Journal
SOLID STATE SCIENCES
Volume 84, Issue -, Pages 51-56Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.solidstatesciences.2018.08.007
Keywords
Nanosheet arrays; Microstructure; Nanocomposites; Supercapacitor electrode; Electrochemical performance
Funding
- National Natural Science Foundation of China [21503025, 11332013]
- Chongqing Research Program of Basic Research and Frontier Technology [cstc2016jcyjA0366]
- Fundamental Research Funds for the Central Universities [2018CDXYHK0016]
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Constructing ZnCo2O4 nanosheet arrays (NSAs)@MnO2 nanosheets core-shell nanostructures directly on the current collector (Ni foam) was successfully realized via hydrothermal process and heat treatment. The whole surfaces of uniform ZnCo2O4 NSAs were covered with well-ordered MnO2 nanosheets, which make the whole system have a large specific surface area. At a low current density of 2 mA cm(-2), supercapacitor electrode made of ZnCo2O4@MnO2 composite gave rise to a superior specific capacity about 929.2 C g(-1). Although at an ultrahigh current density of 40 mA cm(-2), it still kept a satisfactory specific capacity about 751.1 C g(-1), and retained 95.75% of the capacity even after 5000 cycles. Because of the synergistic effect between ZnCo2O4 and MnO2 and the great surface area of the system with the special core-shell structure, ZnCo2O4@MnO2 composite has the excellent rate performance, considerable capacity, and quite good cycle performance, which make it a candidate for a new generation of superior-performance electrochemical supercapacitors.
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