FeO nanostructure films as solar-thermal conversion materials for ammonia synthesis

Here, we report that black photothermal materials elevate solar heating temperatures across high solar absorption and low infrared radiation. Fe 3 O 4 nanostructure films can be heated to 350 °C under light irradiation, and this system shows effective visible-light-driven ammonia synthesis production of 3677 μg g −1 h −1 under gas-solid phase catalysis without noble metals. Fe 3 O 4 film is composed of dispersed nanoparticles and irregular nanopores, where photons can be trapped by multi-reflection. The solar-thermal temperature can raise to above 350 °C and meet the temperature requirement for ammonia synthesis.