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In addition, self-healability, a fascinating characteristic of the natural tissues, is also a necessary property of conductive hydrogels, especially for those applied in self-healing electronic skins and bioelectrodes. Self-healable hydrogels can repair themselves in response to damage and recover their original structures and properties, consequently improve the reliability and safety during their functional lifetimes.[11] Selfhealable hydrogel is designed and constructed by introducing dynamic and reversible bonds, including hydrophobic interactions, host–guest interactions, and hydrogen bonds in the hydrogel networks.[11b, 12] Several conductive and healable hydrogels such as polypyrrole/agarose-based hydrogels,[12a, b] have been already developed, however, these hydrogels are not mechanically tough to be comparable with natural tissues.[13] It is a tough job to combine the both outstanding mechanical property and self-healable property into a conductive hydrogel.

Besides the aforementioned functions, another desirable feature missing in previously reported conductive hydrogels for biomedical devices is self-adhesiveness. For example, when worn or attached onto skin, the poor adhesiveness results in interface delamination between the electronic devices and the soft human body. An alternative is to use additional adhesive tapes, such as polyacrylate adhesives, scotch tapes, and