MoS2 decorated carbon fiber yarn hybrids for the development of freestanding flexible supercapacitors

Carvalho, José Tiago; Correia, Afonso; Cordeiro, Neusmar J. A.; Coelho, João; Lourenço, Sidney A.; Fortunato, Elvira; Martins, Rodrigo; Pereira, Luís

http://hdl.handle.net/10362/173334

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Autores

Carvalho, José Tiago

Correia, Afonso

Cordeiro, Neusmar J. A.

Resumo(s)

Academic and industrial efforts have focused on developing energy storage devices for wearable and portable electronics using low-cost, scalable, and sustainable materials and approaches. In this work, commercially available stretch-broken carbon fiber yarns (SBCFYs) were hybridized with mixed phases of 1 T and 2H MoS2 nanosheets via conventional and microwave-assisted heating (CAH, MAH) without the use of binders to fabricate symmetric freestanding 1D fiber-shaped supercapacitors (FSCs). Electrochemical characterization performed in a three-electrode configuration showed promising results with specific capacitance values of 184.41 and 180.02 F·g−1, at 1 mV·s−1 for CAH and MAH, respectively. Furthermore, after performing 3000 CV cycles at 100 mV·s−1, the capacitance retention was 79.5% and 95.7%, respectively. Using these results as a reference, symmetric 1D FSCs were fabricated by pairing hybridized SBCFYs with MoS2 by MAH. The devices exhibited specific capacitances of approximately 58.60 ± 3.06 F·g−1 at 1 mV·s−1 and 54.81 ± 7.34 F·g−1 at 0.2 A·g−1 with the highest power density achieved being 15.17 W·g−1 and energy density of 5.06×10–4Wh·g−1. In addition, five 1D FSCs were hand-stitched and connected in series onto a cotton fabric. These supercapacitors could power a temperature and humidity sensor for up to six minutes, demonstrating the practicality and versatility of the prepared 1D FSCs for powering future electronic systems.

Descrição

IDS-FunMat-INNO project FPA2016/EIT/EIT RawMaterials Grant Agreement 17184. The authors would also like to thank Daniela Gomes, Jonas Deuermeier, Maria João Oliveira, and Sofia Ferreira from CENIMAT|i3N for contributing to SEM, XPS, RAMAN, and XRD measurements, respectively. Carla Rodrigues and Nuno Costa for providing access to the Mettler Toledo AT21 Comparator microscale. Publisher Copyright: © The Author(s) 2024.

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General Chemistry General Materials Science Condensed Matter Physics Mechanics of Materials Mechanical Engineering SDG 9 - Industry, Innovation, and Infrastructure