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General synthesis of high-entropy single-atom nanocages for electrosynthesis of ammonia from nitrate. | LitMetric

AI Article Synopsis

  • There is an urgent need for efficient ammonia production due to increased focus on energy efficiency, sustainability, and agricultural needs, particularly through decentralized methods.
  • A new method involving the electrochemical conversion of nitrate ions from wastewater into ammonia is presented, overcoming some challenges in production scalability.
  • The study introduces HESA NCs, which incorporate iron and five other metals, resulting in a catalyst that shows high selectivity and efficiency for ammonia production from nitrate reduction.

Article Abstract

Given the growing emphasis on energy efficiency, environmental sustainability, and agricultural demand, there's a pressing need for decentralized and scalable ammonia production. Converting nitrate ions electrochemically, which are commonly found in industrial wastewater and polluted groundwater, into ammonia offers a viable approach for both wastewater treatment and ammonia production yet limited by low producibility and scalability. Here we report a versatile and scalable solution-phase synthesis of high-entropy single-atom nanocages (HESA NCs) in which Fe and other five metals-Co, Cu, Zn, Cd, and In-are isolated via cyano-bridges and coordinated with C and N, respectively. Incorporating and isolating the five metals into the matrix of Fe resulted in Fe-C active sites with a minimized symmetry of lattice as well as facilitated water dissociation and thus hydrogenation process. As a result, the Fe-HESA NCs exhibited a high selectivity toward NH from the electrocatalytic reduction of nitrate with a Faradaic efficiency of 93.4% while maintaining a high yield rate of 81.4 mg h mg.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC11322612PMC
http://dx.doi.org/10.1038/s41467-024-51112-3DOI Listing

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