Electricity generators by driving movement of liquid droplet or flow on the surface of nanocarbon materials represent an emerging means to harvest energy from nature and environment, which have widely potential applications in the fields of sensors, biomedicine, energy conversion, and so on. Herein, a tubular electricity generator with magnetic droplet encapsulated in a continuous graphene tube is developed. The droplet in tubular electricity generators can be easily driven by magnetic force, during which a potential difference ranging from 196 to 419 mV can be realized by tuning the salt species in the droplet. The value of the generated potential difference is among the highest range, compared with other electricity generators reported previously. In addition, in‐series connecting effect could be achieved with multi‐droplet encapsulated in one single electricity generator, resulting in multifold output voltage of device with one droplet. The work provides a powerful strategy to build electricity generator with high output voltage and easy manipulation, and the tubular devices are promising to be used for biomedical and/or wearable electronics.

中文翻译：

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磁力驱动液滴驱动的高性能管状发电机

通过驱动液滴或纳米碳材料表面上的流动运动的发电机代表了一种从自然和环境中收集能量的新兴手段，在传感器，生物医学，能量转换等领域具有广泛的潜在应用。在此，开发了将磁性液滴封装在连续的石墨烯管中的筒状的发电机。管状发电机中的液滴可以很容易地被磁力驱动，在此期间，通过调节液滴中的盐类，可以实现196至419 mV的电位差。与先前报道的其他发电机相比，所产生的电势差值在最高范围之内。此外，通过将多液滴封装在一个发电机中，可以实现串联连接效果，从而使设备的输出电压增加一滴。这项工作为建立具有高输出电压和易于操纵的发电机提供了有力的策略，管状设备有望用于生物医学和/或可穿戴电子设备。