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.; Thompsett, David

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. © 2001 Elsevier Science B.V.

• Journal Article Type: Article
• Acceptance Date: Jan 14, 2021
• Online Publication Date: Jun 8, 2021
• Publication Date: Jun 1, 2001
• Deposit Date: Apr 17, 2021
• Journal: Journal of Power Sources
• Print ISSN: 0378-7753
• Publisher: Elsevier
• Peer Reviewed: Peer Reviewed
• Volume: 96
• Issue: 1
• Pages: 226-232
• DOI: https://doi.org/10.1016/S0378-7753%2801%2900573-0
• Public URL: https://uwe-repository.worktribe.com/output/7268490