Pt(Ni) electrocatalysts for methanol oxidation prepared by galvanic replacement on TiO2 and TiO2-C powder supports

J. Georgieva, E. Valova, I. Mintsouli, S. Sotiropoulos, D. Tatchev, S. Armyanov, A. Hubin, J. Dille, A. Hoell, V. Raghuwanshi, N. Karanasios, L. Malet

Research output: Contribution to journalArticleResearchpeer-review

Abstract

Pt(Ni) catalysts were prepared by electroless deposition of Ni on TiO2 and mixed TiO2-C powder supports, followed by partial galvanic replacement of Ni by Pt in a chloroplatinate solution. Pt(Ni)/TiO2 and Pt(Ni)/TiO2-C catalysts were characterized by transmission electron microscopy (TEM), energy-dispersive spectrometry (EDS), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and anomalous small-angle X-ray scattering (ASAXS). XPS and ASAXS results showed no detectable alloying between Pt and Ni. In accordance with ASAXS analysis, the size of the Pt particles of the two samples is practically similar (2.1 and 1.5 nm). The electrocatalytic activity of the catalysts towards methanol oxidation and poisonous CO removal was assessed by cyclic voltammetry and chronoamperometry experiments and compared to commercial Pt/C catalysts. Despite the fact that the specific mass activity of the prepared catalysts is lower than that of the commercial material (as a result of their smaller surface area), both Pt(Ni)/TiO2 and Pt(Ni)/TiO2-C electrodes showed superior intrinsic catalytic activity (per Pt electroactive area) than the Pt/C catalyst. This is attributed to a synergistic effect of TiO2 on facile CO poison removal from Pt sites.

Original languageEnglish
Pages (from-to)65-74
Number of pages10
JournalJournal of Electroanalytical Chemistry
Volume754
DOIs
Publication statusPublished - 13 Jul 2015
Externally publishedYes

Keywords

  • Electrocatalysis
  • Galvanic replacement
  • Methanol oxidation
  • Platinum
  • Titanium oxide

Cite this

Georgieva, J. ; Valova, E. ; Mintsouli, I. ; Sotiropoulos, S. ; Tatchev, D. ; Armyanov, S. ; Hubin, A. ; Dille, J. ; Hoell, A. ; Raghuwanshi, V. ; Karanasios, N. ; Malet, L. / Pt(Ni) electrocatalysts for methanol oxidation prepared by galvanic replacement on TiO2 and TiO2-C powder supports. In: Journal of Electroanalytical Chemistry. 2015 ; Vol. 754. pp. 65-74.
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title = "Pt(Ni) electrocatalysts for methanol oxidation prepared by galvanic replacement on TiO2 and TiO2-C powder supports",
abstract = "Pt(Ni) catalysts were prepared by electroless deposition of Ni on TiO2 and mixed TiO2-C powder supports, followed by partial galvanic replacement of Ni by Pt in a chloroplatinate solution. Pt(Ni)/TiO2 and Pt(Ni)/TiO2-C catalysts were characterized by transmission electron microscopy (TEM), energy-dispersive spectrometry (EDS), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and anomalous small-angle X-ray scattering (ASAXS). XPS and ASAXS results showed no detectable alloying between Pt and Ni. In accordance with ASAXS analysis, the size of the Pt particles of the two samples is practically similar (2.1 and 1.5 nm). The electrocatalytic activity of the catalysts towards methanol oxidation and poisonous CO removal was assessed by cyclic voltammetry and chronoamperometry experiments and compared to commercial Pt/C catalysts. Despite the fact that the specific mass activity of the prepared catalysts is lower than that of the commercial material (as a result of their smaller surface area), both Pt(Ni)/TiO2 and Pt(Ni)/TiO2-C electrodes showed superior intrinsic catalytic activity (per Pt electroactive area) than the Pt/C catalyst. This is attributed to a synergistic effect of TiO2 on facile CO poison removal from Pt sites.",
keywords = "Electrocatalysis, Galvanic replacement, Methanol oxidation, Platinum, Titanium oxide",
author = "J. Georgieva and E. Valova and I. Mintsouli and S. Sotiropoulos and D. Tatchev and S. Armyanov and A. Hubin and J. Dille and A. Hoell and V. Raghuwanshi and N. Karanasios and L. Malet",
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Georgieva, J, Valova, E, Mintsouli, I, Sotiropoulos, S, Tatchev, D, Armyanov, S, Hubin, A, Dille, J, Hoell, A, Raghuwanshi, V, Karanasios, N & Malet, L 2015, 'Pt(Ni) electrocatalysts for methanol oxidation prepared by galvanic replacement on TiO2 and TiO2-C powder supports' Journal of Electroanalytical Chemistry, vol. 754, pp. 65-74. https://doi.org/10.1016/j.jelechem.2015.07.001

