Self-powered electrocatalytic nitrate to ammonia driven by lightweight triboelectric nanogenerators for wind energy harvesting

Ammonia (NH3) is an essential feedstock for modern industry and agriculture, as well as a promising energy carrier owing to its high energy density (4.3 kWh kg(-1)) and storage security. The electrocatalytic nitrate reduction reaction to ammonia (NRA) is a promising alternative route for convenient and distributed NH3 synthesis coupled with clean energy, and is attracting widespread attention. Building a coupled system for NH3 production between NRA and clean energy capture is an exciting direction for future distributed energy utilization and conversion. Herein, a lightweight triboelectric nanogenerators (TENGs) with ultra-low start-up wind speed (3.0 m s(-1)) is coupled to NRA system loaded with polycrystalline copper, enabling energy harvesting in a wide wind speed band for the efficient NH3 production. An adaptation strategy for capacitor embedded in the energy conversion process is proposed to further enhance the efficiency of coupled system, achieving a high NH3 yield of 11.48 mu g cm(-2) h(-1) with the high catalytic activity of polycrystalline copper on cathode. This work opens up a coupled electrocatalysis and natural energy capture system for the conversion of NO3- to NH3, and provides an idea for the renewable energy conversion and nitrogen cycle remediation.

Automated summary

Ammonia (NH3) is an important raw material for modern industry and agriculture, and it is also a promising energy carrier. The electrocatalytic nitrate reduction reaction to ammonia (NRA) is an alternative method for convenient and distributed NH3 synthesis coupled with clean energy. Establishing a coupled system between NRA and clean energy capture is a promising direction for future energy utilization and conversion.