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<p>With the rapid development of renewable energy technologies, droplet electricity generators (DEGs) have emerged as a promising approach to harvest low-frequency and random mechanical energy from falling droplets. However, conventional triboelectric PDMS suffers from a low dielectric constant and charge leakage, limiting charge storage, separation, and output performance. Inspired by the skin structure of planthoppers, we develop a self-powered biomimetic pyramidal-structured DEG based on a fluorinated TiO<sub>2</sub> nanoparticle-decorated pyramid-structured PDMS film (F-TiO<sub>2</sub>@P-PDMS). The resulting micro/nano hierarchical superhydrophobic film exhibits an increased dielectric constant and enhanced electrical output compared with pure PDMS. The device maintains stable performance under both low- and high-frequency droplet impacts. When integrated into a self-powered cathodic protection system, it shifts the corrosion potential of 304 stainless steel from −180 to −390 mV, demonstrating effective corrosion protection. This work offers a strategy for efficient droplet energy harvesting and green anticorrosion applications.</p>

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A Self-powered biomimetic pyramidal-structured droplet generator for cathodic protection against metal corrosion

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年7月9日

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  • Hanzhe Xue,
  • Wenxi Guo

摘要

With the rapid development of renewable energy technologies, droplet electricity generators (DEGs) have emerged as a promising approach to harvest low-frequency and random mechanical energy from falling droplets. However, conventional triboelectric PDMS suffers from a low dielectric constant and charge leakage, limiting charge storage, separation, and output performance. Inspired by the skin structure of planthoppers, we develop a self-powered biomimetic pyramidal-structured DEG based on a fluorinated TiO2 nanoparticle-decorated pyramid-structured PDMS film (F-TiO2@P-PDMS). The resulting micro/nano hierarchical superhydrophobic film exhibits an increased dielectric constant and enhanced electrical output compared with pure PDMS. The device maintains stable performance under both low- and high-frequency droplet impacts. When integrated into a self-powered cathodic protection system, it shifts the corrosion potential of 304 stainless steel from −180 to −390 mV, demonstrating effective corrosion protection. This work offers a strategy for efficient droplet energy harvesting and green anticorrosion applications.