Zhipeng Wu,Jun Chen,D.W. Boukhvalov,Zhenyang Luo,Lijun Zhu,Yijun Shi
Triboelectric nanogenerator (TENG) can convert all kinds of mechanical energy into electricity. Comparing with the traditional electromagnetic generator (EMG), TENG has obvious higher efficiency in harvesting low frequency mechanical energy with advantages of much lower cost, smaller size and so on. However, TENG suffers unpredictable damages due to stretching, bending, compression, interface friction, electric breakdown, etc. Materials with self-healing properties provide a good solution to this problem. In this study, a new TENG was developed based on a new type polyurethane-based self-healing elastomer with good mechanical self-healing property (healing efficiency is about 96%) and excellent electric breakdown self-healing performance (healing efficiency is 90%). Self-healing mechanism study indicates that the excellent self-healing properties comes from a combination of intermolecular hydrogen bonding, weak and dynamic coordination bonds between Fe 3+ and pyridine rings. The developed TENG can generate an open-circuit voltage of 180 V, a short-circuit of 1.3 μA, and with a maximum power of 40 mW·m −2 . The developed TENG shows an excellent stability (no output performance degrading even after a 3000 cycles). It is also interesting to find that the output electrical properties of the developed TENG before and even after several times mechanical self-healing or electrical breakdown self-healing can be almost 100% restored to the original state.
Ruiyu Yang,Yujin Yao,Zaihua Duan,Zhen Yuan,Huiling Tai,Yadong Jiang,Yonghao Zheng,Dongsheng Wang
One key limitation of artificial skin-like materials is the shortened service life caused by mechanical damages during practical applications. The ability to self-heal can effectively extend the material service life, reduce the maintenance cost, and ensure safety. Therefore, it is important and necessary to fabricate materials with simultaneously mechanical and electrical self-healing behavior in a facile and convenient way. Herein, we report a stretchable and conductive self-healing elastomer based on intermolecular networks between poly(acrylic acid) (PAA) and reduced graphene oxide (rGO) through a facile and convenient postreduction and one-pot method. The introduction of rGO provides the PAA-GO elastomers with good mechanical stability and electrical properties. Moreover, this material exhibited both electrical and mechanical self-healing properties. After cutting, the elastomers self-healed quickly (∼30 s) and efficiently (∼95%) at room temperature. The elastomers were accurate and reliable in detecting external strain even after healing. The elastomers were further applied for strain sensors, which were attached directly to human skin to monitor external movements, including finger bending and wrist twisting.
危险品化学品经营许可证（带存储）