Metal-organic framework-derived heterostructured ZnCo₂O₄@FeOOH hollow polyhedrons for oxygen evolution reaction

Exploration of non-noble metal electrocatalysts for efficient and durable oxygen evolution reaction (OER) is highly desirable but still remains a great challenge. Herein, we report the rational design and synthesis of heterostructured ZnCo₂O₄/FeOOH hollow polyhedrons (ZnCo₂O₄/FeOOH HPs) as a high-efficient electrocatalyst for OER in alkaline condition. ZnCo₂O₄ hollow polyhedrons (ZnCo₂O₄ HPs), which derived from the bimetallic Zn, Co-zeolitic imidazolate frameworks (ZnCo-ZIFs), are employed as the substrate for the growth of FeOOH nanowires. Benefiting from the hollow structure as well as the synergistic effect between ZnCo₂O₄ HPs and FeOOH nanowires, the ZnCo₂O₄/FeOOH HPs show enhanced OER activity with a low overpotential of 299 mV at the current density of 10 mA cm⁻² and excellent durability. This work offers a promising strategy to develop high-efficient and robust non-noble metal electrocatalysts for large-scale electrochemical applications.