Archimedes‐Spiral Triboelectric Nanogenerator Based on Wave Height Amplifiers for Counter‐Phase Wave Energy Harvesting

Liquid–solid triboelectric nanogenerators (TENGs), owing to their high contact efficiency and structural simplicity, are regarded as a promising technological solution for wave energy harvesting. However, their performance is constrained by low spatial utilization efficiency and insufficient wave height under actual sea conditions. Herein, an Archimedes‐spiral triboelectric nanogenerator is constructed through a spiral integrated stacking design strategy, achieving a volumetric charge density of 29.19 mC·m −3 , a volumetric power density of 35.37 W·m −3 , and a triboelectric surface density of 5.55 cm −1 . A wave height amplifier scheme based on Bernoulli's principle and Pascal's law is proposed, which not only delivers a 2.4 fold amplification of wave height but also ensures compatibility with the TENG's internal motion. By constructing an external counter‐phase wave energy harvesting system, wave energy is transmitted to the inner TENG, thereby improving energy harvesting efficiency. The experimental results demonstrate that the device delivers high output charge quantity, voltage and current of 17.88 µC, 845 V, and 127 µA, respectively. Additionally, the device continuously powers two hygrothermographs and three calculators under simulated wave conditions, respectively, and also exhibits outstanding performance in real ocean environments. This study proposes a strategy to advance triboelectric nanogenerators for wave energy harvesting toward all‐weather applications.