TY - JOUR
T1 - Electrochemical and XAS investigation of oxygen reduction reaction on Pt-TiO2-C catalysts
AU - Ruiz-Camacho, B.
AU - Valenzuela, M. A.
AU - González-Huerta, R. G.
AU - Suarez-Alcantara, K.
AU - Canton, S. E.
AU - Pola-Albores, F.
N1 - Funding Information:
The authors are grateful to the ESIQIE-IPN, CIMAV-Nanotech Chihuahua, University of Poitiers and MAX-Lab institutions. Multidisciplinary project SIP-1338, project ICYTDF PIEMP 11/31, project PROMEP 103.5/12/3400 and project CONACyT 153356. Authors acknowledge the advice of Dr. Stefan Carlson, Dr. Katarina Norén and Dr. Tomás Plivelic during synchrotron data collecting at MAX-lab. KSA and SEC were supported by the Swedish Research Council and the Crafoord Foundation .
PY - 2013
Y1 - 2013
N2 - Pt-TiO2-C composites with different titanium oxide loading were synthesized by photo-deposition and chemical vapor deposition methods. The changes in their electronic properties improve the electrochemical activity toward the oxygen reduction reaction (ORR) compared to the Pt-C catalyst synthesized at the same conditions. The platinum samples were physically characterized by means of Transmission Electron Microscopy (TEM), Small Angle X-ray Scattering (SAXS), X-ray Absorption Spectroscopy (XAS) and X-ray Photo-electron Spectroscopy (XPS). Their electrochemical activity was also investigated by cyclic and linear voltammetry techniques. TEM analysis shows homogeneously dispersed platinum nanoparticles with an average particle size of 2 nm in all the synthesized samples. Form factor (morphology model) and particle size were determined by SAXS, the data adjusted to spherical Pt nanoparticles in both synthesis methods. XAS studies at the Pt L3-edge shows a close interaction of Pt with the support material, i.e. C or TiO2. XPS analysis reveals surface modifications that induce electronic changes on Pt-TiO2-C. Significant differences in the ORR electrochemical activity were correlated to the TiO2 loading and the synthesis procedure.
AB - Pt-TiO2-C composites with different titanium oxide loading were synthesized by photo-deposition and chemical vapor deposition methods. The changes in their electronic properties improve the electrochemical activity toward the oxygen reduction reaction (ORR) compared to the Pt-C catalyst synthesized at the same conditions. The platinum samples were physically characterized by means of Transmission Electron Microscopy (TEM), Small Angle X-ray Scattering (SAXS), X-ray Absorption Spectroscopy (XAS) and X-ray Photo-electron Spectroscopy (XPS). Their electrochemical activity was also investigated by cyclic and linear voltammetry techniques. TEM analysis shows homogeneously dispersed platinum nanoparticles with an average particle size of 2 nm in all the synthesized samples. Form factor (morphology model) and particle size were determined by SAXS, the data adjusted to spherical Pt nanoparticles in both synthesis methods. XAS studies at the Pt L3-edge shows a close interaction of Pt with the support material, i.e. C or TiO2. XPS analysis reveals surface modifications that induce electronic changes on Pt-TiO2-C. Significant differences in the ORR electrochemical activity were correlated to the TiO2 loading and the synthesis procedure.
KW - Oxygen reduction
KW - Platinum
KW - Synchrotron radiation
KW - Titanium oxide
KW - XAS
KW - XPS
UR - http://www.scopus.com/inward/record.url?scp=84883795098&partnerID=8YFLogxK
U2 - 10.1016/j.ijhydene.2013.01.002
DO - 10.1016/j.ijhydene.2013.01.002
M3 - Artículo
AN - SCOPUS:84883795098
SN - 0360-3199
VL - 38
SP - 12648
EP - 12656
JO - International Journal of Hydrogen Energy
JF - International Journal of Hydrogen Energy
IS - 28
ER -
