Journal
CHEMICAL ENGINEERING JOURNAL
Volume 352, Issue -, Pages 29-38Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2018.06.181
Keywords
Core-shell heterostructure; Flexible; Nickel-cobalt layered double hydroxide; CoMoO4; All-solid-state asymmetric supercapacitor
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Funding
- National Natural Science Foundation of China [NSFC 51603053]
- Natural Science Foundation of Heilongjiang Province [B2015021]
- Fundamental Research Funds of the Central University
- Application Technology Research and Development Projects of Harbin [2015RAQXJ038]
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Flexible and lightweight wire-shaped supercapacitors are important energy storage devices used for portable or wearable electronics. However, practical applications of flexible supercapacitors are still limited by the relatively poor performances. Herein, the hierarchical carbon cloth@CoMoO4@NiCo-LDH core-shell nanowire arrays supported have been synthesized via a facile two-step hydrothermal route coupled with annealing treatment. In addition, a possible mechanism for the growth of NiCo-LDH nanosheets (NSs) shell onto CoMoO4 nanowires (NWs) core is put forward based on the time-dependent experiments. The CC@CoMoO4@NiCo-LDH-12 h electrode exhibits a high specific capacitance of 2024 F g(-1) at 1 A g(-1), with 80.3% retention of the initial specific capacitance at 20 A g(-1) and outstanding cycling stability. In addition, we have fabricated a flexible all-solidstate asymmetric supercapacitor (ASC) which achieves a maximum energy density of 59.5 Wh kg(-1) at a power density of 800 W kg(-1) and long-term cycling stability (89.7% device capacitance retention over 5000 cycles). The remarkable electrochemical performance can be ascribed to the rational combination of two electroactive materials and the reasonable array configuration.
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