Synergistic nanostructuring of CoNi-carbide/reduced graphene oxide derived from porous coordination polymers for high-performance hybrid supercapacitors

Porous coordination polymers (PCPs) and metal-organic frameworks (MOFs) have emerged as promising ma-terials for nanostructuring inorganic functional materials with applications in energy storage. In this study, our aim was to synthesize CoNi-carbide (CoNi-C)/reduced graphene oxide (rGO) hybrids by annealing CoNi-cyanide bridged coordination polymers (CoNi-CP) under a nitrogen atmosphere. The resulting CoNi-C/rGO hybrids exhibited exceptional electrochemical performance, surpassing the individual components (CoNi-C and rGO). The hybrids demonstrated a specific capacitance of 1177 F g-1 and an electroactive surface area of 130.87 m2 g-1. By optimizing the CoNi-C/rGO ratio, we achieved the highest specific capacitance. Furthermore, we con-structed a coin cell using CoNi-C/rGO-2 as the positive electrode and rGO as the negative electrode, which showed excellent performance with an energy density of 31.6 Wh kg-1 at a power density of 750 W kg-1 and capacitive retention of 84 % over 8000 charging cycles. Our findings provide valuable insights into designing and developing high-performance electrode materials for energy storage, with potential applications in various devices.

Automated summary

CoNi-carbide/reduced graphene oxide hybrids were synthesized by annealing CoNi-cyanide bridged coordination polymers under a nitrogen atmosphere. The hybrids exhibited exceptional electrochemical performance, surpassing the individual components. By optimizing the CoNi-C/rGO ratio, the highest specific capacitance was achieved. Furthermore, a coin cell constructed using CoNi-C/rGO-2 as the positive electrode showed excellent performance and capacitive retention over 8000 charging cycles.