TY - JOUR
T1 - Covalent Organic Frameworks as Negative Electrodes for High-Performance Asymmetric Supercapacitors
AU - Kandambeth, Sharath
AU - Jia, Jiangtao
AU - Wu, Hao
AU - Kale, Vinayak Swamirao
AU - Parvatkar, Prakash Tukaram
AU - Czaban-Jóźwiak, Justyna
AU - Zhou, Sheng
AU - Xu, Xiangming
AU - Ameur, Zied Ouled
AU - Abou-Hamad, Edy
AU - Emwas, Abdul-Hamid
AU - Shekhah, Osama
AU - Alshareef, Husam N.
AU - Eddaoudi, Mohamed
N1 - KAUST Repository Item: Exported on 2020-10-01
Acknowledged KAUST grant number(s): OSR-CRG2017-3379
Acknowledgements: S.K. and J. J. contributed equally to this work. This work was financially supported by King Abdullah University of Science and Technology (KAUST) under Award No. OSR-CRG2017-3379. The authors thank Mrinal K. Hota for his valuable help during the electrochemical experiments.
PY - 2020/9/2
Y1 - 2020/9/2
N2 - 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.
AB - 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.
UR - http://hdl.handle.net/10754/665010
UR - https://onlinelibrary.wiley.com/doi/abs/10.1002/aenm.202001673
UR - http://www.scopus.com/inward/record.url?scp=85090059763&partnerID=8YFLogxK
U2 - 10.1002/aenm.202001673
DO - 10.1002/aenm.202001673
M3 - Article
SN - 1614-6832
SP - 2001673
JO - Advanced Energy Materials
JF - Advanced Energy Materials
ER -