Surface segregation and oxidation of Pt3Ni(1 1 1) alloys under oxygen environment

H. C. Lee; B. M. Kim; C. K. Jeong; R. Toyoshima; H. Kondoh; T. Shimada; K. Mase; B. Mao; Z. Liu; H. Lee; Chuan Qi Huang; W. X. Li; P. N. Ross; B. S. Mun

doi:10.1016/j.cattod.2015.05.003

Surface segregation and oxidation of Pt₃Ni(1 1 1) alloys under oxygen environment

H. C. Lee, B. M. Kim, C. K. Jeong, R. Toyoshima, H. Kondoh, T. Shimada, K. Mase, B. Mao, Z. Liu, H. Lee, Chuan Qi Huang, W. X. Li, P. N. Ross, B. S. Mun

Department of Chemistry

Research output: Contribution to journal › Article › peer-review

25 Citations (Scopus)

Abstract

Utilizing ambient pressure X-ray photoelectron spectroscopy (AP-XPS), the surface segregation and oxidation of Pt₃Ni(1 1 1) alloys are investigated as a function of temperature and oxygen pressure. The in situ AP-XPS measurements of oxygen oxidation process show that the Pt "skin" surface is not stable under the exposure of oxygen pressure of 100 mTorr at room temperature. As the temperature and pressure are elevated, the formations of Ni₂O₃, NiO_x, and NiO are observed on surface while Pt atom starts to reduce its adsorbed oxygen, which is a clear sign of surface segregation of Ni to surface. Upon the evacuation of oxygen gas, i.e. ultrahigh vacuum condition, both of NiO_x and NiO oxide get reduced and Ni₂O₃ remains on the surface. The DFT calculation is employed to explain the formation of surface oxides under oxidation condition.

Original language	English
Pages (from-to)	3-7
Number of pages	5
Journal	Catalysis Today
Volume	260
DOIs	https://doi.org/10.1016/j.cattod.2015.05.003
Publication status	Published - 2016 Feb 1

Keywords

Ambient pressure XPS
DFT
Metal oxidation
Pt alloys
Surface segregation

ASJC Scopus subject areas

Catalysis
Chemistry(all)

Access to Document

10.1016/j.cattod.2015.05.003

Cite this

@article{3dc0cdd2074d4dd380d1d28499150efe,

title = "Surface segregation and oxidation of Pt3Ni(1 1 1) alloys under oxygen environment",

abstract = "Utilizing ambient pressure X-ray photoelectron spectroscopy (AP-XPS), the surface segregation and oxidation of Pt3Ni(1 1 1) alloys are investigated as a function of temperature and oxygen pressure. The in situ AP-XPS measurements of oxygen oxidation process show that the Pt {"}skin{"} surface is not stable under the exposure of oxygen pressure of 100 mTorr at room temperature. As the temperature and pressure are elevated, the formations of Ni2O3, NiOx, and NiO are observed on surface while Pt atom starts to reduce its adsorbed oxygen, which is a clear sign of surface segregation of Ni to surface. Upon the evacuation of oxygen gas, i.e. ultrahigh vacuum condition, both of NiOx and NiO oxide get reduced and Ni2O3 remains on the surface. The DFT calculation is employed to explain the formation of surface oxides under oxidation condition.",

keywords = "Ambient pressure XPS, DFT, Metal oxidation, Pt alloys, Surface segregation",

author = "Lee, {H. C.} and Kim, {B. M.} and Jeong, {C. K.} and R. Toyoshima and H. Kondoh and T. Shimada and K. Mase and B. Mao and Z. Liu and H. Lee and Huang, {Chuan Qi} and Li, {W. X.} and Ross, {P. N.} and Mun, {B. S.}",

note = "Funding Information: This work was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology ( NRF-2012R1A1A2001745 ). This work was also supported by GIST College's 2013 GUP Research Fund and MSIP and PAL , XFEL project (SP-12), Korea. WXL was supported by the National Natural Science Foundation of China ( 21173210 and 21225315 ) and the National Basic Research Program of China (973 Program, 2013CB834603 ). Publisher Copyright: {\textcopyright} 2015 Elsevier B.V. All rights reserved.",

year = "2016",

month = feb,

day = "1",

doi = "10.1016/j.cattod.2015.05.003",

language = "English",

volume = "260",

pages = "3--7",

journal = "Catalysis Today",

issn = "0920-5861",

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TY - JOUR

T1 - Surface segregation and oxidation of Pt3Ni(1 1 1) alloys under oxygen environment

AU - Lee, H. C.

AU - Kim, B. M.

AU - Jeong, C. K.

AU - Toyoshima, R.

AU - Kondoh, H.

AU - Shimada, T.

AU - Mase, K.

AU - Mao, B.

AU - Liu, Z.

AU - Lee, H.

AU - Huang, Chuan Qi

AU - Li, W. X.

AU - Ross, P. N.

AU - Mun, B. S.

N1 - Funding Information: This work was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology ( NRF-2012R1A1A2001745 ). This work was also supported by GIST College's 2013 GUP Research Fund and MSIP and PAL , XFEL project (SP-12), Korea. WXL was supported by the National Natural Science Foundation of China ( 21173210 and 21225315 ) and the National Basic Research Program of China (973 Program, 2013CB834603 ). Publisher Copyright: © 2015 Elsevier B.V. All rights reserved.

PY - 2016/2/1

Y1 - 2016/2/1

N2 - Utilizing ambient pressure X-ray photoelectron spectroscopy (AP-XPS), the surface segregation and oxidation of Pt3Ni(1 1 1) alloys are investigated as a function of temperature and oxygen pressure. The in situ AP-XPS measurements of oxygen oxidation process show that the Pt "skin" surface is not stable under the exposure of oxygen pressure of 100 mTorr at room temperature. As the temperature and pressure are elevated, the formations of Ni2O3, NiOx, and NiO are observed on surface while Pt atom starts to reduce its adsorbed oxygen, which is a clear sign of surface segregation of Ni to surface. Upon the evacuation of oxygen gas, i.e. ultrahigh vacuum condition, both of NiOx and NiO oxide get reduced and Ni2O3 remains on the surface. The DFT calculation is employed to explain the formation of surface oxides under oxidation condition.

AB - Utilizing ambient pressure X-ray photoelectron spectroscopy (AP-XPS), the surface segregation and oxidation of Pt3Ni(1 1 1) alloys are investigated as a function of temperature and oxygen pressure. The in situ AP-XPS measurements of oxygen oxidation process show that the Pt "skin" surface is not stable under the exposure of oxygen pressure of 100 mTorr at room temperature. As the temperature and pressure are elevated, the formations of Ni2O3, NiOx, and NiO are observed on surface while Pt atom starts to reduce its adsorbed oxygen, which is a clear sign of surface segregation of Ni to surface. Upon the evacuation of oxygen gas, i.e. ultrahigh vacuum condition, both of NiOx and NiO oxide get reduced and Ni2O3 remains on the surface. The DFT calculation is employed to explain the formation of surface oxides under oxidation condition.

KW - Ambient pressure XPS

KW - DFT

KW - Metal oxidation

KW - Pt alloys

KW - Surface segregation

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