Abstract
Nitrogen-doped graphitic nanotubes (NGTs) were prepared using one step solid-state-reaction technique. The NGTs facilitate the storage of potassium ion with fast reversibilities.
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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. Np and Ng) 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.