Electrodeposited binder-free CoMn LDH/CFP electrode with high electrochemical performance for asymmetric supercapacitor
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Carbon fiber paper (CFP)-supported CoMn-layered double hydroxide (LDH) or Co(OH)2 has been obtained using a simple and effective one-step electrodeposition. The binder-free CoMn LDH/CFP electrode displays a much enhanced pseudocapacitive performance with high specific capacitance (980 Fg−1 at 2 Ag−1), outstanding rate capability (79% capacitance retention with the current density from 2 to 32 Ag−1), and long-term life cycle (81% capacitance retention after 10,000 cycles at 32 Ag−1), much superior to that of pure Co(OH)2 (709 Fg−1, 65%, 79%). The improvement of electrochemical performance can be due to the enhancement of electrical conductivity and specific surface area of the freestanding CoMn LDH/CFP electrode, favoring electrochemical efficient and activity of the whole electrode material. And furthermore, an aqueous asymmetric supercapacitor fabricated with the CoMn LDH/CFP-positive electrode and the AC/CFP-negative electrode achieves a high specific capacitance of 53.5 Fg−1 at a wide potential window of 1.6 V and provides a high energy density of 19.1 Whkg−1 at a well power density of 400 Wkg−1. The facile preparation and excellent performance of the CoMn LDH/CFP make it a promising material for energy conversion/storage application.
KeywordsCo-Mn-layered double hydroxides Nano composite materials Asymmetric supercapacitor
Support was received from the National Natural Science Foundation of China (Nos. 51778268, 51802111) and the Projects of Jilin Province Department of Education (No. JJKH20191016KJ).
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