Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 787, Issue -, Pages 694-699Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2019.02.134
Keywords
Triple-shelled; Hollow microsphere; CuCo2O4; Cycling durability; Supercapacitor
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Funding
- National Natural Science Foundation of China [61774033]
- Key R&D Program of Ministry of Science and Technology of China [2018YFC1803100]
- Priority Academic Program Development of Jiangsu Higher Education Institutions [1107047002]
- Southeast University-Nanjing Medical University Cooperative Research Project [2242018K3DN32]
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The triple-shelled hollow CuCo2O4 (T-CuCo2O4) microspheres were synthesized by a solvothermal/calcination method. The unique structure with a large internal void volume and porous distribution shortened the ions/electrons transport distance and strengthened the electrochemical reaction. The triple-shelled architecture buffered the volume expansion/contraction to enhance structural stability due to the reduced stress and strain during the charge/discharge process. As a three-electrode cell, the TCuCo2O4 electrode demonstrated a specific capacitance of 691 F/g (current density: 1 A/g), rate capability of 470 F/g (current density: 20 A/g) and capacitance retention of 93% after 6000 cycles. The all-solid-state asymmetrical supercapacitor achieved an energy density of 25.2Wh/kg at a power density of 1.05 kW/kg, using activated carbon as a negative electrode. The specific capacitance can still maintain 80.3 F/g at a current density of 2 A/g with 6% capacity loss after 2000 cycles. (C) 2019 Published by Elsevier B.V.
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