Covalent Organic Frameworks as Negative Electrodes for High-Performance Asymmetric Supercapacitors

Sharath Kandambeth, Jiangtao Jia, Hao Wu, Vinayak Swamirao Kale, Prakash Tukaram Parvatkar, Justyna Czaban-Jóźwiak, Sheng Zhou, Xiangming Xu, Zied Ouled Ameur, Edy Abou-Hamad, Abdul-Hamid Emwas, Osama Shekhah, Husam N. Alshareef, Mohamed Eddaoudi

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

New covalent organic frameworks (COFs), encompassing redox-functionalized moieties and an aza-fused π-conjugated system, are designed, synthesized, and deployed as negative electrodes in asymmetric supercapacitors (ASC), for the first time. The Hex-Aza-COFs are synthesized based on the solvothermal condensation reaction of cyclohexanehexone and redox-functionalized aromatic tetramines with benzoquinone (Hex-Aza-COF-2) or phenazine (Hex-Aza-COF-3). The redox-functionalized Hex-Aza-COFs show a specific capacitance of 585 F g−1 for Hex-Aza-COF-2 and 663 F g−1 for Hex-Aza-COF-3 in a three-electrode configuration. These values are the highest among reported COF materials and are comparable with state-of-the-art pseudocapacitive electrodes. The Hex-Aza-COFs exhibit a wide voltage window (0 to −1.0 V), which allow the construction of a two-electrode ASC device by combining them with RuO2. The complementary potential windows of Hex-Aza-COF-3 and RuO2 enable an asymmetric device with a high voltage window of 1.7 V. The RuO2//Hex-Aza-COF-3 ASC device achieves an energy density value of 23.3 W h kg−1 at a power density of 661.2 W kg−1. The newly developed negative COF materials open new prospects for the development of high-performance ASCs.
Original languageEnglish (US)
Pages (from-to)2001673
JournalAdvanced Energy Materials
DOIs
StatePublished - Sep 2 2020

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