Diffusion controlled electrochemical analysis of MoS 2 and MOF derived metal oxide-carbon hybrids for high performance supercapacitors.

In the context of emerging electric devices, the demand for advanced energy storage materials has intensified. These materials must encompass both surface and diffusion-driven charge storage mechanisms. While diffusion-driven reactions offer high capacitance by utilizing the bulk of the material, their effectiveness diminishes at higher discharge rates. Conversely, surface-controlled reactions provide rapid charge/discharge rates and high power density. To strike a balance between these attributes, we devised a tri-composite material, TiO ₂ /Carbon/MoS ₂ (T10/MoS ₂ ). This innovative design features a highly porous carbon core for efficient diffusion and redox-active MoS ₂ nanosheets on the surface. Leveraging these characteristics, the T10/MoS ₂ composite exhibited impressive specific capacitance (436 F/g at 5 mV/s), with a significant contribution from the diffusion-controlled process (82%). Furthermore, our symmetrical device achieved a notable energy density of ~ 50 Wh/kg at a power density of 1.3 kW/kg. This concept holds promise for extending the approach to other Metal-Organic Framework (MOF) structures, enabling enhanced diffusion-controlled processes in energy storage applications.
(© 2023. The Author(s).)