Magnéli TiO 2 as a High Durability Support for the Proton Exchange Membrane (PEM) Fuel Cell Catalysts

Jivan Thakare and Jahangir Masud
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Jivan Thakare: Energy and Environmental Research Center, University of North Dakota, Grand Forks, ND 58202, USA
Jahangir Masud: Energy and Environmental Research Center, University of North Dakota, Grand Forks, ND 58202, USA

Energies, 2022, vol. 15, issue 12, 1-10

Abstract: Proton exchange membrane fuel cells (PEMFCs) cathode catalysts’ robustness is one of the primary factors determining its long-term performance and durability. This work presented a new class of corrosion-resistant catalyst, Magnél TiO 2 supported Pt (Pt/Ti 9 O 17 ) composite, synthesized. The durability of a Pt/Ti 9 O 17 cathode under the PEMFC operating protocol was evaluated and compared with the state-of-the-art Pt/C catalyst. Like Pt/C, Pt/Ti 9 O 17 exhibited exclusively 4e − oxygen reduction reaction (ORR) in the acidic solution. The accelerated stress tests (AST) were performed using Pt/Ti 9 O 17 and Pt/C catalysts in an O 2 -saturated 0.5 M H 2 SO 4 solution using the potential-steps cycling experiments from 0.95 V to 0.6 V for 12,000 cycles. The results indicated that the electrochemical surface area (ECSA) of the Pt/Ti 9 O 17 is significantly more stable than that of the state-of-the-art Pt/C, and the ECSA loss after 12,000 potential cycles is only 10 ± 2% for Pt/Ti 9 O 17 composite versus 50 ± 5% for Pt/C. Furthermore, the current density and onset potential at the ORR polarization curve at Pt/C were significantly affected by the AST test. In contrast, the same remained almost constant at the modified electrode, Pt/Ti 9 O 17 . This demonstrated the excellent stability of Pt nanoparticles supported on Ti 9 O 17 .

Keywords: catalyst support; catalyst stability; Magnéli; TiO 2; Ti 9 O 17; ORR; PEM fuel cell; automotive fuel cell; high durability; high stability; corrosion resistance (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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