Perovskite Oxide as A New Platform for Efficient Electrocatalytic Nitrogen Oxidation.

Angew Chem Int Ed Engl

Hefei National Research Center for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, 230026, China.

Published: January 2024

Electrocatalytic nitrogen oxidation reaction (NOR) offers an efficient and sustainable approach for conversion of widespread nitrogen (N ) into high-value-added nitrate (NO ) under mild conditions, representing a promising alternative to the traditional approach that involves harsh Haber-Bosch and Ostwald oxidation processes. Unfortunately, due to the weak absorption/activation of N and the competitive oxygen evolution reaction, the kinetics of NOR process is extremely sluggish accompanied with low Faradaic efficiencies and NO yield rates. In this work, an oxygen-vacancy-enriched perovskite oxide with nonstoichiometric ratio of strontium and ruthenium (denoted as Sr RuO ) was synthesized and explored as NOR electrocatalyst, which can exhibit a high Faradaic efficiency (38.6 %) with a high NO yield rate (17.9 μmol mg  h ). The experimental results show that the amount of oxygen vacancies in Sr RuO is greatly higher than that of SrRuO , following the same trend as their NOR performance. Theoretical simulations unravel that the presence of oxygen vacancies in the Sr RuO can render a decreased thermodynamic barrier toward the oxidation of *N to *N OH at the rate-determining step, leading to its enhanced NOR performance.

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http://dx.doi.org/10.1002/anie.202316097DOI Listing

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