytic property of the catalyst. Also, the as-prepared catalyst still presented outstanding OER electrocatalytic performances under harsh conditions, such as seawater and strong alkaline solutions, suggesting that the present catalyst bears great potential in practical applications.