Covalently Aligned Molybdenum Disulfide–Carbon Nanotubes Heteroarchitecture for High-Performance Electrochemical Capacitors

Advanced two-dimensional nanosheets that promote the dynamic transportation and storage capacity of ions are significant for high-performance electrochemical capacitors (ECs). However, such materials often possess a low energy density. We have developed an ordered heteroarchitecture of molybdenum disulfide-carbon nanotubes (MoS₂-CNTs) in which CNTs are vertically grafted within a MoS₂ framework by C−Mo covalent bonds. Benefiting from this in situ vertical bridge, high-speed interlaminar conductivity, unimpeded ion-diffusion channels and sufficient pseudocapacitive reactivity, the MoS₂-CNTs presents ultralarge capacitance (5485 F g⁻¹) and good structural stability in potassium hydroxide electrolyte. Moreover, the all-unified solid-state flexible ECs obtained through direct-write printing construction deliver high energy density (226 mWh g⁻¹), good capacitance (723 F g⁻¹) and stable high/low-temperature operating ability, which can power a wearable health-monitoring device.