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Preparation, structure, and stability of Pt and Pd monolayer modified Pd and Pt electrocatalysts

Preparation, structure, and stability of Pt and Pd monolayer modified Pd and Pt electrocatalysts
Preparation, structure, and stability of Pt and Pd monolayer modified Pd and Pt electrocatalysts
A controlled surface reaction technique has been successfully employed to prepare a series of Pt modified Pd/C (Pt/Pd/C) and Pd modified Pt/C (Pd/Pt/C) catalysts. The resulting catalyst materials were characterised by TEM, XRD, electrochemistry, and EXAFS techniques. In the case of the Pd/Pt/C carbon catalysts, core–shell structural arrangements were found, with a 0.04 Å contraction of the Pd–Pd bond distance for the 1 Pd/Pt/C being observed. A greater degree of alloying was found for the Pt/Pd/C catalysts where the surface had a mixed composition with a large proportion of the Pt in the interior of the nanoparticle. However, strong Pt characteristics were exhibited in the voltammetry of Pt/Pd/C catalysts, most notably a large increase in the stability with respect to the electrochemical environment compared to Pd alone.


surface organometallic chemistry, palladium alloy electrocatalysts, oxygen reduction reaction, o-2 reduction, catalysts, pt(111), metals, nanoparticles, deposition, oxidation
1463-9076
5773-5781
Wells, P.P.
bc4fdc2d-a490-41bf-86cc-400edecf2266
Crabb, E.M.
d8c4339f-b3e4-440b-971e-0976b65b0d6c
King, C.R.
23a71701-9d65-492b-913a-bf8174d3bfa3
Wiltshire, R.
6abdee52-e1ef-40be-91d3-bbee143ccc0c
Billsborrow, B.
b76480b0-91b9-4694-8b31-f6faf8496793
Thompsett, D.
6f7014d2-14b6-401e-9da9-7916d48a21dd
Russell, A.E.
b6b7c748-efc1-4d5d-8a7a-8e4b69396169
Wells, P.P.
bc4fdc2d-a490-41bf-86cc-400edecf2266
Crabb, E.M.
d8c4339f-b3e4-440b-971e-0976b65b0d6c
King, C.R.
23a71701-9d65-492b-913a-bf8174d3bfa3
Wiltshire, R.
6abdee52-e1ef-40be-91d3-bbee143ccc0c
Billsborrow, B.
b76480b0-91b9-4694-8b31-f6faf8496793
Thompsett, D.
6f7014d2-14b6-401e-9da9-7916d48a21dd
Russell, A.E.
b6b7c748-efc1-4d5d-8a7a-8e4b69396169

Wells, P.P., Crabb, E.M., King, C.R., Wiltshire, R., Billsborrow, B., Thompsett, D. and Russell, A.E. (2009) Preparation, structure, and stability of Pt and Pd monolayer modified Pd and Pt electrocatalysts. Physical Chemistry Chemical Physics, 11 (27), 5773-5781. (doi:10.1039/b823504j).

Record type: Article

Abstract

A controlled surface reaction technique has been successfully employed to prepare a series of Pt modified Pd/C (Pt/Pd/C) and Pd modified Pt/C (Pd/Pt/C) catalysts. The resulting catalyst materials were characterised by TEM, XRD, electrochemistry, and EXAFS techniques. In the case of the Pd/Pt/C carbon catalysts, core–shell structural arrangements were found, with a 0.04 Å contraction of the Pd–Pd bond distance for the 1 Pd/Pt/C being observed. A greater degree of alloying was found for the Pt/Pd/C catalysts where the surface had a mixed composition with a large proportion of the Pt in the interior of the nanoparticle. However, strong Pt characteristics were exhibited in the voltammetry of Pt/Pd/C catalysts, most notably a large increase in the stability with respect to the electrochemical environment compared to Pd alone.


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More information

Published date: 2009
Keywords: surface organometallic chemistry, palladium alloy electrocatalysts, oxygen reduction reaction, o-2 reduction, catalysts, pt(111), metals, nanoparticles, deposition, oxidation
Organisations: Chemistry

Identifiers

Local EPrints ID: 146359
URI: http://eprints.soton.ac.uk/id/eprint/146359
ISSN: 1463-9076
PURE UUID: 52e2a0c6-2146-44ad-915c-eeeb5b518286
ORCID for P.P. Wells: ORCID iD orcid.org/0000-0002-0859-9172
ORCID for A.E. Russell: ORCID iD orcid.org/0000-0002-8382-6443

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Date deposited: 22 Apr 2010 10:32
Last modified: 12 Nov 2019 01:56

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Contributors

Author: P.P. Wells ORCID iD
Author: E.M. Crabb
Author: C.R. King
Author: R. Wiltshire
Author: B. Billsborrow
Author: D. Thompsett
Author: A.E. Russell ORCID iD

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