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

Abstract

A novel sandwiched hybrid nanoplates vertically anchor on carbon nanotubes. The nanomaterials have facile K-ion intercalation and rapid K-ion transport simultaneously, and can maintain high reversible conversion reaction. The nanomaterials deliver enhanced conductivity and accelerated diffusion kinetics. The as-prepared electrode improves cycle stability and rate performance with reversible capacity. • A novel hybrid nanostructures were prepared for MoSe 0.4 S 1.6 / N -doped C directly grown on carbon nanotubes as high-performance anode. • The electrode improves excellent cycle stability and rate performance with reversible capacity. • The assembled full batteries of coin-type and soft-packed-type can readily lighted up LED bulbs and power the little motor to spin. • The obtained nanomaterials have facile K-ion intercalation and rapid K-ion transport simultaneously. 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.