Please use this identifier to cite or link to this item: http://dx.doi.org/10.14279/depositonce-5296
Main Title: Bifunctional anode catalysts for direct methanol fuel cells
Author(s): Rossmeisl, Jan
Ferrin, Peter
Tritsaris, Georgios A.
Nilekar, Anand Udaykumar
Koh, Shirlaine
Bae, Sang Eun
Brankovic, Stanko R.
Strasser, Peter
Mavrikakis, Manos
Type: Article
Language Code: en
Abstract: Using the binding energy of OH* and CO* on close-packed surfaces as reactivity descriptors, we screen bulk and surface alloy catalysts for methanol electro-oxidation activity. Using these two descriptors, we illustrate that a good methanol electro-oxidation catalyst must have three key properties: (1) the ability to activate methanol, (2) the ability to activate water, and (3) the ability to react off surface intermediates (such as CO* and OH*). Based on this analysis, an alloy catalyst made up of Cu and Pt should have a synergistic effect facilitating the activity towards methanol electro-oxidation. Using these two reactivity descriptors, a surface PtCu3 alloy is proposed to have the best catalytic properties of the Pt–Cu model catalysts tested, similar to those of a Pt–Ru bulk alloy. To validate the model, experiments on a Pt(111) surface modified with different amounts of Cu adatoms are performed. Adding Cu to a Pt(111) surface increases the methanol oxidation current by more than a factor of three, supporting our theoretical predictions for improved electrocatalysts.
URI: http://depositonce.tu-berlin.de/handle/11303/5676
http://dx.doi.org/10.14279/depositonce-5296
Issue Date: 2012
Date Available: 28-Jun-2016
DDC Class: 690 Hausbau, Bauhandwerk
Sponsor/Funder: DFG, EXC 314, Unifying Concepts in Catalysis
Usage rights: Terms of German Copyright Law
Journal Title: Energy & environmental science
Publisher: Royal Society of Chemistry
Publisher Place: Cambridge
Volume: 5
Issue: 8
Publisher DOI: 10.1039/c2ee21455e
Page Start: 8335
Page End: 8342
EISSN: 1754-5692
Notes: Dieser Beitrag ist mit Zustimmung des Rechteinhabers aufgrund einer (DFG geförderten) Allianz- bzw. Nationallizenz frei zugänglich.
This publication is with permission of the rights owner freely accessible due to an Alliance licence and a national licence (funded by the DFG, German Research Foundation) respectively.
Appears in Collections:Technische Universität Berlin » Fakultäten & Zentralinstitute » Fakultät 2 Mathematik und Naturwissenschaften » Institut für Chemie » Fachgebiet Technische Chemie » Publications

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