Probing the nanoscale structure of the catalytically active overlayer on Pt alloys with rare earths

Anders F. Pedersen; Elisabeth T. Ulrikkeholm; María Escudero Escribano; Tobias P. Johansson; Paolo Malacrida; Christoffer M. Pedersen; Martin Hangaard Hansen; Kim D. Jensen; Jan Rossmeisl; Daniel Friebel; Anders Nilsson; Ib Chorkendorff; Ifan E. L. Stephens

doi:10.1016/j.nanoen.2016.05.026

Probing the nanoscale structure of the catalytically active overlayer on Pt alloys with rare earths

Anders F. Pedersen, Elisabeth T. Ulrikkeholm, María Escudero Escribano, Tobias P. Johansson, Paolo Malacrida, Christoffer M. Pedersen, Martin Hangaard Hansen, Kim D. Jensen, Jan Rossmeisl, Daniel Friebel, Anders Nilsson, Ib Chorkendorff, Ifan E. L. Stephens

Department of Chemistry

35 Citations (Scopus)

Abstract

Pt_xY and Pt_xGd exhibit exceptionally high activity for oxygen reduction, both in the polycrystalline form and the nanoparticulate form. In order to understand the origin of the enhanced activity of these alloys, we have investigated thin films of these alloys on bulk Pt(111) crystals, i.e. Y/Pt(111) and Gd/Pt(111). These surfaces exhibit a 4-fold improvement over Pt(111). We observe the formation of a thick Pt overlayer after the electrochemical measurements, both on Y/Pt(111) and Gd/Pt(111). Using surface sensitive X-ray diffraction we revealed that crystalline closely packed Pt overlayers were formed. The diffraction experiments showed that the strain and crystallinity of the overlayers are strongly dependent on the electrochemical treatment, and in general show lateral compression.

Original language	English
Journal	Nano Energy
Volume	29
Pages (from-to)	249-260
Number of pages	12
ISSN	2211-2855
DOIs	https://doi.org/10.1016/j.nanoen.2016.05.026
Publication status	Published - 2016

Keywords

Diffraction
Electrocatalysis
Oxygen reduction
Pt(111)
Pt-alloys

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10.1016/j.nanoen.2016.05.026

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Pedersen, A. F., Ulrikkeholm, E. T., Escudero Escribano, M., Johansson, T. P., Malacrida, P., Pedersen, C. M., Hansen, M. H., Jensen, K. D., Rossmeisl, J., Friebel, D., Nilsson, A., Chorkendorff, I., & Stephens, I. E. L. (2016). Probing the nanoscale structure of the catalytically active overlayer on Pt alloys with rare earths. Nano Energy, 29, 249-260. https://doi.org/10.1016/j.nanoen.2016.05.026

Pedersen, AF, Ulrikkeholm, ET, Escudero Escribano, M, Johansson, TP, Malacrida, P, Pedersen, CM, Hansen, MH, Jensen, KD, Rossmeisl, J, Friebel, D, Nilsson, A, Chorkendorff, I & Stephens, IEL 2016, 'Probing the nanoscale structure of the catalytically active overlayer on Pt alloys with rare earths', Nano Energy, vol. 29, pp. 249-260. https://doi.org/10.1016/j.nanoen.2016.05.026

@article{4cca4830c9024d35aa8318fee1cd5789,

title = "Probing the nanoscale structure of the catalytically active overlayer on Pt alloys with rare earths",

abstract = "PtxY and PtxGd exhibit exceptionally high activity for oxygen reduction, both in the polycrystalline form and the nanoparticulate form. In order to understand the origin of the enhanced activity of these alloys, we have investigated thin films of these alloys on bulk Pt(111) crystals, i.e. Y/Pt(111) and Gd/Pt(111). These surfaces exhibit a 4-fold improvement over Pt(111). We observe the formation of a thick Pt overlayer after the electrochemical measurements, both on Y/Pt(111) and Gd/Pt(111). Using surface sensitive X-ray diffraction we revealed that crystalline closely packed Pt overlayers were formed. The diffraction experiments showed that the strain and crystallinity of the overlayers are strongly dependent on the electrochemical treatment, and in general show lateral compression.",

keywords = "Diffraction, Electrocatalysis, Oxygen reduction, Pt(111), Pt-alloys",

author = "Pedersen, {Anders F.} and Ulrikkeholm, {Elisabeth T.} and {Escudero Escribano}, Mar{\'i}a and Johansson, {Tobias P.} and Paolo Malacrida and Pedersen, {Christoffer M.} and Hansen, {Martin Hangaard} and Jensen, {Kim D.} and Jan Rossmeisl and Daniel Friebel and Anders Nilsson and Ib Chorkendorff and Stephens, {Ifan E. L.}",

year = "2016",

doi = "10.1016/j.nanoen.2016.05.026",

language = "English",

volume = "29",

pages = "249--260",

journal = "Nano Energy",

issn = "2211-2855",

publisher = "Elsevier",

}

TY - JOUR

T1 - Probing the nanoscale structure of the catalytically active overlayer on Pt alloys with rare earths

AU - Pedersen, Anders F.

AU - Ulrikkeholm, Elisabeth T.

AU - Escudero Escribano, María

AU - Johansson, Tobias P.

AU - Malacrida, Paolo

AU - Pedersen, Christoffer M.

AU - Hansen, Martin Hangaard

AU - Jensen, Kim D.

AU - Rossmeisl, Jan

AU - Friebel, Daniel

AU - Nilsson, Anders

AU - Chorkendorff, Ib

AU - Stephens, Ifan E. L.

PY - 2016

Y1 - 2016

N2 - PtxY and PtxGd exhibit exceptionally high activity for oxygen reduction, both in the polycrystalline form and the nanoparticulate form. In order to understand the origin of the enhanced activity of these alloys, we have investigated thin films of these alloys on bulk Pt(111) crystals, i.e. Y/Pt(111) and Gd/Pt(111). These surfaces exhibit a 4-fold improvement over Pt(111). We observe the formation of a thick Pt overlayer after the electrochemical measurements, both on Y/Pt(111) and Gd/Pt(111). Using surface sensitive X-ray diffraction we revealed that crystalline closely packed Pt overlayers were formed. The diffraction experiments showed that the strain and crystallinity of the overlayers are strongly dependent on the electrochemical treatment, and in general show lateral compression.

AB - PtxY and PtxGd exhibit exceptionally high activity for oxygen reduction, both in the polycrystalline form and the nanoparticulate form. In order to understand the origin of the enhanced activity of these alloys, we have investigated thin films of these alloys on bulk Pt(111) crystals, i.e. Y/Pt(111) and Gd/Pt(111). These surfaces exhibit a 4-fold improvement over Pt(111). We observe the formation of a thick Pt overlayer after the electrochemical measurements, both on Y/Pt(111) and Gd/Pt(111). Using surface sensitive X-ray diffraction we revealed that crystalline closely packed Pt overlayers were formed. The diffraction experiments showed that the strain and crystallinity of the overlayers are strongly dependent on the electrochemical treatment, and in general show lateral compression.

KW - Diffraction

KW - Electrocatalysis

KW - Oxygen reduction

KW - Pt(111)

KW - Pt-alloys

U2 - 10.1016/j.nanoen.2016.05.026

DO - 10.1016/j.nanoen.2016.05.026

M3 - Journal article

AN - SCOPUS:84973574859

SN - 2211-2855

VL - 29

SP - 249

EP - 260

JO - Nano Energy

JF - Nano Energy

ER -

Probing the nanoscale structure of the catalytically active overlayer on Pt alloys with rare earths

Abstract

Keywords

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