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Directly growing hierarchical nickel-copper hydroxide nanowires on carbon fibre cloth for efficient electrooxidation of ammonia
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Xu, Weijun, Lan, Rong, Du, Dongwei, Humphreys, John, Walker, Marc, Wu, Zucheng, Wang, Huanting and Tao, Shanwen (2017) Directly growing hierarchical nickel-copper hydroxide nanowires on carbon fibre cloth for efficient electrooxidation of ammonia. Applied Catalysis B: Environmental, 218 . pp. 470-479. doi:10.1016/j.apcatb.2017.07.005 ISSN 0926-3373.
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WRAP-directly-hierarchical-nickel-copper-nanowires-electrooxidation-Xu-2017.pdf - Published Version - Requires a PDF viewer. Available under License Creative Commons Attribution 4.0. Download (3500Kb) | Preview |
Official URL: http://dx.doi.org/10.1016/j.apcatb.2017.07.005
Abstract
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.
Item Type: | Journal Article | ||||||
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Subjects: | T Technology > TD Environmental technology. Sanitary engineering T Technology > TK Electrical engineering. Electronics Nuclear engineering |
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Divisions: | Faculty of Science, Engineering and Medicine > Engineering > Engineering Faculty of Science, Engineering and Medicine > Science > Physics |
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Library of Congress Subject Headings (LCSH): | Ammonia -- Oxidation, Nanowires, Electrochemistry, Catalysis | ||||||
Journal or Publication Title: | Applied Catalysis B: Environmental | ||||||
Publisher: | Elsevier BV | ||||||
ISSN: | 0926-3373 | ||||||
Official Date: | 4 July 2017 | ||||||
Dates: |
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Volume: | 218 | ||||||
Page Range: | pp. 470-479 | ||||||
DOI: | 10.1016/j.apcatb.2017.07.005 | ||||||
Status: | Peer Reviewed | ||||||
Publication Status: | Published | ||||||
Access rights to Published version: | Open Access (Creative Commons) | ||||||
Date of first compliant deposit: | 11 July 2017 | ||||||
Date of first compliant Open Access: | 11 July 2017 | ||||||
Funder: | Engineering and Physical Sciences Research Council (EPSRC), China Scholarship Council (CSC) | ||||||
Grant number: | EP/G01244X/1 (EPSRC) |
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