Upgrading Electron Transfer with High Conductivity MOF Composites for Supercapacitors.

Supercapacitors (SCs) have emerged as promising energy storage devices, offering flexibility and smart functionalities to meet the growing demands of modern applications. However, challenges such as limited conductivity and stability continue to hinder their performance. Herein, a conductive composite was designed by forming one-dimension rod-like conductive MOFs (Ni-HHTP) on the hierarchical nickel oxalate (Ni-OA). The extended conjugated system between Ni2+ and HHTP establishes a robust electron delocalization network, significantly enhancing the conductivity and stability of the MOFs. Simultaneously, the incorporation of Ni-HHTP with Ni-OA effectively reduces internal electron transfer impedance, improving charge transport within the delocalized electronic networks. The synthesized Ni-OA@Ni-HHTP-6//AC achieves a remarkable energy density of 24.78 Wh kg-1 at a power density of 113.03 W kg-1, with a peak power density of 2924.58 W kg-1 at an energy density of 19.68 Wh kg-1. This work provides valuable insights into the design of oxalate@conductive-MOF composites, paving the way for energy storage devices.