Methanol Electrooxidation on Nickel Nanoparticles Decorating Graphite Flakes Surface
Tipo
Artigo
Data de publicação
2020
Periódico
Electrocatalysis
Citações (Scopus)
5
Autores
Garcia-Basabe Y.
De Souza Dos Reis R.G.C.
da Cunha R.O.R.R.
Larrude D.G.
Sossmeier K.D.
Salgado J.R.C.
De Souza Dos Reis R.G.C.
da Cunha R.O.R.R.
Larrude D.G.
Sossmeier K.D.
Salgado J.R.C.
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Resumo
© 2019, Springer Science+Business Media, LLC, part of Springer Nature.In the present work, a simple approach was proposed to produce nanocomposites of nickel nanoparticles decorating graphite flake surface (Ni-NP/graphite) from a ball milling method for methanol electrooxidation reaction. Nickel nanoparticles (Ni-NPs) were obtained after milling for 40 h at 400 rpm. The nanocomposites were prepared blending Ni-NPs and graphite flakes and milling at different ball rotation speeds (100, 200, 300, and 400 rpm). Good agreement between scanning transmission electron microscopy and X-ray diffraction results was found, reporting average particle diameter size of 4.9 nm and average crystallite size of 5.5 nm for Ni-NPs. The methanol electrocatalytic activity and stability of Ni-NPs/graphite nanocomposites were evaluated using cyclic voltammetry and chronoamperometry techniques. The possible methanol electrooxidation mechanism in Ni-NP/graphite nanocomposites was established from deconvolution of the anodic parts of voltammetric curves. The more efficient electrocatalytic activity and stability was found for Ni-NPs/graphite nanocomposite prepared using lower rotation speed (100 rpm). This behavior is associated to the loss of graphite crystallinity and consequently decreasing of its electronic conductivity with the increase of the ball milling energy which is directly related to the rotation speed during decoration procedure. [Figure not available: see fulltext.].