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Surface reconstruction enhancing activity of Pt/C for formic acid electrooxidation by ultrasonic mixing with Pb/C and electrochemical activation process

Paper ID Volume ID Publish Year Pages File Format Full-Text
45994 46428 2013 7 PDF Available
Title
Surface reconstruction enhancing activity of Pt/C for formic acid electrooxidation by ultrasonic mixing with Pb/C and electrochemical activation process
Abstract

The control for surface of catalysts is intrinsically required to improve catalytic efficiency. In current work, we demonstrate that the surface of Pt/C catalyst can be effectively reconstructed by ultrasonic mixing with Pb/C in an acidic environment and electorchemical activation process. As a result, the surface-reconstructed Pt/C catalyst exhibits a significant enhancement of activity of a ca. 10-fold improvement in mass activity and a ca. 38-fold improvement in specific activity as compared with a pure Pt/C catalyst for formic acid electroxidation (FAEO). The evidences show that some of Pb species are transferred from Pb/C to surface of Pt/C catalyst probably through the dissolution–adsorption pathway during ultrasonic mixing and electorchemical activation processes. The presence of Pb on surface of Pt not only isolates the continuous Pt sites through the third-body effect but also modifies electronic band structure of platinum via electronic effect, which leads to that the direct pathway is preferably occurred and the CO formation is effectively inhibited. These results provide useful information for further understanding the promotion mechanism of Pb ad-atom during FAEO and rationally controlling the catalytic surface to improve catalytic efficiency.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► Pt/C + Pb/C catalyst was obtained by ultrasonic mixing of Pt/C and Pb/C. ► Surface reconstruction of Pt/C + Pb/C catalyst occurred in acidic electrolyte. ► Pt/C + Pb/C catalyst exhibited enhanced activity for formic acid electrooxidation. ► The direct pathway is preferably occurred on Pt/C + Pb/C catalyst. ► Third-body effect and electronic effect are responsible for this enhancement.

Keywords
Surface reconstruction; Formic acid fuel cell; Platinum; Lead; Ultrasonic mixing; Electronic effect; Third-body effect
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Surface reconstruction enhancing activity of Pt/C for formic acid electrooxidation by ultrasonic mixing with Pb/C and electrochemical activation process
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 129, 17 January 2013, Pages 146–152
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