Synthesis of FeNiCo Ternary Hydroxides through Green Grinding Method with Metal‐Organic Frameworks as Precursors for Oxygen Evolution Reaction

Abstract Metal‐organic framework (MOF)‐derived materials have been widely applied to diversified fields until now due to their flexible processibility. Different kinds of suitable materials can be synthesized by varying MOF templates/precursors and synthesis methods. An appropriate method can skillfully fabricate the materials with excellent performance while meeting the environmentally friendly concept. In this work, a green and flexible grinding method was introduced to synthesize MOF‐derived FeNiCo trimetallic materials without solvent‐assistance, in which Co‐ZIF‐L was selected as a sacrificial precursor and Fe 3+ and Ni 2+ as etchants and dopants. Surprisingly, the as‐prepared FeNiCo ternary hydroxides supported on Ni foam (G‐FeNi‐Co‐ZIF‐L/NF) showed superior electrocatalytic performance for the oxygen evolution reaction (OER) with a low overpotential of 248 mV at 10 mA cm −2 . This work provides a prospective approach to synthesize various MOF‐derived multi‐metallic materials, which also opens the door for syntheses of OER electrocatalysts.