Bismuth Ferrite as an Electrocatalyst for the Electrochemical Nitrate Reduction.
basic_science · Level V
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- Record sourced from PubMed, PMID 35775837.
- Also identified by DOI 10.1021/acs.nanolett.2c02026.
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Abstract
Electrochemical nitrate reduction has become an appealing "waste-to-wealth" approach for sustainable NH<sub>3</sub> synthesis owing to its mild operating conditions. However, developing catalysts with high activities and Faradaic efficiencies for this complicated eight-electron reaction is a great challenge. Herein, bismuth ferrite (BiFeO<sub>3</sub>) flakes, with a distorted perovskite-type structure, are demonstrated to be excellent catalysts for electrochemical NH<sub>3</sub> synthesis via nitrate reduction, with a maximum Faradaic efficiency of 96.85%, NH<sub>3</sub> yield of 90.45 mg h<sup>-1</sup> mg<sub>cat</sub><sup>-1</sup>, at -0.6 V <i>vs.</i> reversible hydrogen electrode. During the nitrate reduction reaction, the crystalline BiFeO<sub>3</sub> rapidly converts into an amorphous phase, which is stable in the long term reaction. These results open a new window for rational design of more active and durable electrocatalysts.