期刊
ELECTROCHIMICA ACTA
卷 283, 期 -, 页码 1401-1410出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2018.07.099
关键词
NiO/rGO nanoarchitecture; Ionic liquid; Ionogel polymer electrolyte; Solid-state supercapacitors
资金
- National Key R&D Program of China [2016YFB0100303]
- International Cooperation and Exchange of the National Natural Science Foundation of China [51561145020]
- CAS/SAFEA International Partnership Program for Creative Research Teams [20140491518]
Hierarchical NiO/reduced graphene oxide (rGO) nanohybrids with tunable microstructures were fabricated via the thermal decomposition of Ni(OH)(2)/rGO formed by the electrostatic attraction between exfoliated Ni(OH)(2) and GO nanosheets. Characterization study revealed that the size of intercalated NiO nanocrystals could be tuned from 2 nm to 10 nm, and the specific surface area of optimized nanohybrids reached to 255 m(2)/g. Ionogel polymer electrolyte was prepared by entrapping ionic liquid (EMImBF(4)) and lithium salt (LiTFSI) into copolymer (PVdF-HFP). Effect of NiO particle size on the electrochemical performances was evaluated systemically. Asymmetric supercapacitors with as-prepared nanohybrids as anode and commercial activated carbon as cathode were assembled. Aqueous 6 M KOH solution, organic LiPF(6)solution and ionogel polymer were utilized as electrolytes to check their compatibility with nanohybrids. Our study shows that supercapacitors exhibit energy densities of 31.6 Wh/kg, 49 Wh/kg and 146 Wh/kg, respectively, with the above mentioned electrolytes. These results clearly demonstrate that high performance can be actualized by the subtle combination of hybridized electrodes with high voltage formulated ionogel polymer electrolytes. (C) 2018 Elsevier Ltd. All rights reserved.
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