期刊
ADVANCED ENERGY MATERIALS
卷 6, 期 21, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.201600969
关键词
freestanding polymer film; high capacitance supercapacitors; MXene; polypyrrole; ultra-stable cycling ability
类别
资金
- Early Career Scheme of the Research Grants Council of Hong Kong SAR, China [U9041997]
- NSFC/RGC Joint Research Scheme [N_CityU123/15]
- Science Technology and Innovation Committee of Shenzhen Municipality [JCYJ20130401145617276]
- City University of Hong Kong, National Natural Science Foundation of China [91226202, 91426304]
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDA02040105, XDA03010305]
- CAS Interdisciplinary Innovation Team
- Major Project of the Ministry of Science and Technology of China [2015ZX06004-001]
Though polypyrrole (PPy) is widely used in flexible supercapacitors owing to its high electrochemical activity and intrinsic flexibility, limited capacitance and cycling stability of freestanding PPy films greatly reduce their practicality in real-world applications. Herein, we report a new approach to enhance PPy's capacitance and cycling stability by forming a freestanding and conductive hybrid film through intercalating PPy into layered Ti3C2 (l-Ti3C2, a MXene material). The capacitance increases from 150 (300) to 203 mF cm(-2) (406 F cm(-3)). Moreover, almost 100% capacitance retention is achieved, even after 20000 charging/discharging cycles. The analyses reveal that l-Ti3C2 effectively prevents dense PPy stacking, benefiting the electrolyte infiltration. Furthermore, strong bonds, formed between the PPy backbones and surfaces of l-Ti3C2, not only ensure good conductivity and provide precise pathways for charge-carrier transport but also improve the structural stability of PPy backbones. The freestanding PPy/l-Ti3C2 film is further used to fabricate an ultra-thin all-solid-state supercapacitor, which shows an excellent capacitance (35 mF cm(-2)), stable performance at any bending state and during 10000 charging/discharging cycles. This novel strategy provides a new way to design conductive polymer-based freestanding flexible electrodes with greatly improved electrochemical performances.
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