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Mechanically activated Pt-Ni and Pt-Co alloys as electrocatalysts in the oxygen reduction reaction

Cortes-Escobedo, Claudia A.; Gonzalez-Huerta, Rosa de G.; Bolarin-Miro, Ana M.; Sanchez de Jesus, Felix; Zhu, Q.; Canton, Sophie LU ; Suarez Alcantara, Karina LU and Tufino-Velazquez, M. (2014) In International Journal of Hydrogen Energy 39(29). p.16722-16730
Abstract
Mixtures of powders of platinum with nickel or cobalt to obtain Ni0.75Pt0.25 or Co0.75Pt0.25 were mechanical alloyed by high energy ball milling. The results of crystal structure, morphology and electrocatalytic performance are presented for mechanically activated powders after 3 and 9 h of ball milling. Total solid solutions of Ni and Co with platinum were analyzed by X-ray diffraction after 3 h of ball milling. After 9 h of ball milling, in both cases, the total solid solution was accompanied by the appearance of NiO or CoO and ZrO associated with a redox reaction with the milling media. The presence of zirconium monoxide was confirmed by energy dispersive spectroscopy analysis. In both cases, an amorphization was detected. X ray... (More)
Mixtures of powders of platinum with nickel or cobalt to obtain Ni0.75Pt0.25 or Co0.75Pt0.25 were mechanical alloyed by high energy ball milling. The results of crystal structure, morphology and electrocatalytic performance are presented for mechanically activated powders after 3 and 9 h of ball milling. Total solid solutions of Ni and Co with platinum were analyzed by X-ray diffraction after 3 h of ball milling. After 9 h of ball milling, in both cases, the total solid solution was accompanied by the appearance of NiO or CoO and ZrO associated with a redox reaction with the milling media. The presence of zirconium monoxide was confirmed by energy dispersive spectroscopy analysis. In both cases, an amorphization was detected. X ray absorption spectroscopy measurements showed changes in atomic and electronic environment of platinum, a reduction of the distance to the first coordination sphere and increased d-band vacancy vs pure Pt and Pt nanoparticles were observed for both studied systems. The electrocatalytic activity was determined using cyclic and linear voltammetry. The Co0.75Pt0.25 alloy milled for 9 h showed a higher electrochemical activity for the oxygen reduction reaction (ORR) compared with the other samples, including Pt-Etek. The degree of the ORR electrochemical activity was correlated with the presence of ZrO, which could affect the oxygen adsorption and improve the catalytic activity for the oxygen reduction reaction. Copyright (C) 2014, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
NiPt, CoPt, ORR, Electrocatalysts, Mechanical alloying, Anchor effect
in
International Journal of Hydrogen Energy
volume
39
issue
29
pages
16722 - 16730
publisher
Elsevier
external identifiers
  • wos:000343389700051
  • scopus:84908069033
ISSN
1879-3487
DOI
10.1016/j.ijhydene.2014.03.025
language
English
LU publication?
yes
id
80400295-ab60-4061-94bc-a57a635b17c4 (old id 4783705)
date added to LUP
2014-11-20 09:40:22
date last changed
2017-08-27 04:43:26
@article{80400295-ab60-4061-94bc-a57a635b17c4,
  abstract     = {Mixtures of powders of platinum with nickel or cobalt to obtain Ni0.75Pt0.25 or Co0.75Pt0.25 were mechanical alloyed by high energy ball milling. The results of crystal structure, morphology and electrocatalytic performance are presented for mechanically activated powders after 3 and 9 h of ball milling. Total solid solutions of Ni and Co with platinum were analyzed by X-ray diffraction after 3 h of ball milling. After 9 h of ball milling, in both cases, the total solid solution was accompanied by the appearance of NiO or CoO and ZrO associated with a redox reaction with the milling media. The presence of zirconium monoxide was confirmed by energy dispersive spectroscopy analysis. In both cases, an amorphization was detected. X ray absorption spectroscopy measurements showed changes in atomic and electronic environment of platinum, a reduction of the distance to the first coordination sphere and increased d-band vacancy vs pure Pt and Pt nanoparticles were observed for both studied systems. The electrocatalytic activity was determined using cyclic and linear voltammetry. The Co0.75Pt0.25 alloy milled for 9 h showed a higher electrochemical activity for the oxygen reduction reaction (ORR) compared with the other samples, including Pt-Etek. The degree of the ORR electrochemical activity was correlated with the presence of ZrO, which could affect the oxygen adsorption and improve the catalytic activity for the oxygen reduction reaction. Copyright (C) 2014, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.},
  author       = {Cortes-Escobedo, Claudia A. and Gonzalez-Huerta, Rosa de G. and Bolarin-Miro, Ana M. and Sanchez de Jesus, Felix and Zhu, Q. and Canton, Sophie and Suarez Alcantara, Karina and Tufino-Velazquez, M.},
  issn         = {1879-3487},
  keyword      = {NiPt,CoPt,ORR,Electrocatalysts,Mechanical alloying,Anchor effect},
  language     = {eng},
  number       = {29},
  pages        = {16722--16730},
  publisher    = {Elsevier},
  series       = {International Journal of Hydrogen Energy},
  title        = {Mechanically activated Pt-Ni and Pt-Co alloys as electrocatalysts in the oxygen reduction reaction},
  url          = {http://dx.doi.org/10.1016/j.ijhydene.2014.03.025},
  volume       = {39},
  year         = {2014},
}