Structural disordering of de-alloyed Pt bimetallic nanocatalysts: the effect on oxygen reduction reaction activity and stability
Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
Standard
Structural disordering of de-alloyed Pt bimetallic nanocatalysts : the effect on oxygen reduction reaction activity and stability. / Spanos, Ioannis; Dideriksen, Knud; Kirkensgaard, Jacob Judas Kain; Jelavic, Stanislav; Arenz, Matthias.
I: Physical chemistry chemical physics : PCCP, Bind 17, Nr. 42, 2015, s. 28044-28053.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
Harvard
APA
Vancouver
Author
Bibtex
}
RIS
TY - JOUR
T1 - Structural disordering of de-alloyed Pt bimetallic nanocatalysts
T2 - the effect on oxygen reduction reaction activity and stability
AU - Spanos, Ioannis
AU - Dideriksen, Knud
AU - Kirkensgaard, Jacob Judas Kain
AU - Jelavic, Stanislav
AU - Arenz, Matthias
PY - 2015
Y1 - 2015
N2 - Platinum bimetallic alloys are well-known for their ability to catalyze the oxygen reduction reaction (ORR) in proton exchange membrane fuel cells (PEMFCs). PtxCo1-x colloidal nanoparticles were synthesized with varying initial Pt : Co ratios, but constant size to investigate how the initial metal composition affects their electrocatalytic performance. The results show that upon contact with acid environment the Co leaches out of the particles leading to almost identical compositions, independent of the initial differences. Surprisingly the data show a clear trend in ORR activity, although the PtxCo1-x nanoparticles almost completely de-alloy during acid leaching, i.e. under reaction conditions in a fuel cell. To scrutinize the resulting particle structure after de-alloying we used pair distribution function (PDF) analysis and X-ray diffraction (XRD) gaining insight into the structural disorder and its dependence on the initial metal composition. Our results suggest that not only the ORR activity, but also the corrosion resistance of the synthesized NPs, are dependent on the structural disorder resulting from the de-alloying process.
AB - Platinum bimetallic alloys are well-known for their ability to catalyze the oxygen reduction reaction (ORR) in proton exchange membrane fuel cells (PEMFCs). PtxCo1-x colloidal nanoparticles were synthesized with varying initial Pt : Co ratios, but constant size to investigate how the initial metal composition affects their electrocatalytic performance. The results show that upon contact with acid environment the Co leaches out of the particles leading to almost identical compositions, independent of the initial differences. Surprisingly the data show a clear trend in ORR activity, although the PtxCo1-x nanoparticles almost completely de-alloy during acid leaching, i.e. under reaction conditions in a fuel cell. To scrutinize the resulting particle structure after de-alloying we used pair distribution function (PDF) analysis and X-ray diffraction (XRD) gaining insight into the structural disorder and its dependence on the initial metal composition. Our results suggest that not only the ORR activity, but also the corrosion resistance of the synthesized NPs, are dependent on the structural disorder resulting from the de-alloying process.
U2 - 10.1039/c4cp04264f
DO - 10.1039/c4cp04264f
M3 - Journal article
C2 - 25537262
VL - 17
SP - 28044
EP - 28053
JO - Physical Chemistry Chemical Physics
JF - Physical Chemistry Chemical Physics
SN - 1463-9076
IS - 42
ER -
ID: 131610134