期刊
APPLIED SURFACE SCIENCE
卷 452, 期 -, 页码 113-122出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2018.05.028
关键词
Nanostructures; All solid state; Supercapacitor; Energy storage devices
类别
资金
- National Natural Science Foundation of China [21503025, 11332013]
- Key Project of Natural Science Foundation of CQ CSTC [cstc2017jcyjBX0063]
- Chongqing Research Program of Basic Research and Frontier Technology [cstc2016jcyjA0366]
Developing supercapacitors with high energy density, good rate capability, and superior cycle life is crucial to the ever-increasing energy storage devices. However, how to develop novel electrodes materials and build a new type of nanostructures with large surface area, low resistance, and stable microstructures is still a challenge work. Fortunately, there is an effective strategy by designing the rational core-shell nanostructures as binder-free electrode materials to improve the electrochemical performance of supercapacitors. Herein, we have successfully realized a high-energy-density, good-rate-capability and longlife all-solid-state symmetric supercapacitor (SSC) by developing the hierarchical 3D NiCo2O4@ZnWO4 core-shell structures for the first time. The free-standing SSC based on the nanosheet arrays core-shell structures gives rise to a high areal capacitance of 288.4 mF cm(-2) at a current density of 4 mA cm(-2) and 248.9 mF cm(-2) even at a current density of 40 mA cm(-2), a high energy density of 28.46 Wh kg(-1) at 0.79 kW kg(-1), and similar to 97.5% of the capacitance can be retained after 5000 cycles of charge-discharge. The remarkable electrochemical behaviors demonstrate that the nickel foam supported NiCo2O4@ZnWO4 nanosheet arrays electrodes are highly desirable for application as high-performance electrochemical energy storage devices. (C) 2018 Elsevier B.V. All rights reserved.
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