Two-Dimensional Materials for Flexible In-Plane Micro-Supercapacitors
Studies on graphene-based and inorganic/organic Two-Dimensional (2D) nanomaterials showed that the optimum energy storage is achieved with porous and curved nanosheets that allow fast ion transport through 2D channels and across nanosheets. Methods for fabricating 2D nanomaterials as electrodes for micro-supercapacitors (MSCs) are commonly chemical vapor deposition, layer-by-layer, sputtering, photolithography, electrochemical and electrophoretic deposition, spray deposition, and printing. The development of energy storage materials that combine the power density of supercapacitors with the energy density of batteries is significantly crucial to advance portable and distributed power technology. On-chip or in-plane MSCs have emerged as potential candidates to complement micro-batteries in various applications due to their safety, fast charge-discharge, and silicon-compatible features. High-concentration electrochemically exfoliated graphene inks formulated through a solvent exchange technique can efficiently print graphene films that can serve not only as electrodes but also as collectors.