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

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), pp. 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

Catalogue record

Date deposited: 14 Feb 2006
Last modified: 17 Jul 2017 16:31

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Contributors

Author: Stephanie Maniguet
Author: Rebecca J. Mathew
Author: Jun Yao
Author: Mark A. Roberts
Author: David Thompsett

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