One-step electrodeposited binder-free Co-MOF films and their supercapacitor application

• Published in: Journal of solid state electrochemistry Vol. 28; no. 11; pp. 3973 - 3983
• Main Authors: Cao, Jing, Li, Yang, Wang, Lijun, Qiao, Yongmin, Xu, Jianguang, Li, Jing, Zhu, Luping, Zhang, Suna, Yan, Xixi, Xie, Huaqing
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 01.11.2024; Springer Nature B.V
• Subjects: Activated carbon; Analytical Chemistry; Characterization and Evaluation of Materials; Chemistry; Chemistry and Materials Science; Cobalt; Competitive materials; Condensed Matter Physics; Electrochemical analysis; Electrochemistry; Electrode materials; Electrodeposition; Energy Storage; Ion transport; Metal foams; Metal-organic frameworks; Original Paper; Physical Chemistry; Substrates; Supercapacitors; Thin films; Supercapacitor; Binder free; Electrodeposition; Co-MOF; Thin film
• ISSN: 1432-8488; 1433-0768
• DOI: 10.1007/s10008-024-06001-6

Metal-organic frameworks (MOFs) with redox-active metal ions and a variety of organic linkers have been widely investigated as prospective electrode materials for supercapacitors. Here, we generate uniformly dense spherical particles on a nickel foam substrate by a simple and binder-free one-step electrodeposition method by adjusting the deposition conditions. The active cobalt in the Co-MOF thin films can provide a large number of redox sites for the electrochemical reaction, while the uniform binder-free Co-MOF structure can keep enough contact area with the electrolyte to reduce the ion transport resistance. As-prepared CTB-0.9 (Co-MOF with a deposition voltage of − 0.9 V) thin film has a specific capacitance of 797.5 F g −1 at a current density of 1 A g −1 , exhibiting excellent electrochemical properties. An asymmetric supercapacitor with CTB-0.9 as the positive material and activated carbon as the negative material also demonstrates competitive electrochemical performances, which has a high energy density of 34.3 Wh Kg −1 at a power density of 36,317.6 W Kg −1 . This work may open up an effective approach to realize the electrosynthesis of Co-MOF films, promoting the utilization of Co-based MOFs in energy storage and conversion fields.