AUTHOR=Li Xue , Xie Kui 

TITLE=Porous single-crystalline molybdenum nitride enhances electroreduction of nitrogen to ammonia

JOURNAL=Frontiers in Materials

VOLUME=9

YEAR=2022

URL=https://www.frontiersin.org/journals/materials/articles/10.3389/fmats.2022.1097547

DOI=10.3389/fmats.2022.1097547

ISSN=2296-8016

ABSTRACT=<p>The industrial ammonia synthesis reaction has the disadvantage of large energy consumption; thus, the electrochemical reduction method of ammonia synthesis characterized by its clean nature and environmental protectiveness has received extensive attention. Molybdenum nitride is a commonly used electrocatalyst for ammonia synthesis, and its Faraday efficiency is low, which may be due to many internal grain boundaries and few active sites. In this work, we grow microscale porous Mo<sub>2</sub>N single crystals and polycrystalline Mo<sub>2</sub>N from non-porous MoO<sub>3</sub> single crystals. Porous molybdenum nitride materials facilitate charge transport in grain boundaries due to their single-crystal nature and enhance the catalytic properties of ammonia synthesis reactions. Compared with polycrystalline Mo<sub>2</sub>N, the porous Mo<sub>2</sub>N single crystal shows better performance, with a high NH<sub>4</sub><sup>+</sup> yield of 272.56 μg h<sup>−1</sup> mg<sup>−1</sup> and a Faradaic efficiency of 7.3%. In addition, the porous Mo<sub>2</sub>N single crystal exhibits superior long-term stability with little attenuation after 16 h electrolysis reaction. It provides a new method for the catalyst of ammonia synthesis.</p>