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- W4248012881 abstract "Polymer electrolyte fuel cells (PEFCs) are suitable for fuel cell vehicles (FCVs) because the PEFCs have high efficiency, high responsibility and high performance, but the critical issues of PEFCs are the cost and the durability of the fuel cell stack. The development of PEFCs requires increased operating temperature, over 100 °C, for high efficiency FCV systems. In addition, the PEFCs of fuel cell buses and trucks need to have higher durability of the fuel cell stack than that of passenger cars. With increasing operating temperature under start-up/shut-down condition, carbon black supports for platinum undergo accelerated corrosion, while niobium-doped tin oxide supports undergo negligible corrosion. We invented a highly durable SnO2 nanoparticle support with a fused aggregate network structure as a new candidate to replace carbon [1-4] and found a novel platinum anti-dissolution mechanism of Pt/Nb-SnO2 cathode catalyst layers (CLs) during load cycling under an oxygen atmosphere, which was not found in the case of Pt/GCB (graphitized carbon black) CLs. The load cycle durability of Pt/Nb-SnO2 CLs increased with increasing cathode oxygen concentration, while that of Pt/GCB CLs decreased. When the Pt nanoparticles (NPs) on the Nb-SnO2 support are oxidized by oxygen in the cathode at the open circuit voltage (OCV), the availability of free electrons in the Pt NPs decrease, and thus the supply of free electrons to the depletion layer on the surface of Nb-SnO2 becomes difficult. This effect would be particularly evident for the high cathode oxygen concentration [5]." @default.
- W4248012881 created "2022-05-12" @default.
- W4248012881 date "2019-01-01" @default.
- W4248012881 modified "2023-09-30" @default.
- W4248012881 title "Effects of Various Operating Conditions on Load Cycle Durability of Pt/Nb-SnO2 Cathode Catalyst Layers" @default.
- W4248012881 doi "https://doi.org/10.1149/ma2019-02/35/1586" @default.
- W4248012881 hasPublicationYear "2019" @default.
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