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Highly active and stable Pt electrocatalysts promoted by antimony-doped SnO2 supports for oxygen reduction reactions

Paper ID Volume ID Publish Year Pages File Format Full-Text
45342 46410 2014 9 PDF Available
Title
Highly active and stable Pt electrocatalysts promoted by antimony-doped SnO2 supports for oxygen reduction reactions
Abstract

•Sb doped SnO2 nanoparticles (ATO) synthesized with conductivity of 1.13 S cm−1.•Pt nanocatalysts supported on ATO and ATO composite prepared.•Higher specific activity and improved stability for Pt/ATO.•Higher mass activity and improved stability for Pt/C-ATO.•Active and durable catalysts due to the ATO phase and its modification of Pt electronic structure.

Alternative composite supports for platinum catalysts were synthesized from antimony doped tin dioxide (ATO) nanoparticles. In the range of the antimony content from 0 to 11 mol%, the highest electrical conductivity of 1.1 S cm−1 at 130 °C was obtained for the 5 mol% Sb ATO, from which composite supports composed of oxides and carbon and supported platinum catalysts were prepared. Using the pure oxide support, the Pt/ATO catalyst displayed superior specific activity and stability for the oxygen reduction reactions (ORRs). Low surface area of ATO caused poor dispersion of Pt particles compared to composite supports, which limited the mass activity of the supported catalysts. When the ATO composites were used as supports, the Pt/C-ATO catalysts showed significantly enhanced catalytic activity and durability for the ORR, attributable to the high ECSA and modified electronic structure of Pt by the ATO phase in the catalyst support.

Graphical abstractAntimony doped tin dioxide (ATO) nanoparticles with high electrical conductivity were employed as the alternative support for Pt catalysts for oxygen reduction reactions. The synthesized catalysts displayed the superior activity and stability for ORR with ATO or its composite as support, attributed to the modified electronic structure of Pt by the ATO phase.Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Platinum; Antimony doped tin oxides; Support; Oxygen reduction reactions; Fuel cells
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Highly active and stable Pt electrocatalysts promoted by antimony-doped SnO2 supports for oxygen reduction reactions
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 144, January 2014, Pages 112–120
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us