Vertically oriented MoSe0.4S1.6/N-doped C nanostructures directly grown on carbon nanotubes as high-performance anode for potassium-ion batteries

Potassium-ion batteries are a promising candidate for future large-scale energy storage systems due to their merits of cost-effectiveness, high safety, and high-power operation. However, developing suitable anode materials with outstanding kinetics and excellent structural stability remain a great challenge. Herein, in this work, a novel sandwiched hybrid nanoplates vertically anchor on carbon nanotubes, which can improve more edge planes such as (0   0   2) plane to expose. The hybrid nanoplates are consist of N -doped C sandwiched monolayer MoSe 0.4 S 1.6 . The N -doped C layers can adequately contact with S/Se atoms. The introduction of Se in the lattice effectively endows the electrode with fast reaction kinetics and superior cycle stability, with an admirable reversible capacity of 143.7 mAh/g after 1500 cycles at 2.0 A/g. The Se in the lattice can inhibit the agglomeration of Mo atom clusters, and maintain high reversible conversion reaction. Benefit from Se doping, the electrodes have facile K-ion intercalation and rapid K-ion transport simultaneously. Finally, the K-ion full batteries were assembled with prepotassium-perylenetetracarboxylic dianhydride (prepotassium-PTCDA) as a cathode to demonstrate the practical application.