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

Abstract

Abstract 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 3 C 2 T x -layer/MnO 2 -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 Ti 3 C 2 T x /MnO 2 is designed to solve the inaccessibility of large-sized ions in ionic liquids into Ti 3 C 2 T x 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 3 C 2 T x MXene to accommodate high operating voltage electrolyte with large-sized ions to obtain high-performance MSCs.