Engineering of high-performance potassium-ion capacitors using polyaniline-derived N-doped carbon nanotubes anode and laser scribed graphene oxide cathode

• Published in: Applied materials today 2019-09, Vol.16, p.425-434
• Main Authors: Moussa, Mahmoud, Al-Bataineh, Sameer A., Losic, Dusan, Dubal, Deepak P.
• Format: Article
• Language: English
• Subjects: Graphene; N-doped carbon nanotubes; Potassium-ion-capacitor
• ISSN: 2352-9407; 2352-9415
• DOI: 10.1016/j.apmt.2019.07.003

We have demonstrated a high performance potassium ion hybrid capacitor (KIHC) using nitrogen doped carbon nanotubes (N-CNTs) anode and 3D porous laser scribed graphene (LSG) cathode.▪ •Engineering of N-doped carbon nanotubes anode and laser scribed graphene oxide cathode for potassium ion battery.•Development of all nanocarbon potassium ion capacitor.•High energy and high power energy storage system. 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 65Wh/kg, a high power output of 1000W/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.