Oxygen reduction reaction on cobalt–nickel alloys prepared by mechanical alloying

Mechanical alloying technique was used to prepare several Co–Ni alloys in a high-energy SPEX 8000 mill. The initial ratios of elemental Co–Ni powders were 30:70, 40:60, 50:50, 60:40 and 70:30 wt.%. Elemental cobalt and nickel powders were milled separately during 20 h as a reference. XRD results ind...

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Bibliographic Details
Published inJournal of alloys and compounds Vol. 434; pp. 522 - 524
Main Authors García-Contreras, M.A., Fernández-Valverde, S.M., Vargas-García, J.R.
Format Journal Article
LanguageEnglish
Published Elsevier B.V 31.05.2007
Subjects
Electrochemical reactions
Mechanical alloying
Nanostructured materials
X-ray diffraction
X-ray diffraction
Electrochemical reactions
Nanostructured materials
Mechanical alloying
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Summary:Mechanical alloying technique was used to prepare several Co–Ni alloys in a high-energy SPEX 8000 mill. The initial ratios of elemental Co–Ni powders were 30:70, 40:60, 50:50, 60:40 and 70:30 wt.%. Elemental cobalt and nickel powders were milled separately during 20 h as a reference. XRD results indicated that crystalline solid solutions were achieved after 5 h of milling. TEM observations revealed that mechanical alloys consist of agglomerated fine particles of about 10 nm in size. Electrochemical measurements showed that the Co–Ni 30:70 wt.%, in particular, exhibited the highest current density for the oxygen reduction reaction (ORR) via four electrons.
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ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2006.08.147