Cu–Ni materials prepared by mechanical milling: Their properties and electrocatalytic activity towards nitrate reduction in alkaline medium

Autor:	Laurence Durivault, Oleg Brylev, Daniel Bélanger, David Reyter, Mathieu Sarrazin, Lionel Roué
Rok vydání:	2007
Předmět:	Electrolysis Materials science Mechanical Engineering Inorganic chemistry Metals and Alloys Electrochemistry Nanocrystalline material law.invention Ammonia chemistry.chemical_compound chemistry Nitrate Mechanics of Materials law Materials Chemistry Crystallite Nitrite Ball mill
Zdroj:	Journal of Alloys and Compounds. 432:323-332
ISSN:	0925-8388
Popis:	Cu x Ni 1− x materials (0 ≤ x ≤ 100) were elaborated by high-energy ball milling. The milling conditions were optimized using the composition Ni 80 Cu 20 . Utilizing a ball-to-powder mass ratio of 2 and a milling time of 6 h, one can obtain nanocrystalline Ni 80 Cu 20 alloys (crystallite size 95%) and with a very low Fe contamination ( x Ni 1− x alloys prepared under optimized milling conditions were used as electrode materials for the electrochemical reduction of nitrate and nitrite in alkaline medium. The analyses of the products formed during the nitrate electrolysis revealed the formation of only ammonia and nitrite ions. The increase in Ni content in the materials resulted in increasing the selectivity for ammonia formation. On the other hand, the nitrate destruction rate increased as the Cu content in the materials was raised, attaining 9.8 × 10 −4 mol cm −2 h −1 for pure Cu. This confirms the higher electrocatalytic activity of Cu with respect to Ni for nitrate reduction in alkaline solutions.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::37a2670d2cf0316906062ae28e3df707 https://doi.org/10.1016/j.jallcom.2006.06.023 Zobrazit plný text záznamu Full Text from ScienceDirect