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Self-assembled PANI/CeO2/Ni(OH)2 hierarchical hybrid spheres with improved energy storage capacity for high-performance supercapacitors
被引:31
作者:
Guo, Qingfu
[1
,2
]
Yuan, Jinzhong
[1
,2
]
Tang, Yubao
[1
,2
]
Song, Caixia
[3
]
Wang, Debao
[1
,2
]
机构:
[1] Qingdao Univ Sci & Technol, Key Lab Opt Elect Sensing & Analyt Chem Life Sci, Qingdao 266042, Peoples R China
[2] Qingdao Univ Sci & Technol, Coll Chem & Mol Engn, Qingdao 266042, Peoples R China
[3] Qingdao Univ Sci & Technol, Coll Mat Sci & Engn, Qingdao 266042, Peoples R China
基金:
中国国家自然科学基金;
关键词:
Polyaniline;
Nickel hydroxide;
Cerium oxide;
Hierarchical hybrid spheres;
Supercapacitor;
ELECTROCHEMICAL PERFORMANCE;
ELECTRODE MATERIALS;
GRAPHENE OXIDE;
COMPOSITES;
CARBON;
STATE;
D O I:
10.1016/j.electacta.2020.137525
中图分类号:
O646 [电化学、电解、磁化学];
学科分类号:
081704 ;
摘要:
PANI/CeO2/Ni(OH)(2) hierarchical hybrid spheres were successfully prepared by a simple one-step selfassemble reaction. The structure and morphology characterization revealed the hybrid spheres were constructed with self-assembled nanosheets. The formation mechanism of the hierarchical structure was discussed. N-2 adsorption-desorption isotherms showed that the PANI/CeO2/Ni(OH)(2) had improved specific surface area. Under optimized conditions, the PANI/CeO2/Ni(OH)(2 )hierarchical hybrid spheres showed highly electrochemical activity and supercapacitor performance compared with Ni(OH)(2) and CeO2/Ni(OH)(2). The max specific capacitance reached to 2556 F g(-1). It was still as high as 2130 F g(-1) even at the high current density, showing good rate capability. After 1000 cycles continuous charge-discharge process, the hybrid sphere can retain 95.9% of its initial capacitance, indicating good cycle stability. The asymmetric specific capacitance can be of 348 F g(-1) and the capacity retention rate can hold 80.4% after 8000 cycles. Such high performance of PANI/CeO2/Ni(OH)(2) hybrids may have potential practical application value used in supercapacitors. (C) 2020 Elsevier Ltd. All rights reserved.
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