Journal
NANO ENERGY
Volume 91, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.nanoen.2021.106630
Keywords
3D hollow frame; Co2-xNixP-N-C-2; MOFs; DFT; High energy density; Hybrid supercapacitors
Categories
Funding
- National Natural Science Foundation of China [51502092, 52072298]
- Natural Science Foundation of Qinghai Province of China [2020-ZJ-910]
- Fundamental Research Funds for the Central Universities [222201718002, JKD01211601]
- Thousand Talents Program Young Project in China
- Program for Eastern Scholar at Shanghai Institutions of Higher Learning [TP2015028]
- Natural Science Foundation of Shaanxi [2020JC-41]
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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.
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.
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