Advanced (Cu,Co)Se2 Nanocubes and Ti‐MXene Based Screen Printed Electrodes for High Performance Flexible Microsupercapacitors

Abstract Nowadays, the demand for portable micro‐energy storage devices with high energy density and scalable printing with cost‐effective fabrication for microsupercapacitors (MSC) are essential. Furthermore, the urgent need for this high‐performance MSC to meet all industrial sector requirements are very challenging. Herein, the screen printable MSC with high energy density is demonstrated by using copper hexacyanocobaltate (CuHCCo) derived (Cu,Co)Se 2 nanocubes as the positive electrode and Ti‐MXene (Ti 3 C 2 T x ) as the negative electrode. The prepared battery type (Cu,Co)Se 2 nanocubes greatly enhance the high electrochemical activity and active surface area. As a result, it delivers a high specific capacity of 602 C g −1 at the current density of 1 A g −1 . The fabricated screen printable asymmetric MSC has enhanced ion‐to‐electron transfer in printable microelectrodes with numerous electrochemical active sites and delivered the high areal capacitance of 58 mA cm −2 at the current density of 1 mA cm −2 with a wide potential window. The device gives a high energy density of 8.06 µWh cm −2 and a high power density of 5 mW cm −2 . These results demonstrate the new strategies of fabricating electrode materials in screen printable asymmetric MSC and show promising in microscale energy storage devices in the miniaturized devices with sustainable self‐powered compatibility.