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In-situ Raman investigation and application of MXene-stabilized polypyrrole composite for flexible aqueous batteries.
- Source :
-
Materials & Design . May2022, Vol. 217, pN.PAG-N.PAG. 1p. - Publication Year :
- 2022
-
Abstract
- [Display omitted] • A multi-layered MXene-stabilized PPy composite electrode is designed via a facile dip-coating method. • In-situ Raman investigation proves the MXene coating inhibits the irreversible redox reaction of PPy. • The composite electrode shows high specific capacity and long-term stability over 2500 cycles. • A high-performance flexible aqueous battery is effectively assembled for portable/wearable electronics. Although polypyrrole (PPy) has been recognized as a promising organic electrode for rechargeable aqueous batteries (RABs), the practical application is still restricted by its rapid capacity fading after repeated cycles. Herein, a multilayer structural MXene-stabilized PPy (MXene@PPy) composite has been purposefully designed via a facile dip-coating approach, wherein the MXene coating effectively inhibits the structural degradation and irreversible redox reaction of PPy during the electrochemical process, demonstrated by electrochemical measurements combined with in-situ Raman investigation. Density functional theory (DFT) calculation further confirms the obvious electron transfer from MXene to PPy, leading to the formation of electron-rich region on PPy and hole-rich region on MXene, thereby promoting the redox reaction of PPy in the MXene@PPy composite with increased density of states (DOS). As an electrode, the MXene@PPy composite exhibits a large specific capacity of 124.9 mAh g−1 at 1.0 mA cm−2, high coulombic efficiency of ∼100%, superior charge-transfer capability, excellent rate performance and long-term cycling stability with high capacity retention of ∼80.3% over 2500 cycles in acidic aqueous electrolyte. For real application, a high-performance flexible RAB device constructed with such MXene@PPy composite electrode has been substantiated as the efficient power source, revealing its potential applications in high-safety portable/wearable electronics. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 02641275
- Volume :
- 217
- Database :
- Academic Search Index
- Journal :
- Materials & Design
- Publication Type :
- Academic Journal
- Accession number :
- 156780444
- Full Text :
- https://doi.org/10.1016/j.matdes.2022.110606