A high operating voltage micro-supercapacitor based on the interlamellar modulation type Ti3C2Tx 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 Ti3C2Tx-layer/MnO2-nanorod with an ionic liquid gel electrolyte, achieving a high areal capacitance of 24.7 mF cm-2 within a wide voltage window of 2.5 V. The specific layer-rod interlaced structure of Ti3C2Tx/MnO2 is designed to solve the inaccessibility of large-sized ions in ionic liquids into Ti3C2Tx 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 Ti3C2Tx MXene to accommodate high operating voltage electrolyte with large-sized ions to obtain high-performance MSCs.