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Research Article

Iridium single-atom catalyst for highly efficient NO electroreduction to NH3

Kai Chen1,§, Guohui Wang1,§, Yali Guo1, Dongwei Ma2, Ke Chu1( )
School of Materials Science and Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China
Key Laboratory for Special Functional Materials of Ministry of Education, School of Materials Science and Engineering, Henan University, Kaifeng 475004, China

§ Kai Chen and Guohui Wang contributed equally to this work.

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Graphical Abstract

Atomically dispersed Ir confined in amorphous MoO3 (Ir1/a-MoO3) is reported as a high-performance catalyst for electrochemical NO to NH3 reduction reaction (NORR), which is ascribed to the single-site Ir1-O5 to effectively activate and hydrogenate NO while preferentially absorbing NO over H adatoms to suppress the competing hydrogen evolution.

Abstract

Atomically dispersed Ir confined in amorphous MoO3 (Ir1/a-MoO3) was designed as a high-efficiency catalyst for electrochemical reduction reaction of NO to NH3 (NORR). Atomic precise characterizations reveal that isolated Ir atoms are immobilized in O-vacancies of amorphous MoO3 to form Ir1-O5 moieties. Theoretical computations demonstrate that single-site Ir1-O5 can not only powerfully activate and hydrogenate NO with a near-zero energy barrier, but also exhibit a higher affinity to NO over H adatoms to suppress the competing hydrogen evolution and promote both NORR activity and selectivity. Consequently, Ir1/a-MoO3 shows the maximum NH3 yield rate of 438.8 μmol∙h−1∙cm−2 and NH3-Faradaic efficiency of 93.2%, representing one of the most efficient NORR catalysts to date.

Keywords

electrochemical reduction of NO to NH3single-atom catalystsamorphous materialstheoretical calculations

Electronic Supplementary Material

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Nano Research
Volume 16 Issue 7,
July 2023
Pages 8737-8742
DOI: 10.1007/s12274-023-5556-7
Cite this article:
Chen K, Wang G, Guo Y, et al. Iridium single-atom catalyst for highly efficient NO electroreduction to NH3. Nano Research, 2023, 16(7): 8737-8742. https://doi.org/10.1007/s12274-023-5556-7
Topics:
Electrolytic reduction

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Received: 12 January 2023
Revised: 05 February 2023
Accepted: 06 February 2023
Published: 08 March 2023
© Tsinghua University Press 2023
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