Journal
CHEMICAL ENGINEERING JOURNAL
Volume 341, Issue -, Pages 618-627Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2018.02.032
Keywords
Metal-organic framework; Cobaltous sulfide; Hollow nanobox; Electrochemical energy storage
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Funding
- fundamental research funds for the Central Universities [106112015CDJZR305501]
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In this work, hollow CoS nanobox (noted as HCSN) have been successfully synthesized via annealing and hydrothermal process from zeolitic imidazolate framework (ZIF-67) template. When tested as positive electrode materials in alkaline aqueous electrolyte, it shows high specific capacitance of 720 F g(-1) at a current density of 1 A g(-1), good rate capability (82.1%) and good cycling stability with 86.4% capacitance retention over 10,000 cycles at 10 A g(-1). To further demonstrate the advantages of our ZIF-67 derived materials, asymmetric energy storage device was assembled (HCSN//NC), where the as-prepared HCSN was employed as the anode and ZIF67-derived nanoporous carbon (noted as NC) as the cathode. This device achieves high energy density (80 Wh kg(-1) at a specific power density of 882 W kg(-1)), good rate capability (53.3 Wh kg(-1) even at a specific power density of 7.9 kW kg(-1)) and long-term stability up to 10,000 cycles. More importantly, it could simultaneously light up 12 LEDs in parallel, demonstrating its potential in practical applications.
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