Liquid–Solid Triboelectric Nanogenerator Arrays Based on Dynamic Electric‐Double‐Layer for Harvesting Water Wave Energy

Abstract In the new energy era, ocean wave energy is recognized as one of the most important clean and renewable energy sources. As an advanced energy technology, developing triboelectric nanogenerators (TENGs) to harvest ocean wave energy has become a promising research direction. However, for most of the current fully enclosed TENGs or liquid–solid TENGs, the industrialization is limited. In this work, a TENG with a new working scheme is proposed for water wave energy harvesting. Through designing the opposite dynamic electric‐double‐layers, the efficient conversion of water kinetic energy into electrical energy is achieved. Moreover, the TENG structure is extended to an array. Under irregular water waves, the TENG array exhibits desired output performance, with the stable output current of 60.0 µA, output voltage of 60.0 V, and average power density of 5.38 W m −3 . Finally, the TENG array is demonstrated to successfully power signal spotlights, the digital thermometer and the water quality detector. This study not only broadens the research ideas for TENGs, but also provides a new mechanism for the ocean wave energy exploitation, which is of great significance to the industrialization of TENGs and blue energy.