Role of Cu and Ni in dual sites layered electrocatalysts for ammonia electrooxidation

IF 4.7 2区化学 Q2 CHEMISTRY, PHYSICAL

Applied Catalysis A: General Pub Date : 2025-02-20 DOI:10.1016/j.apcata.2025.120181

Sara Sumbal, Justyna Łuczak, Afaq Hassan, Marek Lieder

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引用次数: 0

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 NH_x molecules bound to nickel sites (dual-sites mechanism).

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来源期刊

Applied Catalysis A: General 化学-环境科学

CiteScore

9.00

自引率

5.50%

发文量

415

审稿时长

24 days

期刊介绍： Applied Catalysis A: General publishes original papers on all aspects of catalysis of basic and practical interest to chemical scientists in both industrial and academic fields, with an emphasis onnew understanding of catalysts and catalytic reactions, new catalytic materials, new techniques, and new processes, especially those that have potential practical implications. Papers that report results of a thorough study or optimization of systems or processes that are well understood, widely studied, or minor variations of known ones are discouraged. Authors should include statements in a separate section "Justification for Publication" of how the manuscript fits the scope of the journal in the cover letter to the editors. Submissions without such justification will be rejected without review.