PdCu Electrocatalysts for Selective Nitrate and Nitrite Reduction to Nitrogen Article Swipe
YOU?
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· 2022
· Open Access
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· DOI: https://doi.org/10.1021/acscatal.2c04841
Electrocatalytic conversion of nitrate in waste can enable efficient waste remediation (NO3- to N2) or waste valorization (NO3- to NH4+) depending on the selectivity of the catalyst. Palladium and copper electrocatalysts typically exhibit ideal nitrate and nitrite binding properties, allowing for effective destruction of nitrate. However, rational steering of selectivity through material design remains a critical challenge for PdCu electrocatalyst. Here, we use the electrochemical underpotential deposition method to synthesize palladium nanocube electrocataysts with controlled copper surface coverage (e.g., partial and full copper coatings). We then examine the potential for NO3- destruction (conversion) and NO2- reduction reaction. We identify that partial copper-coated Pd nanocubes not only effectively facilitate the reduction of 95% of NO3- but also increase the reduction of NO2- to N2 with 89% selectivity over 20 consecutive cycles (80 h). We also show that under these conditions, the Pd(100) surface facet is exposed. Complete copper-covered Pd nanocubes effectively facilitate the reduction of ~99% of NO3-. Complete coverage of copper; however, prevented exposure of Pd(100) surface facet, promoting the selective reduction of NO2- to NH4+ with a 70% selectivity over 20 consecutive cycles (80 h). Density functional theory (DFT) calculations show that NO3- and NO2- adsorb more strongly on the Cu(100) surface compared to the Pd(100) surface, while the NO* intermediate generated from NO3- or NO2- reduction adsorbs more strongly on the Pd surface. Furthermore, barrier calculations show that NO* can readily migrate from the Cu domain to the Pd domain and that the N–N coupling barrier on Pd is significantly diminished at high NO* coverage. Together, these results suggest that the high N2 selectivity observed on the PdCu electrocatalyst is caused by the spillover of NO* from the Cu domains to the Pd domains.
Related Topics
- Type
- article
- Language
- en
- Landing Page
- https://doi.org/10.1021/acscatal.2c04841
- OA Status
- green
- Cited By
- 76
- References
- 73
- Related Works
- 10
- OpenAlex ID
- https://openalex.org/W4312131157
Raw OpenAlex JSON
- OpenAlex ID
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https://openalex.org/W4312131157Canonical identifier for this work in OpenAlex
- DOI
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https://doi.org/10.1021/acscatal.2c04841Digital Object Identifier
- Title
-
PdCu Electrocatalysts for Selective Nitrate and Nitrite Reduction to NitrogenWork title
- Type
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articleOpenAlex work type
- Language
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enPrimary language
- Publication year
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2022Year of publication
- Publication date
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2022-12-12Full publication date if available
- Authors
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Jeonghoon Lim, Yu Chen, David A. Cullen, Seung Woo Lee, Thomas P. Senftle, Marta C. HatzellList of authors in order
- Landing page
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https://doi.org/10.1021/acscatal.2c04841Publisher landing page
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YesWhether a free full text is available
- OA status
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greenOpen access status per OpenAlex
- OA URL
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https://www.osti.gov/biblio/1997736Direct OA link when available
- Concepts
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Electrocatalyst, Selectivity, Copper, Catalysis, Underpotential deposition, Inorganic chemistry, Palladium, Nitrate, Nitrite, Chemistry, Electrochemistry, Adsorption, Materials science, Cyclic voltammetry, Electrode, Physical chemistry, Organic chemistryTop concepts (fields/topics) attached by OpenAlex
- Cited by
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76Total citation count in OpenAlex
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2025: 34, 2024: 28, 2023: 14Per-year citation counts (last 5 years)
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73Number of works referenced by this work
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-
10Other works algorithmically related by OpenAlex
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