Vertically oriented NiCoMo sulfide nanosheet arrays on Ti3C2Tx MXene for high performance supercapacitor

Abstract

In this study, a step-by-step synthesis strategy was adopted to successfully construct three-dimensional hierarchical porous architectures by first epitaxially growing vertically oriented NiCoMo hydroxide nanosheet arrays on Ti3C2Tx MXene substrates via a ligand-modulated hydrothermal method. The NiCoMoS-Ti3C2Tx heterostructures with strong interfacial coupling are then obtained through interface engineering optimization using hydrothermal vulcanization process. Thanks to the synergistic advantages of the MXene substrate and the sulfide nanosheets, the NiCoMoS/Ti3C2Tx composite has excellent electrochemical performance. According to tests, in a 1 M KOH electrolyte, the composite electrode can achieve a specific capacity of 1432 F g-1. The asymmetric supercapacitor NiCoMoS/Ti3C2Tx//AC assembled by the composite electrode can output an energy density of 45.5 Wh kg-1 at a power density of 799.8 W kg-1, and its capacity can remain 86.3% of the initial capacity after 5000 cycles, showing good performance. 86.3%, showing good cycling stability.