Robust, flexible, freestanding and high surface area activated carbon and multi-walled carbon nanotubes composite material with outstanding electrode properties for aqueous-based supercapacitors
| Autor: | Cássio Murilo Moreira, Fernando Cesar Rufino, Davi Marcelo Soares, Leonardo M. Da Silva, Bruno Freitas, Willian G. Nunes, Hudson Zanin |
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| Rok vydání: | 2021 |
| Předmět: |
Supercapacitor
Materials science Equivalent series resistance Buckypaper 02 engineering and technology Carbon nanotube 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Capacitance 0104 chemical sciences law.invention Capacitor Chemistry (miscellaneous) law Electrode Specific energy General Materials Science Composite material 0210 nano-technology |
| Zdroj: | Materials Advances. 2:4264-4276 |
| ISSN: | 2633-5409 |
| DOI: | 10.1039/d0ma00783h |
| Popis: | We report on multi-walled carbon nanotubes (MWCNTs) and an activated carbon (AC) composite material as an electrode for electrical double-layer capacitors (EDLCs). Material flexibility, robustness, and electrical conductivity are features that come from the MWCNTs, while a high specific surface area is an AC's intrinsic property. We prepared different MWCNT : AC ratios in solutions, which were filtered to form a buckypaper. We investigated the specific capacitance, equivalent series resistance, working voltage window (WVW), and the specific energy and power. The best electrochemical findings were obtained for the MWCNT : AC ratio of 1 : 3 with a specific capacitance reaching the theoretical limit. A high working voltage window of 1.4 V was verified in aqueous solution. Simultaneously, the symmetric cells were able to cycle for more than one million cycles in fast charge–discharge galvanostatic tests with 93% capacitance retention. Finally, the main criticism regarding the self-supported electrode materials is the difficulty of welding. In this sense, we presented a particular welding process as proof of concept for electrode scalability. Overall, this novel electrode material exhibits a set of exciting properties, which we now tested in EDLCs. |
| Databáze: | OpenAIRE |
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