Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 201, Issue -, Pages 419-429Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apcatb.2016.08.041
Keywords
Platinum; Titanium suboxides; Molybdenum; Oxygen reduction reaction (ORR); Stability
Funding
- Italian Ministry of Education, University, and Research [2010CYTWAW]
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Recently the use of titanium oxide and titanium suboxides (Magneli phases) has been extensively investigated as an alternative catalyst support to carbon-based materials for the oxygen reduction reaction in low-temperature fuel cells. In this study, a 15 wt.% Pt-based catalyst was developed on a unique, stable mix of titanium suboxides, with a prevailing of the Ti3O5 phase, doped with Mo, as a Ti3O3-Mo carbon-free support and compared to a commercial 20 wt.% Pt/C (E-TEK). The Pt/Ti3O3-Mo catalyst exhibits excellent electroactivity and stability toward the ORR, reaching a performance of 73.3 mA mg(-1), slightly more than the double of the commercial Pt/C, with a current density of 1.1 mA cm(-2) at 0.9 V vs RHE, and an half-wave potential of 0.86 V vs RHE. A deep accelerated potential cycling between 0 and 1.2 V vs RHE up to 5000 cycles demonstrated the remarkable stability of the Pt/Ti3O3-Mo catalyst, whose electrochemical surface area loss was accounted for only 11%, compared to the more than 81% loss of the commercial Pt/C reference. (C) 2016 Elsevier B.V. All rights reserved.
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