Journal
ENERGY & ENVIRONMENTAL SCIENCE
Volume 13, Issue 8, Pages 2431-2440Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0ee00477d
Keywords
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Funding
- National Natural Science Foundation of China [21703249, 21875253, 21703250]
- Fujian Natural Science Foundation [2017J05030]
- Fujian Science and Technology Key Project [2016H0043]
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The development of electrode materials with the capability of balancing kinetics and capacity between a battery-type anode and capacitor-type cathode is still a grand challenge for potassium-ion hybrid capacitors (PIHCs). Herein, we report the design and synthesis of phosphorus/nitrogen co-doped hierarchical porous carbon nanofibers (PN-HPCNFs) that feature desirable one dimensional (1D) structure and favorable electrochemical properties for PIHC application. We demonstrated that the as-prepared PN-HPCNFs presented a highly attractive performance in terms of capacity or capacitance and durability as both the battery-type anode and capacitor-type cathode of PIHCs, which endows it with great potential for practical application in full PIHCs by delivering a high energy density of 191 W h kg(-1) and a high power output of 7560 W kg(-1) as well as an ultralong lifespan (82.3% capacity retention after 8000 cycles). Systematic characterization analysis and first-principle calculations demonstrated that the hierarchical pores in the 1D structure, heteroatom P/N co-doping, and enlarged interlayer graphite spacing in the APNHPCNF contributed synergistically to the outstanding electrochemical performance of PIHCs.
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