期刊
COMPOSITES PART B-ENGINEERING
卷 175, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.compositesb.2019.107066
关键词
NiO; PANT; Asymmetric supercapacitor; Porous structure; Spray-dry
资金
- Ministry of Science and Technology [MOST 106-2113-M-152-002-MY2, MOST 107-2221-E-131-009-MY3]
- CPC Corporation [105-3011]
- Taipei Medical University [TMU102-AE1-B02]
- Academia Sinica Research Project on Integrated Thematic Project [AS-107-TP-A09]
- Core Facility Center at Taipei Medical University
In this study, we used a spray-drying method to synthesize a hierarchically structured binary nanocomposite comprising highly porous NiO nanosheets and polyaniline:poly(sodium 4-styrenesulfonate) (PANI:PSS) materials. In this system, the porous NiO nanosheets-obtained through thermal decomposition of beta-Ni(OH)(2) derived from microwave-assisted hydrothermal treatment-dispersed well in the PANI:PSS solution. The homogeneous suspension was then processed through spray-drying and crosslinking of PANI:PSS and GOPS to form NiO/PANI: PSS microspheres. The PANI polymer served as a good conductor and thin spacer that prevented the NiO nanosheets from undergoing layer-to-layer stacking. Moreover, the crosslinked PANI:PSS acted as a binder that held all of the active materials together, leading to high mechanical integrity and excellent water-resistance. Through a synergistic effect in this unique nanoarchitecture, the NiO/PANI:PSS nanocomposite displayed a higher capacitance (834 F/g) at 1 A/g compared with that of NiO (380 F/g) and PANI:PSS (264.5 F/g) individually. Furthermore, the NiO/PANI:PSS composite displayed remarkable rate performance and outstanding cycling life-88.9% retention of specific capacitance after 3000 repeated charge/discharge tests-as a result of its low resistance and high (SSA). We fabricated asymmetric supercapacitors (ASCs) incorporating NiO/PANI:PSS and active carbon (AC) to further explore the capacitive performance of the composite. The as-fabricated devices also delivered remarkable performance, with an energy density of 32.84 Wh/kg, a power density of 375 W/kg, and excellent cycle life.
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