Recent advances in two-dimensional metal-organic frameworks as an exotic candidate for the evaluation of redox-active sites in energy storage devices

Abstract

Because of their unique features and astonishing applications in energy storage devices, two-dimensional (2D) materials have attracted much attention during the last few decades. The 2D-metal-organic frameworks (MOFs) have obtained great importance owing to the potential to promote electrochemically active sites, which enhance the charge storage capability. It refers to a brand-new class of 2D materials that can offer regular active sites and discrete open channels. Still, only a few reports have described that 2D MOFs possess remarkable features to enhance the performance of energy storage devices. In this review, we have briefly discussed the structure, surface chemistry and synthesis with the extent of energy storage applications of 2D MOFs in supercapacitors, batteries, and supercapattery. Further, several synthesis methodologies are also discussed in detail, which is most appropriate for designing 2D MOFs-based energy storage devices. Furthermore, the most essential and core part of this review explained the use of 2D MOFs as an electrode in devices with deep insight into the charge storage mechanisms, stability, and compatibility with electrolyte solutions. In conclusion, but most considerably, the future perspective delivers an inclusive thought and new direction for future research opportunities to apply this family of materials in energy storage applications. Due to remarkable properties such as rapid charge and discharge, extraordinary power density, and prolonged life cycles, these 2D-MOFs are better for energy applications.