MOFs-derived CoMn-layered double hydroxide array anchored to Ti3C2Tx MXene nanosheets as efficent catalysts for rechargeable lithium-oxygen batteries

Rechargeable lithium-oxygen batteries (LOBs) are acknowledged as potential candidates for advanced energy storage devices as a result of their considerable theoretical energy densities . Nevertheless, they encounter significant challenges throughout discharging and recharging phases, including the difficult decomposition of Li 2 O 2 products, sluggish reaction kinetics, and limited cycle stability. In this study, an efficient catalyst was synthesized by in situ growth of metal–organic frameworks (MOFs)-derived cobalt manganese layered double hydroxide (CoMn-LDH) array on Ti 3 C 2 T x MXene nanosheets (CoMn-LDH@Ti 3 C 2 T x ). The LOBs with CoMn-LDH@Ti 3 C 2 T x cathode demonstrated high discharge specific capacity of 27.61 Ah g −1 at 100 mA g −1 and an extended cycle stability of over 224 cycles at 500 mA g −1 . Density functional theory (DFT) computations showed that CoMn-LDH@Ti 3 C 2 T x facilitates electron redistribution, optimising the adsorption energy of intermediates, thereby lowering the energy barriers for oxygen reduction reactions (ORR) and oxygen evolution reactions (OER). Consequently, this work presents a multi-level nanostructured catalyst preparation strategy derived from MOFs, offering new insights for the fabrication of efficient electrocatalytic materials.