Journal
NANO ENERGY
Volume 56, Issue -, Pages 207-215Publisher
ELSEVIER
DOI: 10.1016/j.nanoen.2018.11.048
Keywords
Longan-like hybrid structures; Hybrid hydrogel; Yolk-shell polypyrrole; Asymmetric supercapacitors
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Funding
- National Natural Science Foundation of China [51672109]
- Natural Science Foundation of Shandong Province for Excellent Young Scholars [ZR2016JL015]
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To effectively avoid the dead volume and improve the utilization ratio of the electrode material, a novel longan-like hybrid structure has been designed and fabricated by controlled growth of Ni(OH)(2) nanosheets on the surface of yolk-shell PPy nanospheres at a mild reaction temperature. The strategy takes full advantages of the hollow structure and further reduces the charge transport distance, leading to high conductivity and energy storage capacity of longan-like hybrid structures. Furthermore, the assembled asymmetric supercapacitors (ASCs) exhibits a high retention ratio of 91.5% for capacitance after 6000 continuous cycles and an impressive energy density of 34 W h kg(-1) at 755 W kg(-1). Remarkably, two devices in series have a higher cell-voltage output of 3.0 V compared to a single device. This work will supply a new hollow nanostructure design strategy to enhance the electrochemical performance of electrode materials.
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