Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 158, Issue -, Pages 112-118Publisher
ELSEVIER
DOI: 10.1016/j.apcatb.2014.04.003
Keywords
Pt-based fuel cell electrocatalysts; Oxide supports; Charge transfer; Lattice strain; Oxygen reduction reaction
Funding
- National Research Foundation of Korea Grant - Korean Government [NRF-2012R1A1A2007624, NRF-2012K2A1A2032856, NRF-2012-M1A2A2-029543, KCRC-2013M1A8A1040703]
- National Research Foundation of Korea [2013M1A8A1040703] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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In this study, we have attempted to clarify the origin of the enhanced oxygen reduction reaction (ORR) activity of Pt on titania supports, which has been the subject of significant debate. To date, it has been claimed in several studies that the charge transfer from titania to Pt is the main origin of the enhanced ORR activity, while the theoretical adsorption model suggested that such charge transfer to Pt could lead to stronger OH adsorption and therefore a negative effect on ORR activity. We resolve this controversy by considering a lattice strain effect induced by the strong metal support interaction. EXAFS studies clearly show that a compressive strain leading to a lower d-band center is exerted on the Pt lattice on the titania-based supports. Hence, we strongly suggest that the main origin for the enhanced ORR activity is the compressive strain rather than the charge transfer. (C) 2014 Elsevier B.V. All rights reserved.
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