Electrospun Nb-doped TiO2 nanofiber support for Pt nanoparticles with high electrocatalytic activity and durability

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This study explores a facile method to prepare an efficient and durable support for Pt catalyst of polymer electrolyte membrane fuel cell (PEMFC). As a candidate, Nb-doped TiO2 (Nb-TiO2) nanofibers are simply fabricated using an electrospinning technique, followed by a heat treatment. Doping Nb into the TiO2 nanofibers leads to a drastic increase in electrical conductivity with doping level of up to 25 at. % (Nb0.25Ti0.75O2). Pt nanoparticles are synthesized on the prepared 25 at. % Nb-doped TiO2-nanofibers (Pt/Nb-TiO2) as well as on a commercial powdered carbon black (Pt/C). The Pt/Nb-TiO2 nanofiber catalyst exhibits similar oxygen reaction reduction (ORR) activity to that of the Pt/C catalyst. However, during an accelerated stress test (AST), the Pt/Nb-TiO2 nanofiber catalyst retained more than 60% of the initial ORR activity while the Pt/C catalyst lost 65% of the initial activity. The excellent durability of the Pt/Nb-TiO2 nanofiber catalyst can be attributed to high corrosion resistance of TiO2 and strong interaction between Pt and TiO2.
Publisher
NATURE PUBLISHING GROUP
Issue Date
2017
Language
English
Article Type
Article
Keywords

MEMBRANE FUEL-CELLS; OXYGEN REDUCTION REACTION; METHANOL OXIDATION; CATALYST SUPPORT; ELECTRICAL-CONDUCTIVITY; CARBON CORROSION; TUNGSTEN-OXIDE; DEGRADATION; ANODE; ENHANCEMENT

Citation

SCIENTIFIC REPORTS, v.7

ISSN
2045-2322
DOI
10.1038/srep44411
URI
http://hdl.handle.net/10203/223550
Appears in Collection
MS-Journal Papers(저널논문)
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