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Phosphorus and Oxygen Dual-Doped Porous Carbon Spheres with Enhanced Reaction Kinetics as Anode Materials for High-Performance Potassium-Ion Hybrid Capacitors

Journal Article


Abstract


  • Hard carbons with low cost and high specific capacity hold great potential as anode materials for potassium-based energy storage. However, their sluggish reaction kinetics and inevitable volume expansion degrade their electrochemical performance. Through rational nanostructure design and a heteroatom doping strategy, herein, the synthesis of phosphorus/oxygen dual-doped porous carbon spheres is reported, which possess expanded interlayer distances, abundant redox active sites, and oxygen-rich defects. The as-developed battery-type anode material shows high discharge capacity (401 mAh g−1 at 0.1 A g−1), outstanding rate capability, and ultralong cycling stability (89.8% after 10 000 cycles). In situ Raman spectroscopy and density functional theory calculations further confirm that the formation of P-C and P-O/P-OH bonds not only improves structural stability, but also contributes to a rapid surface-controlled potassium adsorption process. As a proof of concept, a potassium-ion hybrid capacitor is assembled by a dual-doped porous carbon sphere anode and an activated carbon cathode. It shows superior electrochemical performance, which opens a new avenue to innovative potassium-based energy storage technology.

UOW Authors


  •   Wang, Guoxiu (external author)

Publication Date


  • 2021

Citation


  • Zhao, S., Yan, K., Liang, J., Yuan, Q., Zhang, J., Sun, B., . . . Wang, G. (2021). Phosphorus and Oxygen Dual-Doped Porous Carbon Spheres with Enhanced Reaction Kinetics as Anode Materials for High-Performance Potassium-Ion Hybrid Capacitors. Advanced Functional Materials, 31(31). doi:10.1002/adfm.202102060

Scopus Eid


  • 2-s2.0-85106572748

Volume


  • 31

Issue


  • 31

Abstract


  • Hard carbons with low cost and high specific capacity hold great potential as anode materials for potassium-based energy storage. However, their sluggish reaction kinetics and inevitable volume expansion degrade their electrochemical performance. Through rational nanostructure design and a heteroatom doping strategy, herein, the synthesis of phosphorus/oxygen dual-doped porous carbon spheres is reported, which possess expanded interlayer distances, abundant redox active sites, and oxygen-rich defects. The as-developed battery-type anode material shows high discharge capacity (401 mAh g−1 at 0.1 A g−1), outstanding rate capability, and ultralong cycling stability (89.8% after 10 000 cycles). In situ Raman spectroscopy and density functional theory calculations further confirm that the formation of P-C and P-O/P-OH bonds not only improves structural stability, but also contributes to a rapid surface-controlled potassium adsorption process. As a proof of concept, a potassium-ion hybrid capacitor is assembled by a dual-doped porous carbon sphere anode and an activated carbon cathode. It shows superior electrochemical performance, which opens a new avenue to innovative potassium-based energy storage technology.

UOW Authors


  •   Wang, Guoxiu (external author)

Publication Date


  • 2021

Citation


  • Zhao, S., Yan, K., Liang, J., Yuan, Q., Zhang, J., Sun, B., . . . Wang, G. (2021). Phosphorus and Oxygen Dual-Doped Porous Carbon Spheres with Enhanced Reaction Kinetics as Anode Materials for High-Performance Potassium-Ion Hybrid Capacitors. Advanced Functional Materials, 31(31). doi:10.1002/adfm.202102060

Scopus Eid


  • 2-s2.0-85106572748

Volume


  • 31

Issue


  • 31