期刊
ADVANCED SCIENCE
卷 7, 期 2, 页码 -出版社
WILEY
DOI: 10.1002/advs.201901144
关键词
conjugated polymers; electroactive materials; hydrogels; volume change
资金
- Knut and Alice Wallenberg Foundation
- Wallenberg Wood Science Center [KAW 2018.0452]
- Swedish Research Council (VR)
- Swedish Government Strategic Research Area in Materials Science on Advanced Functional Materials at Linkoping University (Faculty Grant SFO-Mat-LiU) [2009-00971]
- Engineering and Physical Sciences Research Council [EP/G037515/1, EP/N509486/1]
Conjugated polymers exhibit electrically driven volume changes when included in electrochemical devices via the exchange of ions and solvent. So far, this volumetric change is limited to 40% and 100% for reversible and irreversible systems, respectively, thus restricting potential applications of this technology. A conjugated polymer that reversibly expands by about 300% upon addressing, relative to its previous contracted state, while the first irreversible actuation can achieve values ranging from 1000-10 000%, depending on the voltage applied is reported. From experimental and theoretical studies, it is found that this large and reversible volumetric switching is due to reorganization of the polymer during swelling as it transforms between a solid-state phase and a gel, while maintaining percolation for conductivity. The polymer is utilized as an electroactive cladding to reduce the void sizes of a porous carbon filter electrode by 85%.
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