Abstract
The efficiency of electrochemical water splitting is severely restricted by the slow oxygen evolution reaction (OER) on the anode. Therefore, the design and synthesis of high-performance electrocatalysts for anodic oxygen evolution is crucial for the industrialization of hydrogen production by electrolysis of water. Herein, an efficient core-shell Ni(OH)2@NiFe LDH electrocatalyst was designed with the assistant of ionic liquid for OER. The ionic liquid delayed the crystallization ability of Ni2+ ions and then facilitated the formation of NiFe LDH coated Ni(OH)2 structure. The as-obtained core-shell Ni(OH)2@NiFe LDH exhibited outstanding OER electrocatalytic activity that only required overpotentials of 258 mV to deliver current densities of 100 mA cm-2, and a decent stability of at least 300 h under a large current density of 100 mA cm-2. This study provides a valuable reference for the structure design of NiFe LDH based catalyst.
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