NDLI: Catalytic Performance Comparison of Shape-Dependent Nanocrystals and Oriented Ultrathin Films of Pt$_{4}$Cu Alloy in the Formic Acid Oxidation Process

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Catalytic Performance Comparison of Shape-Dependent Nanocrystals and Oriented Ultrathin Films of Pt$_{4}$Cu Alloy in the Formic Acid Oxidation Process

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Catalytic Performance Comparison of Shape-Dependent Nanocrystals and Oriented Ultrathin Films of Pt$_{4}$Cu Alloy in the Formic Acid Oxidation Process

Content Provider	Springer Nature Link
Author	Bromberg, L. Fayette, M. Martens, B. Luo, Z. P. Wang, Y. Xu, D. Zhang, J. Fang, J. Dimitrov, N.
Copyright Year	2012
Abstract	Research efforts continue to focus on the development of viable and cost-effective fuel cell catalysts with minimized Pt content. This work presents a comparative study between Pt$_{4}$Cu nanocubes and nano-octahedra as well as Pt$_{4}$Cu (100) and (111) thin films used as catalysts for formic acid oxidation. This paper introduces a novel synthetic method for Pt$_{4}$Cu nano-octahedra, and it also demonstrates for the first time the use of surface limited redox replacement of Pb underpotentially deposited layer for epitaxial growth of thin alloy films. Overall, the nanoparticle catalysts exhibit superior performance in terms of durability when compared to their thin film counterparts but feature nearly fivefold lower activity. As a result, it was determined that both types of catalysts accumulate nearly equal charge density in their lifespan. In terms of crystallographic orientation, the results indicate that the nanocubes and Pt$_{4}$Cu (100) thin films outperform the nano-octahedra and Pt$_{4}$Cu (111) thin films in terms of durability but feature equal to slightly lower activity. This significant difference in durability of catalysts with different crystallographic orientation is attributed to interplay of passivation (from CO poisoning and Pt oxidation) and dissolution of Pt. When compared to pure Pt catalysts (nanoparticles and thin films), all of the Pt$_{4}$Cu catalysts in this work exhibit superior performance toward formic acid oxidation in terms of activity and durability.
Starting Page	24
Ending Page	36
Page Count	13
File Format	PDF
ISSN	18682529
Journal	Electrocatalysis
Volume Number	4
Issue Number	1
e-ISSN	18685994
Language	English
Publisher	Springer US
Publisher Date	2012-08-30
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	PtCu alloy Formic acid oxidation Fuel cells Catalyst Activity Durability Electrochemistry Physical Chemistry Catalysis Energy Technology
Content Type	Text
Resource Type	Article
Subject	Electrochemistry

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