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), 226-232. (doi:10.1016/S0378-7753(01)00573-0).
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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.
|Keywords:||fuel cell catalysts, x-ray absorption spectroscopy, x-ray diffraction structure transformation, carbon, particles, state, xas|
|Subjects:||T Technology > TP Chemical technology
Q Science > QD Chemistry
|Divisions:||University Structure - Pre August 2011 > School of Chemistry
|Date Deposited:||14 Feb 2006|
|Last Modified:||27 Mar 2014 18:09|
|RDF:||RDF+N-Triples, RDF+N3, RDF+XML, Browse.|
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