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Hierarchical Porous Carbon Nanofibers for Compatible Anode and Cathode of Potassium-Ion Hybrid Capacitor

Abstract

The development of electrode materials with the capability of balancing kinetics and capacity between battery-type anode and capacitor-type cathode is still a grand challenge for potassium-ion hybrid capacitors (PIHCs). Herein, we report 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 PIHCs application. We demonstrate the as-prepared PN-HPCNFs present highly attractive performance in terms of capacity or capacitance and durability as both 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 Wh 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 demonstrate that the hierarchical pores in 1D structure, heteroatom P/N co-doping, and enlarged interlayer graphite spacing in the APN-HPCNF contribute synergistically to the outstanding electrochemical performance for PIHCs.

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Supplementary files

Article information


Submitted
13 Feb 2020
Accepted
25 Mar 2020
First published
25 Mar 2020

Energy Environ. Sci., 2020, Accepted Manuscript
Article type
Paper

Hierarchical Porous Carbon Nanofibers for Compatible Anode and Cathode of Potassium-Ion Hybrid Capacitor

X. Hu, G. Zhong, J. Li, Y. Liu, J. Yuan, J. Chen, H. Zhan and Z. Wen, Energy Environ. Sci., 2020, Accepted Manuscript , DOI: 10.1039/D0EE00477D

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