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

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 Ti₃C₂T_x MXene substrates via a ligand-modulated hydrothermal method. The NiCoMoS–Ti₃C₂T_x heterostructures with strong interfacial coupling are then obtained through interface engineering optimization using a hydrothermal vulcanization process. Thanks to the synergistic advantages of the MXene substrate and the sulfide nanosheets, the NiCoMoS/Ti₃C₂T_x composite exhibits 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/Ti₃C₂T_x//AC assembled using the composite electrode can output an energy density of 45.5 W h kg⁻¹ at a power density of 799.8 W kg⁻¹, and its capacity can remain at 86.3% of the initial value after 5000 cycles, showing good performance and cycling stability.