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Effects of composition on structure and activity of PtRu/C catalysts

Effects of composition on structure and activity of PtRu/C catalysts
Effects of composition on structure and activity of PtRu/C catalysts
A series of carbon supported PtRu bimetallic catalysts with varying Pt:Ru ratio were prepared and characterised using ex situ and in situ XRD, in situ EXAFS at 0 V vs. RHE, ex situ XPS and monolayer CO stripping voltammetry. Although the catalysts were found to be well mixed/alloyed, with no evidence of unalloyed Ru (oxides) present, the surfaces of the electrocatalyst nanoparticles were found to be enriched with Pt compared to the nominal bulk composition. The methanol oxidation activities of the catalysts were determined in 1.0 mol dm-3 H2SO4. In agreement with published studies of polycrystalline bulk PtRu alloys the catalyst with a 0.6 surface fraction of Pt was found to give the best methanol oxidation activity at 30 °C. However, at 80 °C a greater surface fraction of Ru could be tolerated, with some activity at low current densities found for a Pt surface fraction as low as 0.2. The results support the conclusion that a limited amount of methanol dehydrogenation occurs at Ru sites or Ru dominated surface ensembles at 80 °C.
1463-9076
2305-2313
Wiltshire, Richard
6aded250-32f6-4728-b6fd-7acc0d71c4e9
King, Colin R.
8b1a4ebd-8e96-4ef8-8bcc-5bb25b01e634
Rose, Abigail
7e1f0e36-2ad5-4e29-b9b9-756484f1f8c6
Wells, Peter P.
bc4fdc2d-a490-41bf-86cc-400edecf2266
Davies, Hazel
bcfa6164-31f8-4d9d-8878-127ad5d80619
Hogarth, Martin P.
e90dc448-c813-4e99-82b9-e35308a5a1e7
Thompsett, David
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Theobald, Brian
25a92794-161c-4f86-9468-2e59329f0a2f
Mosselmans, Fredrick W.
1878143f-55fa-4514-915b-3637afc58782
Roberts, Mark R.
2a5354ee-278e-4524-95b9-0ac0307735a2
Russell, Andrea E.
b6b7c748-efc1-4d5d-8a7a-8e4b69396169
Wiltshire, Richard
6aded250-32f6-4728-b6fd-7acc0d71c4e9
King, Colin R.
8b1a4ebd-8e96-4ef8-8bcc-5bb25b01e634
Rose, Abigail
7e1f0e36-2ad5-4e29-b9b9-756484f1f8c6
Wells, Peter P.
bc4fdc2d-a490-41bf-86cc-400edecf2266
Davies, Hazel
bcfa6164-31f8-4d9d-8878-127ad5d80619
Hogarth, Martin P.
e90dc448-c813-4e99-82b9-e35308a5a1e7
Thompsett, David
2fba717f-67ed-4999-b400-3c3a0681778f
Theobald, Brian
25a92794-161c-4f86-9468-2e59329f0a2f
Mosselmans, Fredrick W.
1878143f-55fa-4514-915b-3637afc58782
Roberts, Mark R.
2a5354ee-278e-4524-95b9-0ac0307735a2
Russell, Andrea E.
b6b7c748-efc1-4d5d-8a7a-8e4b69396169

Wiltshire, Richard, King, Colin R., Rose, Abigail, Wells, Peter P., Davies, Hazel, Hogarth, Martin P., Thompsett, David, Theobald, Brian, Mosselmans, Fredrick W., Roberts, Mark R. and Russell, Andrea E. (2009) Effects of composition on structure and activity of PtRu/C catalysts. Physical Chemistry Chemical Physics, 11, 2305-2313. (doi:10.1039/b819418a).

Record type: Article

Abstract

A series of carbon supported PtRu bimetallic catalysts with varying Pt:Ru ratio were prepared and characterised using ex situ and in situ XRD, in situ EXAFS at 0 V vs. RHE, ex situ XPS and monolayer CO stripping voltammetry. Although the catalysts were found to be well mixed/alloyed, with no evidence of unalloyed Ru (oxides) present, the surfaces of the electrocatalyst nanoparticles were found to be enriched with Pt compared to the nominal bulk composition. The methanol oxidation activities of the catalysts were determined in 1.0 mol dm-3 H2SO4. In agreement with published studies of polycrystalline bulk PtRu alloys the catalyst with a 0.6 surface fraction of Pt was found to give the best methanol oxidation activity at 30 °C. However, at 80 °C a greater surface fraction of Ru could be tolerated, with some activity at low current densities found for a Pt surface fraction as low as 0.2. The results support the conclusion that a limited amount of methanol dehydrogenation occurs at Ru sites or Ru dominated surface ensembles at 80 °C.

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Published date: 2009
Organisations: Chemistry

Identifiers

Local EPrints ID: 146389
URI: http://eprints.soton.ac.uk/id/eprint/146389
ISSN: 1463-9076
PURE UUID: 8c6929ed-0533-43f4-a844-2b343d69ed8c
ORCID for Peter P. Wells: ORCID iD orcid.org/0000-0002-0859-9172
ORCID for Andrea E. Russell: ORCID iD orcid.org/0000-0002-8382-6443

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Date deposited: 22 Apr 2010 10:56
Last modified: 20 Jul 2019 01:13

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Contributors

Author: Richard Wiltshire
Author: Colin R. King
Author: Abigail Rose
Author: Peter P. Wells ORCID iD
Author: Hazel Davies
Author: Martin P. Hogarth
Author: David Thompsett
Author: Brian Theobald
Author: Fredrick W. Mosselmans
Author: Mark R. Roberts

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