Journal
ELECTROCHIMICA ACTA
Volume 336, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2020.135734
Keywords
NiCo-Layered double hydroxides; Nanosheets; Electrodeposition; Free-standing; Hybrid capacitor
Categories
Funding
- National Natural Science Foundation of China [51674295]
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Although the peculiarities of electrodeposition in the preparation of metal hydroxides is quite attractive, adequate interpretation of this process still lacks. Here, a novel interpretation of the electrodeposition of nickel cobalt double layered hydroxides (NiCo-LDHs) is proposed. Different from the traditional strategies implemented in the pure nitrate or nitrate-assisted electrolytic baths, the sulfate solution with thiourea (TU) additive is used. Benefited from the chelating and inducing effects of TU, honeycomb-shaped NiCo-LDH nanosheets can be successfully electrodeposited on nickel foam (NF). When performed as free-standing electrodes, these integrated electrodes show a robust capacitive performance. Specifically, NC2512-15/NF (deposition for 15 min) electrode can deliver remarkable electrochemical properties, such as large capacity (1198 F g(-1) at 1 A g(-1)), excellent rate performance (1000 F g(-1) at 100 A g(-1)) and good cycling stability. Additionally, the NC2512-15/NF//activated carbon (AC) hybrid capacitor (HC) can sustain extraordinary cycle life (88.3% retention for 10,000 cycles) and high energy density (29.1 Wh kg(-1)), further demonstrating the qualified capacitive behavior of NC2512-15/NF electrode. This work provides a new insight into the electrodeposition of metal LDHs based on the design of the electrolyte solution. (C) 2020 Elsevier Ltd. All rights reserved.
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