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Main Title: Efficient C-C bond splitting on Pt monolayer and sub-monolayer catalysts during ethanol electro-oxidation: Pt layer strain and morphology effects
Author(s): Loukrakpam, Rameshwori
Yuan, Qiuyi
Petkov, Valeri
Gan, Lin
Rudi, Stefan
Yang, Ruizhi
Huang, Yunhui
Brankovic, Stanko R.
Strasser, Peter
Type: Article
Language Code: en
Abstract: Efficient catalytic C–C bond splitting coupled with complete 12-electron oxidation of the ethanol molecule to CO2is reported on nanoscale electrocatalysts comprised of a Pt monolayer (ML) and sub-monolayer (sML) deposited on Au nanoparticles (Au@Pt ML/sML). The Au@Pt electrocatalysts were synthesized using surface limited redox replacement (SLRR) of an underpotentially deposited (UPD) Cu monolayer in an electrochemical cell reactor. Au@Pt ML showed improved catalytic activity for ethanol oxidation reaction (EOR) and, unlike their Pt bulk and Pt sML counterparts, was able to generate CO2at very low electrode potentials owing to efficient C–C bond splitting. To explain this, we explore the hypothesis that competing strain effects due to the Pt layer coverage/morphology (compressive) and the Pt–Au lattice mismatch (tensile) control surface chemisorption and overall activity. Control experiments on well-defined model Pt monolayer systems are carried out involving a wide array of methods such as high-energy X-ray diffraction, pair-distribution function (PDF) analysis,in situelectrochemical FTIR spectroscopy, andin situscanning tunneling microscopy. The vibrational fingerprints of adsorbed CO provide compelling evidence on the relation between surface bond strength, layer strain and morphology, and catalytic activity.
Issue Date: 2014
Date Available: 22-Jun-2016
DDC Class: 540 Chemie und zugeordnete Wissenschaften
Sponsor/Funder: BMBF, 16N11929, Netzwerk TU9/CN Elektromobilität - Teilvorhaben: Brennstoffzellen Range-Extender
Journal Title: Physical chemistry, chemical physics
Publisher: Royal Society of Chemistry
Publisher Place: Cambridge
Volume: 16
Issue: 35
Publisher DOI: 10.1039/c4cp02791d
Page Start: 18866
Page End: 18876
EISSN: 1463-9076
Appears in Collections:FG Technische Chemie » Publications

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