Fabrication of ternary hierarchical nanofibers MnO2/PANI/CNT and theirs application in electrochemical supercapacitors. (15th December 2016)

• Record Type: Journal Article
• Authors: Liu, Wenjie; Wang, Shishuang; Wu, Qianhui; Huan, Long; Zhang, Xiue; Yao, Chao; Chen, Ming
• Is Part Of: Chemical engineering science. Volume 156(2016)
• Page Start: 178
• Page End: 185
• Publication Date: 2016-12-15
• Subjects: Ternary hierarchical nanofibers -- Manganese dioxide -- Polyaniline -- Multiwalled carbon nanotube -- Supercapacitors; Chemical engineering -- Periodicals; Génie chimique -- Périodiques; Chemical engineering; Periodicals; Electronic journals; 660
• DOI: 10.1016/j.ces.2016.09.025
• Languages: English
• ISSNs: 0009-2509

Abstract

Abstract: In this article, ternary coaxial hierarchical nanofibers are prepared by a simple, repeatable, and scalable method. Polyaniline (PANI) is in-situ polymerized on multiwalled carbon nanotubes (MWCNT) to form PANI/MWCNT. Subsequently, manganese dioxide (MnO2 ) in-situ grows on PANI/MWCNT nanofibers to form ternary hierarchical nanofibers MnO2 /PANI/MWCNT. The electrochemical performance of MnO2 /PANI/MWCNT is investigated using cyclic voltammetry (CV), galvanostatic charge-discharge measurement, and electrochemical impedance spectroscopy. The results show that as-prepared ternary hierarchical nanofibers are all typical pseudo-capacitance capacitors. Compared with MWCNT, PANI nanofibers, and PANI/MWCNT composite nanofibers, the specific capacitance of MnO2 /PANI/MWCNT composites exhibits the highest capacitance of 348.5 F g −1 at 1 A g −1, and 88.2% of which can still be maintained after 2000 consecutive cycles. The electrochemical measurements demonstrate that PANI layer and nanoflaky MnO2 can increase the specific capacitance of MWCNT. More important, MnO2 in-situ growth on PANI layer can effectively retain the structure of composites and improve the long-term cycle stability, which is conducive to obtain the new-type portable energy storage devices. Graphical abstract: Highlights: Ternary coaxial hierarchical nanofibers MnO2 /PANI/MWCNT are synthesized. MnO2 /PANI/MWCNT exhibits high specific capacitance of 431.3 F g −1 at 0.5 A g −1 . MnO2 /PANI/MWCNT maintains 88.2% initial capacity after 2000 cycles at 1 A g −1 . Ternary coaxial hierarchical nanostructures improve electrochemical properties.