Journal
ELECTROCHIMICA ACTA
Volume 321, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2019.134682
Keywords
Mn-doped coordination supramolecular network; Binder-free electrode; Supercapacitor; Energy storage
Categories
Funding
- National Natural Science Foundation of China [20973203, 91022012, 51472275]
- Guangdong Natural Science Foundation [2014A030313207]
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A new Mn-doped coordination supramolecular network (CSN) was synthesized on nickel foam directly by a simple one-step hydrothermal method. Compared with the pure CSN electrode (similar to 2.46 C cm(-2) at 10 mA cm(-2)), this Mn-doped binder-free electrode showed an ultrahigh areal capacity (similar to 8.12 C cm(-2) at 10 mA cm(-2)). In addition, when the current density increased from 10 mA cm(-2 )to 50 mA cm(-2), it had a good rate capability with 73.33% capacitance retention. For practicality, an asymmetrical supercapacitor (ASC) was assembled by Activated Carbon (AC) electrode and the Mn-doped CSN electrode. The device not only could achieve a maximum energy density of 3.41 mW h cm(-3) at the power density of 44.98 mW cm(-3), but also could exhibit excellent stability after 4000 cycles, with the capacitance retention of 90.14%. The above results indicate that the Mn-doped CSNs are promising electrode materials for supercapacitors in energy storage. (C) 2019 Elsevier Ltd. All rights reserved.
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