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Use of carbon monoxide and cyanide to probe the active sites on nitrogen-doped carbon catalysts for oxygen reduction

Paper ID Volume ID Publish Year Pages File Format Full-Text
46689 46445 2012 8 PDF Available
Title
Use of carbon monoxide and cyanide to probe the active sites on nitrogen-doped carbon catalysts for oxygen reduction
Abstract

Interaction of carbon monoxide with CNx catalysts was investigated using pulse chemisorption, DRIFTS, and cyclic voltammetry techniques. Pulsed chemisorption experiments showed no CO uptake over the CNx catalysts. Cyclic voltammetry and potential hold studies showed carbon monoxide not to have any electrocatalytic interaction with nitrogen-doped graphite surfaces and not to have any poisoning effect for the oxygen reduction reaction. This is in contrast to the preferential adsorption of CO in the presence of oxygen on ORR sites of Pt catalysts, inhibiting the oxygen reduction activity drastically. Cyanide poisoning experiments performed using KCN showed no activity loss for CNx, while Pt/VC catalysts showed significant deactivation. These studies suggest that it is unlikely for coordinated metal sites to have significant contribution to the oxygen reduction reaction in CNx catalysts.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► The interaction of CO on nitrogen-doped graphite (CNx) was investigated. ► Pt supported on Vulcan carbon was used in similar experiments for comparison. ► In an acidic half-cell saturated with CO and O2, CO poisoned Pt, but did not affect CNx. ► CO was found to chemisorb and react on Pt, but did not interact with CNx. ► CNx catalysts did not show any poisoning by cyanide.

Keywords
CNx; Nitrogen-doped graphite; Carbon monoxide; Cyanide; Poisoning; Platinum; Oxygen reduction; ORR
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Use of carbon monoxide and cyanide to probe the active sites on nitrogen-doped carbon catalysts for oxygen reduction
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volumes 113–114, 22 February 2012, Pages 126–133
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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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