Development of Penroseite (Ni,Co)Se<sub>2</sub> and Ti‐MXene Inks for Maximizing the Energy Density of Screen‐Printed Flexible Microsupercapacitor
Balakrishnan Balan, Mugilan Narayanasamy, Saradh Prasad Rajendra, Mohamad S. AlSalhi, Subramania Angaiah
Abstract
Abstract The push towards reducing the size of portable/wearable electronics, wireless sensors, and the Internet of Things (IoT's) needs a critical requirement of miniaturized energy storage solutions. Typically, micro‐supercapacitors (MSC's) are the main key factors of electrochemical energy storage systems for those miniaturized device applications. Herein, a scalable screen printable flexible microsupercapcitor with highly flexible architecture is developed using a Prussian blue derived 3D‐penroseite (Ni,Co)Se 2 nanocubes as the positive electrode and Ti 3 C 2 T x MXene as the negative electrode. As a result, the printed flexible device delivers an enhanced active electrochemical site and a high areal capacitance of 63 mF cm −2 with a broad working potential range of 1.0 V. Furthermore, the (Ni,Co)Se 2 || Ti 3 C 2 T x based flexible MSC (FMSC) offers a remarkable energy density of 8.75 µWh cm −2 at a power density of 0.5 mW cm −2 , making it an excellent microscale energy storage system for small, portable, and wireless applications.