Solid-state synthesis of nitrogen-doped graphitic nanotubes with outstanding electrochemical properties

Synthesis of new anodes is crucial for commercialization of rechargeable potassium-ion batteries (PIBs). In this work, the nitrogen-doped graphitic nanotubes (NGTs) were synthesized by solid-state reaction method. The microstructural characterization of synthesized NGTs revealed the presence of many active sites (provided by N-doping i.e. N-P and N-g) and tubular channels for the K+ ion transport. The NGTs electrode was tested against potassium metal in the presence of carbonate based electrolytes. The NGTs revealed the maximum reversible capacity of 220 mA h g(-1) at 20 mA g(-1) current density. Furthermore, the cycle stability of NGTs was confirmed by cycling it for 200 times at the current density of 100 mA g(-1), where specific capacity of 81.2 mA h g(-1) was retained. The excellent electrochemical properties (rate capability) and fast synthesis of NGTs highlights its possibility to be used against post-lithium metal anodes in near future. (C) 2021 The Authors. Published by Elsevier B.V. on behalf of King Saud University.

Automated summary

The nitrogen-doped graphitic nanotubes (NGTs) synthesized by solid-state reaction method show excellent electrochemical properties and cycle stability, making them suitable for replacing post-lithium metal anodes in potassium-ion batteries (PIBs) in the near future.