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Highly durable Pt cathode catalysts for polymer electrolyte fuel cells; coverage of carbon black-supported Pt catalysts with silica layers

Paper ID Volume ID Publish Year Pages File Format Full-Text
41082 45876 2011 9 PDF Available
Title
Highly durable Pt cathode catalysts for polymer electrolyte fuel cells; coverage of carbon black-supported Pt catalysts with silica layers
Abstract

Carbon black-supported Pt (Pt/CB) catalysts that have been used at the cathode in state of the art polymer electrolyte fuel cell (PEFC) were covered with silica layers to improve the durability of the Pt catalysts under PEFC cathode conditions. The durability of silica-coated Pt/CB to potential cycling between 0.6 and 0.9 V (vs. reversible hydrogen electrode (RHE)) was strongly dependent on the thickness of the silica layers, i.e., the durability of Pt/CB improved after coverage with thick silica layers. However, the coverage of the whole surface of the Pt/CB catalysts with silica layers produced electrochemically inactive Pt catalysts. Silica-coated Pt/CB catalysts with an optimal silica layer thickness showed similar activity for the oxygen reduction reaction compared to Pt/CB catalysts without a silica coating, and they had excellent durability at the cathode in a PEFC single cell. Coverage with silica layers improved the durability of the Pt/CB cathode catalysts without a decrease in the catalytic activity for the oxygen reduction reaction.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (231 K)Download as PowerPoint slideHighlights► Coverage of carbon black-supported Pt metal with silica layers (SiO2/Pt/CB). ► SiO2/Pt/CB cathode catalyst for oxygen reduction in fuel cells. ► Coverage of Pt/CB with silica inhibits Pt metal growth under cathode conditions. ► Coverage with silica does not decrease the catalytic activity of Pt/CB.

Keywords
Carbon black-supported Pt electrocatalysts; Polymer electrolyte fuel cell; Cathode catalyst durability; Silica-coating
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Highly durable Pt cathode catalysts for polymer electrolyte fuel cells; coverage of carbon black-supported Pt catalysts with silica layers
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volumes 409–410, 15 December 2011, Pages 248–256
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