Harvesting energy from water motion is attractive and is considered as a promising component in a microgenerator system for decentralized energy. Recent developments have been shown to rely on spontaneous electrification at the solid-liquid interface, even though the precise mechanism is still under debate. In this paper, we report that the triple-phase boundary of solid/liquid/air can be quantitatively charged by tuning the work function by modifying a self-assembled monolayer (SAM), where a permanent or redox-active dipole controls the polarity and degree of electrification, and by modulating the electrochemical potential of the solution used. With the simple system proposed here, electricity is successfully delivered to turn on a light-emitting diode (LED), demonstrating the potential applicability of the system for energy harvesters.

从水运动中收集能量很有吸引力，被认为是用于分散能源的微型发电机系统中的一个有前途的组件。最近的发展已被证明依赖于固-液界面的自发带电，尽管确切的机制仍在争论中。在本文中，我们报告了固体/液体/空气的三相边界可以通过修改自组装单分子层 (SAM) 来调整功函数来定量充电，其中永久或氧化还原活性偶极子控制极性和带电程度，并通过调节所用溶液的电化学电位。通过这里提出的简单系统，成功地输送电力以打开发光二极管 (LED)，展示了该系统对能量收集器的潜在适用性。