Triboelectric nanogenerators (TENGs) have recently drawn much attention in the field of biomechanical energy harvesting and motion monitoring. However, the electrode stretchability and contact-separation model induced complicated packed structure remain a problem that heavily affects output performance during various human movements and requires to be urgently addressed. Here, a single-electrode piezo-triboelectric hybrid nanogenerator (SEP-TENG) integrated with stretchable liquid-metal metal electrodes is reported, which simultaneously achieves outstanding energy harvesting performance and skin-comfort human motion monitoring. A polarized piezoelectric BaTiO₃/silicon rubber (SR) composites film is served as the effective negative tribomaterial, benefiting from the improved dielectric constant and piezoelectric charge transfer, the optimized SEP-TENG generates a high peak power density of 5.7 W/m² while contacted with human skin. Besides, owing to the ultralow Young's modulus of the SR encapsulation layer and tribo-piezoelectric hybrid layer, the homogeneous integrated multilayer composite serves no break till a 745% elongation, promoting that the SEP-TENG could effectively harvest biomechanical energy and realize stable power supplying for wearable electronics even under large deformation state. Furthermore, the SEP-TENG could comfortably attach to the finger joints and collect bending energy. This work provides a novel design methodology for a single-electrode TENG to realize omnidirectional biomechanical energy harvesting and motion monitoring.

摩擦纳米发电机（TENGs）最近在生物力学能量收集和运动监测领域引起了广泛关注。然而，电极可拉伸性和接触分离模型导致的复杂堆积结构仍然是严重影响各种人体运动过程中输出性能的问题，亟待解决。在这里，报道了一种与可拉伸液态金属金属电极集成的单电极压电-摩擦电混合纳米发电机（SEP-TENG），它同时实现了出色的能量收集性能和皮肤舒适的人体运动监测。极化压电 BaTiO ₃/硅橡胶（SR）复合薄膜作为有效的负摩擦材料，得益于改善的介电常数和压电电荷转移，优化后的SEP-TENG产生5.7 W/m ^{2的高峰值功率密度}在与人体皮肤接触时。此外，由于SR封装层和摩擦压电混合层的超低杨氏模量，均质的集成多层复合材料在745%的伸长率下没有断裂，促进了SEP-TENG可以有效地收集生物力学能量并实现稳定供电。即使在大变形状态下也适用于可穿戴电子产品。此外，SEP-TENG 可以舒适地附着在手指关节上并收集弯曲能量。这项工作为单电极TENG提供了一种新颖的设计方法，以实现全方位的生物力学能量收集和运动监测。