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Theoretical Insights into Superior Nitrate Reduction to Ammonia Performance of Copper Catalysts
Abstract
Nitrate reduction to ammonia (NRA) is critical and attractive for environmental remediation and energy conservation. Copper represents one of the most promising non-noble-metal NRA electrocatalysts while its intrinsic catalytic activity of facets and pH influence remain unclear. Using density functional theory calculations, nitrate reduction to ammonia pathways are evaluated on low-index crystal surfaces, Cu(111), Cu(100), and Cu(110), at different pH. Systematic thermodynamic and kinetic analysis indicates that the pathway NO 3 – → *NO 3 → *NO 2 → *NO → *NOH → *NHOH → *NH → *NH 2 → *NH 3 → NH 3 (g) is the most probable in all pH ranges, ending a long-standing debate on NRA pathways. Both the catalytic deoxygenation and hydrogenation processes in NRA are substantially affected by pH. Thus, the rate-determining steps and overpotentials exhibit pH-dependent characteristics. Besides, it is found that the pH influences the competition between the hydrogen evolution reaction (HER) and NRA. By considering NRA and HER on different surfaces, we found that Cu(100) and Cu(111) contribute most to NRA other than Cu(110). Specifically, in near-neutral and alkaline environments, Cu(111) exhibits the best NO 3 – to NH 3 performance, while Cu(100) is more effective in a strong acidic environment. This result rationalizes recent experimental observations. The NRA activity differences of copper surfaces are attributed to the local coordination environment and electronic states of surface atoms. Thanks to a stereospecific Cu–Cu couple, both strong *NOH adsorption and weak *NH 3 adsorption are realized on Cu(111) and Cu(100), facilitating superior NRA.
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Metadata
- Authors
- Hu, T., Wang, C., Wang, M., Li, C. M., & Guo, C.
- Venue
- ACS Catalysis
- Publisher
- American Chemical Society (ACS)
- Published
- 2021-11-15
- Volume
- 11
- Issue
- 23
- Pages
- 14417-14427
- ISSN
- 2155-5435 (ISSN-L)
- OpenAlex
- W3212240724
- Cited by
- 486
- References
- 46
- FWCI
- 11.95
- Type
- journal article
- Language
- en
- Open access
- closed
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