Multi‐Track Triboelectric Nanogenerator Toward Omnidirectional Ocean Wave Energy Harvesting

Abstract Triboelectric nanogenerators (TENGs) present a great potential approach for low‐frequency blue energy harvesting due to their unique advantages, however, omnidirectional wave energy harvesting remains challenging in complex marine environments. Herein, an omnidirectional multi‐track spherical structure TENG (OMS‐TENG) based on eight‐track fan type TENG (FTENG) is developed for harvesting low‐frequency ocean energy. The diameter and number of PTFE balls are optimized theoretically for boosting individual FTENG output and verified experimentally. The connection mode between different tracks and layers of OMS‐TENG is further investigated for efficient omnidirectional ocean energy harvesting. The motion parameters including translation and oscillation on electrical output performances of OMS‐TENG are systematically investigated and optimized. OMS‐TENG has proved to be an efficient device for harvesting omnidirectional wave energy with excellent stability and durability in complex marine environments. The maximum instantaneous power of 1270 µW can be obtained by individual OMS‐TENG. This work provides an effective approach toward omnidirectional ocean energy harvesting and important guidance for designing sustainable energy harvester.