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

Russell, Andrea E. and Maniguet, Stephanie and Mathew, Rebecca J. and Yao, Jun and 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 . ISSN 0378-7753

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Full text URL: http://dx.doi.org/10.1016/S0378-7753(01)00573-0

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 β-hydride is clearly observed.

Item Type:Article
Additional Information: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 β-hydride is clearly observed.
Keywords:Fuel cell catalysts; X-ray absorption spectroscopy; X-ray diffraction
Subjects:F Physical Sciences > F342 Quantum Mechanics
F Physical Sciences > F170 Physical Chemistry
F Physical Sciences > F130 Structural Chemistry
F Physical Sciences > F180 Analytical Chemistry
Divisions:College of Science > School of Engineering
ID Code:5435
Deposited By: Jun Yao
Deposited On:07 May 2012 17:18
Last Modified:09 May 2012 10:25

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