Recently the use of titanium oxide and titanium suboxides (Magnéli 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 Ti3O5-Mo carbon-free support and compared to a commercial 20 wt.% Pt/C (E-TEK). The Pt/Ti3O5-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/Ti3O5-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

Innovative carbon-free low content Pt catalyst supported on Mo-doped titanium suboxide (Ti3O5-Mo) for stable and durable oxygen reduction reaction / ALIPOUR MOGHADAM ESFAHANI, Reza; VANKOVA KRASIMIROVA, Svetoslava; MONTEVERDE VIDELA, ALESSANDRO HUGO; Specchia, Stefania. - In: APPLIED CATALYSIS. B, ENVIRONMENTAL. - ISSN 0926-3373. - STAMPA. - 201:(2017), pp. 419-429. [10.1016/j.apcatb.2016.08.041]

Innovative carbon-free low content Pt catalyst supported on Mo-doped titanium suboxide (Ti3O5-Mo) for stable and durable oxygen reduction reaction

ALIPOUR MOGHADAM ESFAHANI, REZA;VANKOVA KRASIMIROVA, SVETOSLAVA;MONTEVERDE VIDELA, ALESSANDRO HUGO;SPECCHIA, STEFANIA
2017

Abstract

Recently the use of titanium oxide and titanium suboxides (Magnéli 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 Ti3O5-Mo carbon-free support and compared to a commercial 20 wt.% Pt/C (E-TEK). The Pt/Ti3O5-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/Ti3O5-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
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11583/2648491
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