期刊
ACS NANO
卷 16, 期 5, 页码 8347-8357出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.2c02606
关键词
quasi-solid thermocells; eco-friendly energy-harvesting materials; hierarchically anisotropic networks; mechanical toughness; ionic conductivity
类别
资金
- National Natural Science Foundation of China [52036006, 51725602]
This research overcomes the trade-off between ion conductivity and mechanical properties by designing anisotropic polymer networks, leading to a significant increase in ion conductivity. The material achieves biomimetic strain-stiffening and shows significant improvements in toughness and strength.
The rapid growth of wearable systems demands sustainable, mechanically adaptable, and eco-friendly energy-harvesting devices. Quasi-solid ionic thermocells have demonstrated the capability of continuously converting low-grade heat into electricity to power wearable electronics. However, a trade-off between ion conductivity and mechanical properties is one of the most challenging obstacles for developing high-performance quasi-solid thermocells. Herein, the trade-off is overcome by designing anisotropic polymer networks to produce aligned channels for ion-conducting and hierarchically assembled crystalline nanofibrils for crack blunting. The ionic conductivity of the anisotropic thermocell has a more than 400% increase, and the power density is comparable to the record of state-of-the-art quasi-solid thermocells. Moreover, compared with the existing quasi-solid thermocells with the optimal mechanical performance, this material realizes biomimetic strain-stiffening and shows more than 1100% and 300% increases in toughness and strength, respectively. We believe this work provides a general method for developing high-performance, cost-effective, and durable thermocells and also expands the applicability of thermocells in wearable systems.
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