Binder-free TiN/graphite based thin film negative electrode for flexible energy storage devices. (May 2023)

• Record Type: Journal Article
• Authors: Ramadoss, Ananthakumar; Tripathy, Alekhika; Mohanty, Ankita; Swain, Nilimapriyadarsini; Kaliaraj, Gobi Saravanan; Noby, Sohaila Z.; Kirubavathi, K.; Selvaraju, K.
• Is Part Of: Vacuum. Volume 211(2023)
• Publication Date: 2023-05
• Subjects: Flexible -- Thin films -- Pseudocapacitors -- Titanium nitride -- Magnetron sputtering; Vacuum -- Periodicals; 621.55
• DOI: 10.1016/j.vacuum.2023.111848
• Languages: English
• ISSNs: 0042-207X

Abstract

Abstract: Transition metal nitrides are trustworthy electroactive materials due to their merits like good electrical conductivity, wettability, multi-oxidation state, and higher specific capacity than metal oxides and carbon materials. In the present work, titanium nitride is deposited over a highly flexible graphite substrate using physical vapour deposition process. The physiochemical studies confirmed the formation of TiN film over the graphite substrate and also exhibited flexible characteristics. The nitrogen content of the electrode provides considerable wettability to the electrode surface while having better conductivity. Noticeably, the as-fabricated negative electrode showed pseudocapacitive property with a good specific capacitance of 86 mF cm − 2 at 1 mA cm − 2 and stable cycling performance with 80% capacitance retention even after 3000 cycles at 3 mA cm − 2 . The results of this study demonstrate that these metal nitrides can be considered as an alternative negative electrode for supercapacitor applications. Highlights: A flexible, bendable and light-weight TiN/graphite electrode was fabricated for energy storage application. Fast, low-cost and scalable current collector preparation for flexible supercapacitors. The fabricated electrode exhibited an areal capacitance of 86 mA cm −2 at 1 mA cm −2 . The flexible electrode retained good stability performance with a retention of 80% at 3 mA cm −2 for 3000 cycles. The TiN/graphite electrode demonstrated better mechanical stability towards flexible electronic applications.