Directly growing hierarchical nickel-copper hydroxide nanowires on carbon fibre cloth for efficient electrooxidation of ammonia

Wei Xu, Rong Lan, Dongwei Du, John Humphreys, Marc Walker, Zucheng Wu, Huanting Wang, Shanwen Tao

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    Ammonia is an attractive carbon-free chemical for electrochemical energy conversion and storage. However, the sluggish kinetic rates of the ammonia electrooxidation reaction, and high cost and poisoning of Pt-based catalysts still remain challenges. This also limits the development of direct ammonia fuel cells. In this work, we directly grew hierarchical mixed NiCu layered hydroxides (LHs) nanowires on carbon fibre cloth electrodes by a facile one-step hydrothermal synthesis method for efficient electro-oxidation of ammonia. This catalyst achieves a current density of 35 mA cm−2 at 0.55 V vs. Ag/AgCl, which is much higher than that of bare Ni(OH)2 catalyst (5 mA cm−2). This is due to abundant active sites and a synergistic effect between Ni and Cu, possibly due to the formation of Ni1−xCuxOOH on the surface of the catalysts through the electrochemical activation of the mixture of Cu(OH)2 and α-Ni(OH)2. In the investigated first row transition elements, it is found that Cu is the sole first-row transition metal to effectively improve activity of Ni(OH)2 for ammonia electrooxidation. This mixed NiCu LHs nano-wire catalyst outperforms commercial Pt/C catalyst in the aspects of ammonia oxidation current and stability, demonstrating it to be a promising low-cost and stable catalyst for efficient ammonia electrooxidation in alkaline condition, which is a potential electrode for ammonia fuel cells for power generation or electrolysis of ammonia for ammonia-containing wastewater treatment.
    Original languageEnglish
    Pages (from-to)470-479
    Number of pages10
    JournalApplied Catalysis B: Environmental
    Early online date4 Jul 2017
    Publication statusPublished - 5 Dec 2017

    Bibliographical note

    This is an open access article under the CC BY license (


    • Hierarchical
    • Layered hydroxide
    • Electrocatalyst
    • Nano-wire
    • Ammonia oxidation


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