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Continuous-flow electrosynthesis of ammonia by nitrogen reduction and hydrogen oxidation. 2023
Xianbiao Fu, and
Jakob B Pedersen, and
Yuanyuan Zhou, and
Mattia Saccoccio, and
Shaofeng Li, and
Rokas Sažinas, and
Katja Li, and
Suzanne Z Andersen, and
Aoni Xu, and
Niklas H Deissler, and
Jon Bjarke Valbæk Mygind, and
Chao Wei, and
Jakob Kibsgaard, and
Peter C K Vesborg, and
Jens K Nørskov, and
Ib Chorkendorff
Department of Physics, Technical University of Denmark, Kongens Lyngby, Denmark.
Ammonia is a critical component in fertilizers, pharmaceuticals, and fine chemicals and is an ideal, carbon-free fuel. Recently, lithium-mediated nitrogen reduction has proven to be a promising route for electrochemical ammonia synthesis at ambient conditions. In this work, we report a continuous-flow electrolyzer equipped with 25-square centimeter-effective area gas diffusion electrodes wherein nitrogen reduction is coupled with hydrogen oxidation. We show that the classical catalyst platinum is not stable for hydrogen oxidation in the organic electrolyte, but a platinum-gold alloy lowers the anode potential and avoids the decremental decomposition of the organic electrolyte. At optimal operating conditions, we achieve, at 1 bar, a faradaic efficiency for ammonia production of up to 61 ± 1% and an energy efficiency of 13 ± 1% at a current density of -6 milliamperes per square centimeter.
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