2022/02/09 by Rong Zhang, Ying Guo, Shaoce Zhang +8 · 5 citations
Chemical Engineering · Energy · #Ammonia Synthesis and Nitrogen Reduction #Advanced Photocatalysis Techniques #CO2 Reduction Techniques and Catalysts
paper · doi:10.1002/aenm.202103872
openalex publication_date 2022/02/09 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/27
Abstract The electrocatalytic nitrate reduction reaction (NO 3 ‐RR) to ammonia (NH 3 ) offers a promising alternative approach for NH 3 production and nitrate‐based voltaic cells which can deliver both electricity and NH 3 as products, are also highly attractive. However, nitrate‐to‐NH 3 conversion involves a proton‐assisted multiple‐electron transfer process with considerable kinetic barrier, underlying the need for efficient catalysts for the NO 3 – RR. A Zn‐nitrate battery is reported to enable a “killing three birds with one stone” strategy for energy supply, ammonia production and removal of pollutants with the iron doped nickel phosphide (Fe/Ni 2 P) as a NO 3 – RR catalyst electrode. Iron doping induces a downshift of the d‐band center of Ni atoms to the Fermi level, allowing the optimization of Gibbs free energies for reaction intermediates. The Fe/Ni 2 P catalyst exhibits 94.3% NH 3 Faradaic efficiency (FE) and nearly 100% nitrate conversion efficiency at –0.4 V vs. reversible hydrogen electrode (RHE). Further applying this highly efficient NO 3 – RR electrocatalyst as the cathode material, a novel Zn‐nitrate battery exhibits a power density of 3.25 mW cm –2 and a FE of 85.0% for NH 3 production. This work enriches the application of Zn‐based batteries in the field of electrocatalysis and highlights the promise of bimetal phosphide for the NO 3 – RR.