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

被引：0
作者：
Kai Chen
Guohui Wang
Yali Guo
Dongwei Ma
Ke Chu
机构：
[1] Lanzhou Jiaotong University,School of Materials Science and Engineering
[2] Henan University,Key Laboratory for Special Functional Materials of Ministry of Education, School of Materials Science and Engineering
来源：
Nano Research | 2023年 / 16卷
关键词：
electrochemical reduction of NO to NH; single-atom catalysts; amorphous materials; theoretical calculations;
D O I：
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中图分类号：
学科分类号：
摘要：
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.
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页码：8737 / 8742
页数：5
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