Abstract
Herein, we demonstrate the formation of fiber electrodes on a carbon fiber (CF) bundle with a surface that is mesostructured by single-walled carbon nanotubes via colloidal self-assembly. The three-dimensional ordered structure of the fiber electrodes (M-CNT@CF) provides porosity and bicontinuous paths for charge transport, resulting in high energy and considerable rate retention capability as compared with nonstructured CF and CNT-coated CF electrodes. A fiber micro-supercapacitor (f-MSC) composed of a twisted pair of fiber electrodes with a solid polymer electrolyte shows significant capacitance (355 mF cm-3), rate retention capability (92% of low-current capacitance), and considerable cycle stability (99% retention of initial capacitance) for at least 7000 charge-discharge cycles and even under severe mechanical stress. In particular, M-CNT@CF is a promising template for active materials experiencing a Faradic reaction, such as manganese oxide (MnO2). As an added benefit of MnO2 plating, the capacitance of the resulting hybrid fiber electrodes (MnO2@M-CNT@CF) is 6.6 times greater than that of M-CNT@CF. This also demonstrates that the MnO2 plating significantly contributes to performance improvement when applied to the mesostructured electrode (M-CNT@CF) rather than a nonporous material (CF).
Original language | English (US) |
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Pages (from-to) | 13716-13724 |
Number of pages | 9 |
Journal | ACS Applied Energy Materials |
Volume | 4 |
Issue number | 12 |
DOIs | |
State | Published - Dec 27 2021 |
Externally published | Yes |
Keywords
- carbon fiber
- colloidal crystal
- energy storage
- fiber electrode
- micro-supercapacitor
ASJC Scopus subject areas
- Chemical Engineering (miscellaneous)
- Energy Engineering and Power Technology
- Electrochemistry
- Materials Chemistry
- Electrical and Electronic Engineering