Journal
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
Volume 65, Issue -, Pages 182-189Publisher
JOURNAL MATER SCI TECHNOL
DOI: 10.1016/j.jmst.2020.07.004
Keywords
Modified nanowires; MOF-derived; Hollow; Core-shell; Double-shell; Energy storage
Funding
- National Natural Science Funds [51821091, 51872233]
- Shaanxi Natural Science Funds [2018JM5044]
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Cu@MOF core-shell nanowires are synthesized by using oxidizable and CTAB-modified metal nanowires as templates and supporting MOFs, forming one-dimensional nanostructures. The resulting CuCo-mixed materials exhibit enhanced electrochemical performance, specific capacitance, and cycling stability, especially when applied in pseudocapacitors.
Cu@MOF core-shell nanowires are synthesized by introducing oxidizable and CTAB-modified metal nanowires as self-engaged templates and supporting MOFs for a one-dimension nanostructure. The following thermal process is controlled to obtain several one-dimension structures of CuCo-mixed materials, such as nanorods, single-shell and double-shell nanowires. The hollow structure for electrode materials enlarges the surface area, provides buffer space for electrolyte to accelerate the ion/charge transfers and for the structure to reduce injuries of volume expansion during cycling. Together with some other merits, such as adequate oxidation of the MOFs, small crystal grains of the material, and well-mixed Cu/Co oxides, the double-shell Cu@MOF nanowires (CuCo-DS5) applied for pseudocapacitors deliver advanced electrochemical performance with a specific capacitance of 563.8 F g(-1) at 1 A g(-1) as well as an outstanding cycling stability with a 92 % retention after 3000 cycles at 5 A g(-1). Meanwhile, an asymmetric pseudocapacitor constructed with the CuCo-DS5 and active carbon (AC) shows a high specific capacitance and energy density. (C) 2020 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.
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