Simple synthesis of graphitic nanotube incorporated cobalt nanoparticles for potassium ion batteries

Abstract Synthesis of novel electrodes is a critical step toward realizing rechargeable potassium-ion batteries (PIBs). In present study, the graphitic nanotubes (Co@GTs) implanted with cobalt nanoparticles were firstly fabricated by solid-state reaction. The results showed that in-situ synthesized Co@GTs composite network offered many active sites and provided channels for fast potassium ions transportation. Practical feasibility of the synthesized material has been confirmed by employing it as a positive electrode in potassium-ion batteries (PIBs). The Co@GTs composite exhibited a reversible capacity of 200 mAhg−1 at the current density of 50 mA g−1. Furthermore, the Co@GTs composite showed excellent cycle life, which may be attributed to the mesoscopic carbon substrate implanted with highly crystalized cobalt nanoparticles. This work highlights the capability of catalytic materials and their possibility to be used as a new class of anode materials for rechargeable metal-ion batteries.