Paper Supercapacitor Developed Using a Manganese Dioxide/Carbon Black Composite and a Water Hyacinth Cellulose Nanofiber-Based Bilayer Separator

Abstract

Flexible and green energy storage devices have a wide range of applications in prospective electronics and connected devices. In this study, a new eco-friendly bilayer separator and primary and secondary paper supercapacitors based on manganese dioxide (MnO2)/carbon black (CB) are developed. The bilayer separator is prepared via a two-step fabrication process involving freeze–thawing and nonsolvent-induced phase separation. The prepared bilayer separator exhibits superior porosity of 46%, wettability of 46.5°, and electrolyte uptake of 194% when compared with a Celgard 2320 trilayer separator (39%, 55.58°, and 110%). Moreover, lower bulk resistance yields a higher ionic conductivity of 0.52 mS cm–1 in comparison to 0.22 mS cm–1 for the Celgard separator. Furthermore, the bilayer separator exhibits improved mean efficiency of 0.44% and higher specific discharge capacitance of 13.53%. The anodic and cathodic electrodes are coated on a paper substrate using MnO2/CB and zinc metal-loaded CB composites. The paper supercapacitor demonstrates a high specific capacitance of 34.1 mF cm–2 and energy and power density of 1.70 μWh cm–2 and 204.8 μW cm–2 at 500 μA, respectively. In summary, the concept of an eco-friendly bilayer cellulose separator with paper-based supercapacitors offers an environmentally friendly alternative to traditional energy storage devices.

Enhancing Supercapacitor Electrochemical Performance with 3D Printed Cellular PEEK/MWCNT Electrodes Coated with PEDOT: PSS

“…Various printing technologies, including screen printing, 3D printing, and inkjet printing, are widely employed for the cost-effective production of electrodes in energy storage devices. − However, the challenge lies in achieving efficient material architectures that reduce material waste and use low-cost materials for electrode fabrication . Additive manufacturing, specifically 3D printing, is extensively acknowledged for addressing these challenges in fabricating energy storage electrodes with diverse architecture. − The anticipated benefits of 3D-printed energy storage devices include high energy and power density, lightweight design, rapid charging rates, and extended lifetime. , A variety of materials, such as polypyrrole@Ag, MXene Sediment ink, WO 3 anodes and Prussian blue cathodes, and Ti 3 C 2 T x MXene/Cellulose Nanofiber, have been utilized in the 3D printing of SCs, showcasing remarkable performances due to their high conductivity, specific capacity, and pseudo capacitance behavior.…”