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Article Abstract
Harnessing solar energy to convert molecular N into nitrogen-rich chemicals (e.g., ammonia) provides a potential pathway for the manufacture of "solar fertilizers". However, the solar-to-ammonia (STA) efficiency of most solar fertilizer systems developed to date is less than 0.1%. Herein, an outstanding STA efficiency of ≈0.3% using a metallic molybdenum trioxide (metallic MoO) photocatalyst under simulated-solar irradiation is reported, with localized surface plasmon resonance phenomena in the metallic MoO photocatalyst enhancing both light utilization and N activation. The potential scalability of the photocatalytic technology is demonstrated in a 1 m panel reactor system, with a high STA efficiency and good stability demonstrated over 6 days of outdoor testing, yielding a solid (NH)SO product for easy collection. The as-designed square-meter outdoor reaction system facilitates the integration of solar fertilizer technology with existing agricultural infrastructure.
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