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In situ x-ray absorption spectroscopy and x-ray diffraction of fuel cell electrocatalysts

In situ x-ray absorption spectroscopy and x-ray diffraction of fuel cell electrocatalysts
In situ x-ray absorption spectroscopy and x-ray diffraction of fuel cell electrocatalysts
The utility of in situ X-ray absorption spectroscopy (XAS) in determining structural parameters, through analysis of the extended X-ray absorption fine structure (EXAFS), and electronic perturbations, through a white line analysis of the X-ray absorption near edge structure (XANES), is demonstrated for Pt/C. PtRu/C and PtMo/C fuel cell electrodes. The results provide verification that the enhancement of CO tolerance of the alloy catalysts occurs via an intrinsic mechanism for the PtRu alloy, whilst a promotion mechanism is in operation for the PtMo alloy. Preliminary results of an in situ powder X-ray diffraction (XRD) method which utilises synchrotron radiation (SR) and a curved image plate detector are also presented, using Pd/C as an example. The lattice expansion upon formation of the P-hydride is clearly observed.
fuel cell catalysts, x-ray absorption spectroscopy, x-ray diffraction structure transformation, carbon, particles, state, xas
0378-7753
226-232
Russell, Andrea E.
b6b7c748-efc1-4d5d-8a7a-8e4b69396169
Maniguet, Stephanie
cd69841b-03b4-4c98-9ef7-141d56e67228
Mathew, Rebecca J.
99fc8051-9cd8-4bf6-9604-82f9a4d39602
Yao, Jun
cd8e4e0e-ed2d-4590-be1f-fc6340f6a441
Roberts, Mark A.
408bcc32-5064-4751-86df-4e799015bfe7
Thompsett, David
2fba717f-67ed-4999-b400-3c3a0681778f
Russell, Andrea E.
b6b7c748-efc1-4d5d-8a7a-8e4b69396169
Maniguet, Stephanie
cd69841b-03b4-4c98-9ef7-141d56e67228
Mathew, Rebecca J.
99fc8051-9cd8-4bf6-9604-82f9a4d39602
Yao, Jun
cd8e4e0e-ed2d-4590-be1f-fc6340f6a441
Roberts, Mark A.
408bcc32-5064-4751-86df-4e799015bfe7
Thompsett, David
2fba717f-67ed-4999-b400-3c3a0681778f

Russell, Andrea E., Maniguet, Stephanie, Mathew, Rebecca J., Yao, Jun, Roberts, Mark A. and Thompsett, David (2001) In situ x-ray absorption spectroscopy and x-ray diffraction of fuel cell electrocatalysts. Journal of Power Sources, 96 (1), 226-232. (doi:10.1016/S0378-7753(01)00573-0).

Record type: Article

Abstract

The utility of in situ X-ray absorption spectroscopy (XAS) in determining structural parameters, through analysis of the extended X-ray absorption fine structure (EXAFS), and electronic perturbations, through a white line analysis of the X-ray absorption near edge structure (XANES), is demonstrated for Pt/C. PtRu/C and PtMo/C fuel cell electrodes. The results provide verification that the enhancement of CO tolerance of the alloy catalysts occurs via an intrinsic mechanism for the PtRu alloy, whilst a promotion mechanism is in operation for the PtMo alloy. Preliminary results of an in situ powder X-ray diffraction (XRD) method which utilises synchrotron radiation (SR) and a curved image plate detector are also presented, using Pd/C as an example. The lattice expansion upon formation of the P-hydride is clearly observed.

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More information

Published date: 1 June 2001
Keywords: fuel cell catalysts, x-ray absorption spectroscopy, x-ray diffraction structure transformation, carbon, particles, state, xas

Identifiers

Local EPrints ID: 19612
URI: http://eprints.soton.ac.uk/id/eprint/19612
ISSN: 0378-7753
PURE UUID: f8a5f0fd-96e7-46d1-8d4b-8082f073100b
ORCID for Andrea E. Russell: ORCID iD orcid.org/0000-0002-8382-6443

Catalogue record

Date deposited: 14 Feb 2006
Last modified: 17 Dec 2019 01:56

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