Next-generation wearable electronics is expected to be self-powered by conformable energy storage devices that can provide energy output whenever needed. The emerging energy harvesting and storage integrated system in a flexible assembly, in this respect, has offered a promising solution. Nevertheless, daunting challenges pertaining to the insufficient energy density, limited overall efficiency and low output voltage of the prevailing integrated power sources still exist. Herein, we report a flexible perovskite solar cell (PSC)-driven photo-rechargeable lithium-ion capacitor (LIC) that hybridizes energy harvesting and storage for self-powering wearable strain sensors. Such flexible PSC-LIC module manages to deliver an overall efficiency of 8.41% and a high output voltage of 3 V at a discharge current density of 0.1 A g⁻¹. It could still harvest a remarkable overall efficiency exceeding 6% even at the high current density of 1 A g⁻¹, outperforming state-of-the-art photo-charging power sources. Accordingly, thus-derived, self-powered strain sensor readily manifests precise and continuous data recording of physiological signals without any external power connections, thereby realizing the synergy of energy harvesting, storage, and utilization within one smart system. This multi-field-coupled, function-integrated platform is anticipated to offer significant benefits toward practical self-powered wearable electronics.

下一代可穿戴电子设备有望通过合适的储能设备自供电，该储能设备可以在需要时提供能量输出。在这方面，以柔性组件形式出现的新兴的能量收集和存储集成系统提供了一种有希望的解决方案。然而，仍然存在与普遍的集成电源的不足的能量密度，有限的整体效率和较低的输出电压有关的艰巨挑战。在本文中，我们报告了一种由钙钛矿太阳能电池（PSC）驱动的可光充电锂离子电容器（LIC），该电容器将能量收集和存储混合在一起，用于自供电的可穿戴应变传感器。这种灵活的PSC-LIC模块可在0.1 A g ^-1的放电电流密度下实现8.41％的整体效率和3 V的高输出电压。即使在1 A g ^-1的高电流密度下，它仍然可以获得超过6％的显着总体效率，其性能优于最新的光充电电源。因此，由此衍生的自供电应变传感器无需任何外部电源连接即可轻易地显示出生理信号的精确且连续的数据记录，从而在一个智能系统内实现了能量收集，存储和利用的协同作用。预计该多场耦合，功能集成的平台将为实用的自供电可穿戴电子设备带来巨大的好处。