A high operating voltage micro-supercapacitor based on the interlamellar modulation type Ti 3 C 2 T x MXene

The increasing demand for miniaturized, wearable, and flexible electronics has promoted the development of micro power sources such as microsupercapacitors (MSCs). This work reports a high-performance MSC based on Ti C T -layer/MnO -nanorod with an ionic liquid gel electrolyte, achieving a high areal capacitance of 24.7 mF cm within a wide voltage window of 2.5 V. The specific layer-rod interlaced structure of Ti C T /MnO is designed to solve the inaccessibility of large-sized ions in ionic liquids into Ti C T layers. As a result, the structure modification provides an enhanced capacitance because the expanded interspace enables a sufficient number of large-sized ions to intercalate/deintercalate. This work provides insightful guidance for the interlaminar modification of Ti C T MXene to accommodate high operating voltage electrolyte with large-sized ions to obtain high-performance MSCs.