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Abstract
Single metal layered α-Ni(OH)2, β-Ni(OH)2 or dual metal layered NiCu hydroxides were hydrothermally deposited on nickel foam (NF) and investigated for electrochemical oxidation of ammonia. Copper induced conversion of hydrotalcite (α-Ni(OH)2) phase into the mixed hydrotalcite/brucite (α/β-NiCu) structure, which is distinguished by smaller stacks and larger interplanar distances, demonstrated the highest catalytic performance. Copper inclusion resulted in two-fold increase in the current density (to 55.2 mA/cm2 at 1.55 V vs RHE for α/β-NiCu(1/1)) as well as significant increase in the electrochemical active surface area (387.5 cm2) and turnover frequency (0.56 1/cm2). The presence of Cu does not affect the onset potential of the reaction but elevated the overpotential of water oxidation, thereby increasing N2 selectivity. We proposed formation of temporary vacancies on the copper sites during AOR, which allowed the adsorption of OH followed by their coupling with hydrogen atoms derived from NHx molecules bound to nickel sites (dual-sites mechanism).
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- Category:
- Articles
- Type:
- artykuły w czasopismach
- Published in:
-
APPLIED CATALYSIS A-GENERAL
no. 696,
ISSN: 0926-860X - Language:
- English
- Publication year:
- 2025
- Bibliographic description:
- Sumbal S., Łuczak J., Hassan A., Lieder M.: Role of Cu and Ni in dual sites layered electrocatalysts for ammonia electrooxidation// APPLIED CATALYSIS A-GENERAL -Vol. 696, (2025), s.120181-
- DOI:
- Digital Object Identifier (open in new tab) 10.1016/j.apcata.2025.120181
- Sources of funding:
-
- Free publication
- Verified by:
- Gdańsk University of Technology
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