Journal
CHEMICAL ENGINEERING JOURNAL
Volume 351, Issue -, Pages 348-355Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2018.06.113
Keywords
Hollow nanotube arrays; Co9S8; Ni-Co LDH; Multicomponent; Supercapacitor
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Funding
- National Natural Science Foundation of China, China [51575135, 51622503, U1537206, 51621091]
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High electrochemical performance of supercapacitor electrodes largely rely on the smart design of nanoarchitectures with scrupulous combination of different active materials. We present a facile method for the multicomponent design of hierarchical Co9S8 hollow nanotubes (CS NTs) wrapped with Ni-Co layered double hydroxides nanosheets (Ni-Co LDH NSs) core-shell high-performance supercapacitors. The CS NTs serve as an ideal backbone with pentagonal cross-section to enhance the conductivity for acting as a superhighway for electron transport, whereas the Ni-Co LDH NSs with high electrochemical activity electrodeposited on the surface of CS NTs provide the electroactive sites and enhance the structural stability for faradaic reaction. The CS NTs@Ni-Co LDH NSs hierarchical electrode presents a high specific capacitance of 1020 C g(-1) and high cycling stability of 90.4% after 10,000 cycles. Moreover, an asymmetric supercapacitor (ASC) was assembled with CS NTs@Ni-Co LDH NSs as the anode and active carbon as cathode. The as-fabricated ASC shows high energy density of 50 Wh kg(-1) and exhibit superior cyclic stability of 86.4% retention over 5000 cycles, suggesting this electrode is promising for efficient electrochemical capacitors.
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