Hydrangea-Like Nanosheets of Co(Oh)2@Nife-Ldh/Nf as Efficient Electrocatalyst for Oxygen Evolution Reaction

The rational design of efficient, and low-cost OER electrocatalyst is critical to overall water splitting. One of the well-known electrocatalysts is hydroxide. In this work, the simple and rapid hydrothermal-electrodeposition method was used to prepare Co(OH) 2 @NiFe-LDH/NF. First, the NiFe-LDH nanospheres were grown directly on the nickel foam (NF) surface using a hydrothermal method, and then NiFe-LDH/NF was converted into amorphous Co(OH) 2 @NiFe-LDH/NF using an electrodeposition method. Particularly, the optimized material exhibits excellent OER performance in alkaline electrolyte. Overpotentials of 209 mV and 229 mV were required to drive current densities of 50 mA cm -2 and 100 mA cm -2 . Besides, the material possesses a small Tafel slope (38.7 mV dec -1 ) and displays outstanding durability after 100 h. This strategy opens up new possibilities for future non-precious metal OER electrocatalysts.