1. Role of transition metal d-orbitals in single-atom catalysts for nitric oxide electroreduction to ammonia.
- Author
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Kong, Lingyan, Liang, Xiongyi, Wang, Maohuai, and Lawrence Wu, Chi-Man
- Subjects
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ELECTROLYTIC reduction , *NITRIC oxide , *TRANSITION metals , *TRANSITION metal catalysts , *CATALYSTS , *GIBBS' free energy , *DENSITY functional theory - Abstract
[Display omitted] Recently, surging interests exist in direct electrochemical ammonia (NH 3) synthesis from nitric oxide (NO) due to the dual benefit of NH 3 synthesis and NO removal. However, designing highly efficient catalysts is still challenging. Based on density functional theory, the best ten candidates of transition-metal atoms (TMs) embedded in phosphorus carbide (PC) monolayer is screened out as highly active catalysts for direct NO-to-NH 3 electroreduction. The employment of machine learning-aided theoretical calculations helps to identify the critical role of TM-d orbitals in regulating NO activation. A V-shape tuning rule of TM-d orbitals for the Gibbs free energy change of NO or limiting potentials is further revealed as the design principle of TM embedded PC (TM-PC) for NO-to-NH 3 electroreduction. Moreover, after employing effective screening strategies including surface stability, selectivity, the kinetic barrier of potential-determining step, and thermal stability comprehensively studied for the ten TM-PC candidates, only Pt embedded PC monolayer has been identified as the most promising direct NO-to-NH 3 electroreduction with high feasibility and catalytic performance. This work not only offers a promising catalyst but also sheds light on the active origin and design principle of PC-based single-atom catalysts for NO-to-NH 3 conversion. [ABSTRACT FROM AUTHOR]
- Published
- 2023
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