The green energy present in flowing water is underused owing to lack of environmentally acceptable and sustainable energy harvesting technologies. The triboelectric nanogenerators (TENGs) have received significant attention as a prospective technological advancement due to their simple structure and multiple working modes. Among them, the single electrode mode TENGs with no moving parts could facilitate the development of innovative sustainable energy harvesting technologies. Here, a polytetrafluoroethylene (PTFE)-copper (PC-TENG) tube with single electrode mode is developed for harvesting flowing water energy. Using tap water as a source, the PC-TENG tube, with a length of 40 cm and a diameter of 10 mm achieves a maximum power of 45 µW at a load resistance (R_L) of 5 MΩ. The sustainable power generation is demonstrated by powering light emitting diodes (LEDs) and a scientific calculator with tap water flowing at a rate of 2.5 L min⁻¹. Finally, the practical feasibilities of the proposed PC-TENG are demonstrated as self-powered sensor in two biomedical applications such as continuous wireless monitoring of IV drips injection, cardiac cycle and heart rate using a phantom. This work has great potential for the development of single electrode TENGs for continuous power generation and self-powered sensor applications.

由于缺乏环境可接受和可持续的能量收集技术，流动水中的绿色能源未被充分利用。摩擦纳米发电机（TENGs）由于其简单的结构和多种工作模式而作为一项前瞻性的技术进步而受到广泛关注。其中，没有运动部件的单电极模式 TENG 可以促进创新的可持续能量收集技术的发展。在这里，开发了一种具有单电极模式的聚四氟乙烯 (PTFE)-铜 (PC-TENG) 管，用于收集流水能量。以自来水为源，长 40 cm、直径 10 mm 的 PC-TENG 管在负载电阻（R _L) 的 5 兆欧。^{通过以 2.5 L min -1}的自来水流量为发光二极管 (LED) 和科学计算器供电来证明可持续发电。最后，证明了所提出的 PC-TENG 作为自供电传感器在两个生物医学应用中的实际可行性，例如使用体模连续无线监测 IV 滴注、心动周期和心率。这项工作对于开发用于连续发电和自供电传感器应用的单电极 TENG 具有巨大潜力。