Sustainable supercapacitor electrodes based on preagglomerated carbon onions and a green binder. (September 2022)

• Record Type: Journal Article
• Authors: Bauer, Christian; Bilican, Abdurrahman; Braxmeier, Stephan; Reichenauer, Gudrun; Krueger, Anke
• Is Part Of: Carbon. Volume 197(2022)
• Page Start: 555
• Page End: 562
• Publication Date: 2022-09
• Subjects: Carbon onions -- Energy storage -- Doctor blading -- Carboxymethyl cellulose -- Detonation nanodiamond; Carbon -- Periodicals; Carbone -- Périodiques; Koolstof; Toepassingen; Electronic journals; 546.681
• DOI: 10.1016/j.carbon.2022.06.041
• Languages: English
• ISSNs: 0008-6223

Abstract

Abstract: Supercapacitors play a major role in the field of energy storage. However, the production of highly efficient and durable supercapacitors using sustainable materials remains a challenge. Herein, we report on a green approach for the production of thin film binder electrodes for electric double layer capacitors (EDLCs) based on onion-like carbon. The active material obtained by high temperature treated detonation nanodiamond offers a specific surface area of 527 m 2 g −1 after an additional activation step. The key to facilitate the electrode manufacturing for this active material was the introduction of an agglomeration step of the carbon nano-onions which qualified them for the usage of plant-based carboxymethyl cellulose (CMC) as binder. The new types of electrodes were successfully tested in a supercapacitor full cell setup and benchmarked against electrodes relying on conventional fluorinated polymer (PVDF) as binder. The green electrodes provide about 22% higher specific capacitance of 56 F g −1 at a similar durability over more than 5000 cycles, combining sustainable production with excellent performance. Graphical abstract: Image 1