Incomplete phase separation strategy to synthesize P/N co-doped porous carbon with interconnected structure for asymmetric supercapacitors with ultra-high power density

Ni Wang, Chenzhe Wang, Lixiang He, Yang Wang, Wencheng Hu, Sridhar Komarneni

Research output: Contribution to journalArticlepeer-review

32 Scopus citations

Abstract

Herein, we propose a facile incomplete phase separation strategy unlike the tedious synthesis approaches of the past to fabricate P/N co-doped porous and interconnected carbon (PNPC) particles with a specific surface area (S A ) of 1920 m 2 g −1 . The heteroatom doped porous carbons were demonstrated to possess improved conductive property and excellent stability for supercapacitor application. The PNPC bunch delivered a high specific capacitance of 318 F g −1 at 1 A g −1 and a remarkable cycling stability, i.e., 96.2% initial capacitance after 10,000 cycles in 6 M KOH electrolyte solution. In addition, an asymmetric supercapacitor (ASC) employing LaNi 0.5 Co 0.5 O 3 /0.333Co 3 O 4 hollow spheres with a mesoporous shell as a positive electrode and PNPC bunch as a negative electrode showed a maximum specific capacitance of 109.6 F g −1 at 1 A g −1 in a potential window of 0–1.7 V. More importantly, the reformative ASC can be discharged up to 0.5 s at a charge current density of 1 A g −1 to deliver an ultrahigh power density of 89.7 kW kg −1 , much higher than those of the reported ASCs. This exciting result paves a way for practical application in high power devices.

Original languageEnglish (US)
Pages (from-to)717-725
Number of pages9
JournalElectrochimica Acta
Volume298
DOIs
StatePublished - Mar 1 2019

All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)
  • Electrochemistry

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