Carbon-wrapped Bimetallic Co/Ni Catalysts (C@CoxNi_(1-x)) Derived from Co/Ni-MOF for Bifunctional Catalysts in Rechargeable Zn-Air Batteries

摘要

Carbon-wrapped Co/Ni metal nanoparticles (C@CoxNi_(1-x)) were synthesized by calcination of bimetallic metal-organic frameworks (Co/Ni-MOFs), prepared by a hydrothermal reaction, under N2 atmosphere and explored as bifunctional catalysts for oxygen reduction reactions (ORR) and oxygen evolution reactions (OER) for rechargeable Zn-air batteries. Linear sweep voltammetry (LSV) measurements indicated that the composite obtained at 600°C (N600) exhibited superior electrochemical performance to other composites obtained at 500, 700, 800, and 900°C, respectively. Also N600 exhibited stable current-voltage profiles in a cycling test conducted in 8 M KOH solution for 200 h, suggesting that N600 can be a potential catalyst for rechargeable Zn-air batteries.