Journal
APPLIED MATERIALS TODAY
Volume 16, Issue -, Pages 425-434Publisher
ELSEVIER
DOI: 10.1016/j.apmt.2019.07.003
Keywords
N-doped carbon nanotubes; Graphene; Potassium-ion-capacitor
Categories
Funding
- Australian Research Council (ARC), Australia [FT180100058]
- ARC Research Hub for Graphene Enabled Industry Transformation [IH150100003]
- Queensland University of Technology [FT180100058]
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Potassium (K) ion storage technology is recently receiving a great attention due to their low-cost and enormous abundance on the earth compared to lithium. However, the technology is still at a scientific research stage and exploring suitable electrode materials is a key challenge. Herein, we have engineered nitrogen doped carbon nanotubes (N-CNTs) as a promising anode material for K-ion storage through pyrolytic decomposition of polyaniline nanotubes (PAni-NTs). These N-CNTs delivers high reversible capacity with good rate performance and cycling stability. Taking advantage of these features, a potassium-ion hybrid capacitor (KIHC) is constructed using N-CNTs as battery-type anode and 3-dimensional (3D) laser scribed graphene (LSG) as capacitor-type cathode electrodes. The device displays a high energy density of 65 W h/kg, a high power output of 1000 W/kg, as well as a long cycling life (91% capacity retention over 5000 cycles). Thus, such an advanced energy storage system can satisfy the requirements of high power and high energy densities simultaneously in diverse applications at low-cost. (C) 2019 Elsevier Ltd. All rights reserved.
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