In situ synthesis of conductive porous Ni1.5Cu1.5(HHTP)2 on carbon paper for enhanced rechargeable Li–O2 batteries

Abstract

Li–O₂ batteries have garnered significant attention owing to an ultrahigh theoretical energy density; however, practical applications remain hindered by sluggish cathode reaction kinetics. Among various strategies to overcome these limitations, conductive metal–organic frameworks (c-MOFs) have emerged as promising candidates for next-generation electrocatalysts due to abundant active metal sites, high electrical conductivity, and ordered in-plane porous structures. In this study, a bimetallic Ni_1.5Cu_1.5(HHTP)₂ framework was grown in situ on carbon paper (CP), yielding a cathode with exceptional performance. Specifically, the Ni_1.5Cu_1.5(HHTP)₂/CP cathode exhibits a high specific discharge capacity of 8367 mA h g⁻¹ at 50 mA g⁻¹ and demonstrates excellent stability by sustaining for over 40 cycles at a current density of 50 mA g⁻¹ with a cut-off specific capacity of 500 mA h g⁻¹. This bimetallic c-MOF strategy offers a novel pathway and deeper insights into the design and development of MOF-based electrocatalysts for Li–O₂ batteries.