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Nutshell Powder‐Based Green Triboelectric Nanogenerator for Wind Energy Harvesting

As an agricultural waste, peanut shell powder (PSP) is rich in cellulose and lignin, but its traditional treatment not only has additional disposal costs, but also causes environmental pollution. Here, a low‐cost and environment‐friendly triboelectric nanogenerator based on PSP (PSP‐TENG) is designed for efficient wind energy harvesting. PSP film is used as the tribo‐positive layer, with high surface charge density. The maximum output power density of the PSP‐TENG reaches 365 mW m–2 with a short‐circuit current of 39.4 µA and an open‐circuit voltage of 248.9 V. About 228 commercial LEDs can be lighted up by the wind‐driven PSP‐TENG, which can also be used as a sensor to measure the wind speed. By integrating with capacitor, PSP‐TENG can provide continuous and stable power supply for electronic devices, such as hygrometers, calculators, and stopwatches. Besides, an efficient self‐powered cathodic protection system based on PSP‐TENG is designed for anti‐corrosion for marine pipelines and ships. This work provides a simple and environment‐friendly “waste‐to‐energy technology,” which has a huge application prospect in agricultural waste treatment, new energy, and self‐powered system.