High Performance MXene/MnCo2O4 Supercapacitor Device for Powering Small Robotics

Abstract

The development of advanced energy storage devices is critical for various applications including robotics and portable electronics. The energy storage field faces significant challenges in designing devices that can operate effectively for extended periods while maintaining exceptional electrochemical performance. Supercapacitors, which bridge the gap between batteries and conventional capacitors, offer a promising solution due to their high power density and rapid charge–discharge capabilities. This study focuses on the fabrication and evaluation of a MXene/MnCo₂O₄ nanocomposite supercapacitor electrode using a simple and cost-effective electrodeposition method on a copper substrate. The MXene/MnCo₂O₄ nanocomposite exhibits superior electrochemical properties, including a specific capacitance of 668 F g^–1, high energy density (35 Wh kg^–1), and excellent cycling stability (94.6% retention over 5000 cycles). The combination of MXene and MnCo₂O₄ enhances the redox activity, electronic conductivity, and structural integrity of the electrode. An asymmetric supercapacitor device, incorporating MXene/MnCo₂O₄ as the positive electrode and Bi₂O₃ as the negative electrode, demonstrates remarkable performance in powering small robotics and small electronics. This work underscores the potential of MXene-based nanocomposites for high-performance supercapacitor applications, paving the way for future advancements in energy storage technologies.