Simple Synthesis of Peanut Shell-Like Mocofe-Ho@Como-Ldh for Efficient Alkaline Oxygen Evolution Reaction

Due to the depletion of fossil energy on earth, it is crucial to develop resource rich and efficient non-precious metal electrocatalysts for oxygen evolution reaction (OER). Herein, we synthesized an efficient and economical electrocatalyst using a simple self-assembly strategy. Firstly, rod-shaped MIL -88A was synthesized by hydrothermal method. Then, the surface of MIL -88A was functionalized and encapsulated in zeolitic imidazolate framework-67 (ZIF-67) by hydrothermal method. The combination of MIL -88A and ZIF-67 resulted in a slight ion-exchange reaction between Co 2+ and the surface of MIL -88A to generate CoFe-LDH@ZIF-67 core -shell structure. Afterwards, in the presence of Mo 6+ , ZIF-67 was converted into CoMo-nanocages through ionexchange reactions, forming a core -shell structure of MoCoFe hydr (oxy) oxide@CoMo-LDH (MoCoFeHO@CoMo-LDH). Due to the advantages of core -shell structure and composition, this material exhibits excellent OER characteristics, with a small Tafel slope (45.11 mV dec -1 ) and low overpotential (324 mV) at 10 mA cm -2 . It exhibits good stability in alkaline media. This research work provides a novel approach for the development of efficient and economical non-precious metal electrocatalysts.