3D frame-like architecture of N-C-incorporated mixed metal phosphide boosting ultrahigh energy density pouch-type supercapacitors

The multi-compositional adjustment and distinctively architectural control have been challenging to modulate the electrochemical performance of favorable supercapacitor electrodes. Herein, three-dimensional hollow open frame-like architectures nickel cobalt phosphate with nitrogen doped carbon (Co2-xNixP-N-C-2) converted from a metal-organic framework precursor is utilized as the functional electrode for supercapacitor, which delivers remarkable electrochemical performance in terms of exceptional capacitance reaching similar to 1374.7 C g(-1) (specific capacitance of similar to 3054.9 F g(-1)) and ultra-long cycling longevity (a retention of similar to 91.7% after 10,000 cycles at 5 A g(-1)). Furthermore, the assembled hybrid supercapacitor (HSC) device displays ultrahigh energy density of similar to 86 Wh kg(-1) at a maximum power density of similar to 800 W kg(-1). The superior performance can be attributed to: (I) 3D hollow open nanostructures provide sufficient electroactive sites and ion-diffusion short-cuts; (II) The introduction of phosphorus can adjust the band structure and gain a small band gap; (III) Bimetals enhance rich redox reactions; (IV) Nitrogen doped carbon ensures high conductivity and charge storage kinetics.

Automated summary

In this study, a three-dimensional hollow open frame-like architecture nickel cobalt phosphate with nitrogen-doped carbon was used as a functional electrode for supercapacitors, delivering remarkable electrochemical performance in terms of high capacitance and long cycling longevity. The hybrid supercapacitor device assembled also exhibited ultrahigh energy density at a maximum power density. The superior performance can be attributed to the specific characteristics of the material, such as 3D nanostructures, phosphorus introduction, bimetal enhancement, and nitrogen-doped carbon.