Fabrication of Copper-Doped Lignin-Based Carbon Nanotube Composite Electrodes for Energy Storage Applications

Energy storage devices made of environmentally friendly materials are in high demand due to recycling's growing relevance. Currently, these energy storage methods are not satisfactory. Numerous technological energy storage devices incorporate copper, an important metal. This work fabricated a Cu-doped lignin-based carbon nanotube (Cu@CNT/lig) for use as an electrode material in energy storage applications. The Cu@CNT/lig exhibits a porous network topology that connects to one another. It has a high specific capacitance of 963.75 F g<sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">−1</sup>, an energy density of 48.18 Wh kg<sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">−1</sup>, and a power density of 150 W Kg<sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">−1</sup>at the current density of 0.5 A g<sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">−1</sup>,. This research work endows the electrode material with efficient rate performance, providing a new pathway to engineer the promising electrode material and fabricate high-performance energy storage devices.