Layer-by-Layer Assembly of Reduced Graphene Oxide and MXene Nanosheets for Wire-Shaped Flexible Supercapacitors
| Autor: | Yijun Chen, Ian Echols, Dustin E. Holta, Shaoyang Wang, Xiaofei Zhao, Micah J. Green, Miladin Radovic, Mohammad Naraghi, Junyeong Yun, Paraskevi Flouda, Jodie L. Lutkenhaus |
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| Rok vydání: | 2021 |
| Předmět: |
Supercapacitor
Materials science Graphene Layer by layer Oxide Nanotechnology 02 engineering and technology Substrate (electronics) 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Capacitance Energy storage 0104 chemical sciences law.invention chemistry.chemical_compound chemistry law General Materials Science Fiber 0210 nano-technology |
| Zdroj: | ACS Applied Materials & Interfaces. 13:14068-14076 |
| ISSN: | 1944-8252 1944-8244 |
| DOI: | 10.1021/acsami.0c19619 |
| Popis: | As the demand for wearable electronic devices increases, interest in small, light, and deformable energy storage devices follows suit. Among these devices, wire-shaped supercapacitors (WSCs) are considered key components of wearable technology due to their geometric similarity to woven fiber. One potential method for creating WSC devices is the layer-by-layer (LbL) assembly technique, which is a "bottom-up" method for electrode fabrication. WSCs require conformal and adhesive coatings of the functional material to the wire-shaped substrate, which is difficult to obtain with other processing techniques such as vacuum filtration or spray-coating. However, the LbL assembly technique produces conformal and robust coatings that can be deposited onto a variety of substrates and shapes, including wires. In this study, we report WSCs made using the LbL assembly of alternating layers of positively charged reduced graphene oxide functionalized with poly(diallyldimethylammonium chloride) and negatively charged Ti3C2Tx MXene nanosheets conformally deposited on activated carbon yarns. In this construct, the added LbL film enhances capacitance, energy density, and power density by 240, 227, and 109%, respectively, relative to the uncoated activated carbon yarn, yielding high specific and volumetric capacitances (237 F g-1, 2193 F cm-3). In addition, the WSC possesses good mechanical stability, retaining 90% of its initial capacity after 200 bending cycles. This study demonstrates that LbL coatings on carbon yarns are promising as linear energy storage devices for fibrous electronics. |
| Databáze: | OpenAIRE |
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