期刊
JOURNAL OF THE TAIWAN INSTITUTE OF CHEMICAL ENGINEERS
卷 134, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jtice.2022.104318
关键词
MWCNT; Supercapacitor; Ternary composite; Spray-dry; NiO
资金
- Ministry of Science and Technology (MOST) of Taiwan [MOST 110-2628-E-011-004, MOST 107-2221-E-011-155-MY3, MOST 108-2221-E-011-163-MY3]
- CPC Corporation
- [105-3011]
In this study, a novel NiO-based composite material was successfully prepared, which exhibited improved conductivity and cycling stability. By using the spray-drying technique, PANI:PSS/NiO (P-NiO) microspheres were synthesized, and MWCNTs decorated with Ni/NiO nanoparticles were fabricated. The modified MWCNTs in the ternary composite acted as an additive to reduce the external resistance between the electrodes, resulting in excellent capacitive performance.
Background: Although high theoretical capacitance, low cost, and superior cycling reversibility make NiO a promising material for preparing supercapacitors, poor conductivity and ionic transport have limited its applicability.Methods: To overcome these drawbacks, in this study we prepared ternary composites from porous NiO nanosheets, polyaniline:poly(sodium 4-styrenesulfonate) (PANI:PSS), and Ni/NiO-decorated multiwalled carbon nanotubes (MWCNTs). Using a spray-drying technique, the conductive PANI:PSS was bound tightly to the porous NiO nanosheets to form PANI:PSS/NiO (P-NiO) microspheres. Here, the PANI:PSS infiltrated the nanopores of NiO and modified the NiO surface, thereby decreasing the internal resistance and avoiding restacking of the NiO nanosheets. Moreover, we synthesized MWCNTs decorated with Ni/NiO dual-phase nanoparticles; here, the deposition of the Ni/NiO nanoparticles improved both the electrical conductivity and capacitive behavior of the MWCNTs.Significant findings: As a result, the modified MWCNTs (m-MWCNTs) functioned as a novel additive that lowered the external resistance among the P-NiO microspheres. An asymmetric supercapacitor employing the designed ternary system and active carbon as electrodes achieved a remarkable specific capacitance of 105.6 F/g at 0.5 A/g, a maximum energy density of 33 W h/kg, and superior cycling stability.(c) 2022 Taiwan Institute of Chemical Engineers. Published by Elsevier B.V. All rights reserved.
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