High specific surface area MXene/SWCNT/cellulose nanofiber aerogel film as an electrode for flexible supercapacitors

• Published in: Composites. Part B, Engineering Engineering, 2023-09, Vol.264, p.110888, Article 110888
• Main Authors: Lyu, Shaoyi, Chang, Huanjun, Zhang, Longfei, Wang, Siqun, Li, Shanming, Lu, Yun, Li, Shujun
• Format: Article
• Language: English
• Subjects: Aerogel film; Carboxylic single-walled carbon nanotubes; Cellulose nanofibers; Flexible supercapacitors; MXene
• ISSN: 1359-8368; 1879-1069
• DOI: 10.1016/j.compositesb.2023.110888

Transition metal carbonitrides (MXene) with two-dimensional layered structures are a recent research topic in the field of supercapacitors. However, because MXene can easily self-stack, its capacitance performance is affected. To this end, one-dimensional cellulose nanofibers (CNF) and carboxylic single-walled carbon nanotubes (SWCNT) were used to intercalate MXene to obtain well-dispersed MXene/SWCNT/CNF aqueous suspensions and their hybrid hydrogels, and to obtain hybrid aerogels through supercritical drying. CNF gives aerogel excellent porosity, a high specific surface area (301.03 m2 g−1), good electrolyte infiltration, and gentle mechanical flexibility, while SWCNT imparts high conductivity to aerogel film. We assembled a symmetrical all-solid-state flexible supercapacitor and interdigitated micro-supercapacitors using an aerogel film as a flexible electrode. The area specific capacity of the above electrode reaches 746.68 mF cm−2 and 244.50 mF cm−2, respectively. This study provides a fabrication method of polymer–inorganic hybrid nanocomposite aerogel film electrodes for flexible supercapacitors. The prepared Ti3C2Tx/SWCNT/CNF aerogel film electrode has good structure and electrochemical properties. [Display omitted]