Hydrogel‐based sensors have attracted enormous interest due to their broad applications in wearable devices. However, existing hydrogel‐based sensors cannot integrate satisfying mechanical performances with excellent conductivity to meet the requirements for practical application. Herein, an ionically conductive hydrogel with high strength, fast self‐recovery, and low residual strain is constructed through a facile soaking strategy. The proposed ionically conductive double network hydrogel is achieved by combining chemically crosslinked polyacrylamide and physically crosslinked gelatin network followed by sodium citrate solution immersing. The obtained hydrogel has a tensile strength of 1.66 MPa and an elongation of 849%. The ionically conductive hydrogels can be utilized as both strain and pressure sensors with high sensitivity. Moreover, they can be used as ionic skin to monitor various human movements precisely, demonstrating their promising potential in wearable devices and flexible electronics.

中文翻译：

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离子导电水凝胶具有快速的自恢复能力和低的残余应变，可作为应变和压力传感器。

基于水凝胶的传感器由于其在可穿戴设备中的广泛应用而引起了极大的兴趣。但是，现有的基于水凝胶的传感器无法兼具令人满意的机械性能和出色的电导率，无法满足实际应用的要求。在此，通过简便的浸泡策略构建了具有高强度，快速自恢复和低残留应变的离子导电水凝胶。通过将化学交联的聚丙烯酰胺和物理交联的明胶网络相结合，然后浸入柠檬酸钠溶液，可以实现提出的离子导电双网络水凝胶。所得水凝胶的拉伸强度为1.66MPa，伸长率为849％。离子导电水凝胶可以高灵敏度地用作应变和压力传感器。此外，