Pt(Ni) electrocatalysts for methanol oxidation prepared by galvanic replacement on TiO2 and TiO2-C powder supports. / Georgieva, J.; Valova, E.; Mintsouli, I.; Sotiropoulos, S.; Tatchev, D.; Armyanov, S.; Hubin, A.; Dille, J.; Hoell, A.; Raghuwanshi, V.; Karanasios, N.; Malet, L.

In: Journal of Electroanalytical Chemistry, Vol. 754, 13.07.2015, p. 65-74.

Research output: Contribution to journalArticleResearchpeer-review

TY - JOUR

T1 - Pt(Ni) electrocatalysts for methanol oxidation prepared by galvanic replacement on TiO2 and TiO2-C powder supports

AU - Georgieva, J.

AU - Valova, E.

AU - Mintsouli, I.

AU - Sotiropoulos, S.

AU - Tatchev, D.

AU - Armyanov, S.

AU - Hubin, A.

AU - Dille, J.

AU - Hoell, A.

AU - Raghuwanshi, V.

AU - Karanasios, N.

AU - Malet, L.

PY - 2015/7/13

Y1 - 2015/7/13

N2 - Pt(Ni) catalysts were prepared by electroless deposition of Ni on TiO2 and mixed TiO2-C powder supports, followed by partial galvanic replacement of Ni by Pt in a chloroplatinate solution. Pt(Ni)/TiO2 and Pt(Ni)/TiO2-C catalysts were characterized by transmission electron microscopy (TEM), energy-dispersive spectrometry (EDS), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and anomalous small-angle X-ray scattering (ASAXS). XPS and ASAXS results showed no detectable alloying between Pt and Ni. In accordance with ASAXS analysis, the size of the Pt particles of the two samples is practically similar (2.1 and 1.5 nm). The electrocatalytic activity of the catalysts towards methanol oxidation and poisonous CO removal was assessed by cyclic voltammetry and chronoamperometry experiments and compared to commercial Pt/C catalysts. Despite the fact that the specific mass activity of the prepared catalysts is lower than that of the commercial material (as a result of their smaller surface area), both Pt(Ni)/TiO2 and Pt(Ni)/TiO2-C electrodes showed superior intrinsic catalytic activity (per Pt electroactive area) than the Pt/C catalyst. This is attributed to a synergistic effect of TiO2 on facile CO poison removal from Pt sites.

AB - Pt(Ni) catalysts were prepared by electroless deposition of Ni on TiO2 and mixed TiO2-C powder supports, followed by partial galvanic replacement of Ni by Pt in a chloroplatinate solution. Pt(Ni)/TiO2 and Pt(Ni)/TiO2-C catalysts were characterized by transmission electron microscopy (TEM), energy-dispersive spectrometry (EDS), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and anomalous small-angle X-ray scattering (ASAXS). XPS and ASAXS results showed no detectable alloying between Pt and Ni. In accordance with ASAXS analysis, the size of the Pt particles of the two samples is practically similar (2.1 and 1.5 nm). The electrocatalytic activity of the catalysts towards methanol oxidation and poisonous CO removal was assessed by cyclic voltammetry and chronoamperometry experiments and compared to commercial Pt/C catalysts. Despite the fact that the specific mass activity of the prepared catalysts is lower than that of the commercial material (as a result of their smaller surface area), both Pt(Ni)/TiO2 and Pt(Ni)/TiO2-C electrodes showed superior intrinsic catalytic activity (per Pt electroactive area) than the Pt/C catalyst. This is attributed to a synergistic effect of TiO2 on facile CO poison removal from Pt sites.

KW - Electrocatalysis

KW - Galvanic replacement

KW - Methanol oxidation

KW - Platinum

KW - Titanium oxide

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