fulltext.study @t Gmail

Electro-oxidation of ethanol on ternary Pt–Sn–Ce/C catalysts

Paper ID Volume ID Publish Year Pages File Format Full-Text
45547 46416 2015 9 PDF Available
Title
Electro-oxidation of ethanol on ternary Pt–Sn–Ce/C catalysts
Abstract

•Carbon supported Pt–Sn–Ce catalysts were prepared by a modified formic acid method.•The EOR onset potential decreased with increasing Sn content on catalyst surface.•The effect of Ce on the EOR activity of PtSnCe/C catalysts depended on the potential.•PtSnCe/C catalysts were more poisoning tolerant than the Pt–Ce/C catalysts.•PtSnCe/C catalysts were less poisoning tolerant than Pt/C and Pt–Sn/C.

Ternary Pt–Sn–Ce/C catalysts were prepared by a modified formic acid method, and their activity for the ethanol oxidation reaction (EOR) was compared to that of Pt–Sn/C, Pt–Ce/C and Pt/C catalysts. No bulk alloy formation was detected by XRD analysis. XPS measurements indicated no segregation on the catalyst surface and the presence of Sn(0) and SnOx, Ce2O3 and CeO2 oxides. The onset potential for CH3CH2OH oxidation on Pt–Sn/C and Pt–Sn–Ce/C (60:20:20) catalysts, which have the highest Sn content on the surface, was lower than that of Pt–Sn–Ce/C (70:20:10) and (50:20:30), Pt–Ce/C and Pt/C catalysts. This work highlights the dependence on the potential of the effect of cerium in Pt–Sn–Ce/C catalysts on the EOR activity and on the reaction mechanism. By derivative voltammograms, different reaction pathways at different potentials, involving Sn (at ca. 0.44 V vs. RHE), Sn + Ce (at ca. 0.55 V vs. RHE) and Ce (at ca. 0.67 V vs. RHE) were inferred. The Pt–Sn–Ce/C catalysts were less tolerant to poisoning by ethanol oxidation intermediate species than Pt/C and Pt–Sn/C, but more stable than Pt–Ce/C catalysts. DEFC tests at 90 °C indicated that a higher Sn surface content is more effective for ethanol oxidation than the addition of Ce to Pt–Sn/C.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Ternary catalysts; Pt–Sn–Ce/C; Fuel cell; Ethanol oxidation
First Page Preview
Electro-oxidation of ethanol on ternary Pt–Sn–Ce/C catalysts
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
Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 165, April 2015, Pages 176–184
Authors
, , , , ,
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