A novel 1D MXene fibers-loaded metal-organic framework derived bimetallic sulfide for high-performance supercapacitors

Abstract

Metal-organic frameworks (MOFs), when directly used as electrode materials, encounter issues due to their poor conductivity and low energy density, which restricts their practical application. In this work, the MXene-fibers has been obtained by treating flake Mxene with KOH solution firstly. Then, a novel composite of nanoscale one-dimensional (1D) Mxene-fibers loaded with MOFs-derived metal sulfides (Ni(Co)3S4@MXene-fibers) has been synthesized. The electrochemical analysis results show that the specific capacitance of Ni(Co)3S4@MXene-fibers reaches 829.4C g−1 at 1 A g−1. Moreover, the asymmetric device (Ni(Co)3S4@MXene-fibers//AC) has an energy density of 63.3 Wh kg−1 at a power densi ty of 850 W kg−1. This thanks for the 1D MXene-fibers. SEM and other characterization demonstrate that the 1D MXene-fibers can not only avoid the accumulation of Ni(Co)3S4, but also construct a stable structure with fast charge transfer ability. Besides, it is more conducive to the redox reaction of active substances loaded on its surface, which improves the electrochemical performance.