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

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

doi:10.1016/j.cattod.2015.05.003

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

Journal Article · Fri Jun 05 04:00:00 EDT 2015 · Catalysis Today

DOI:https://doi.org/10.1016/j.cattod.2015.05.003· OSTI ID:1405292

Lee, H. C. ^[1]; Kim, B. M. ^[2]; Jeong, C. K. ^[2]; Toyoshima, R. ^[3]; Kondoh, H. ^[3]; Shimada, T. ^[4]; Mase, K. ^[5]; Mao, B. ^[6]; Liu, Z. ^[6]; Lee, H. ^[7]; Huang, Chuan -Qi ^[8]; Li, W. X. ^[8]; Ross, P. N. ^[6]; Mun, B. S. ^[1]

Gwangju Institute of Science and Technology (Republic of Korea)
Hanyang Univ. (Republic of Korea)
Keio Univ., Tokyo (Japan)
Hirosaki Univ., Aomori (Japan)
High Energy Accelerator Research Org., Ibaraki (Japan)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sookmyung Women's Univ., Seoul (Republic of Korea)
Chinese Academy of Sciences, Dalian (China)

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. Finally, the DFT calculation is employed to explain the formation of surface oxides under oxidation condition.

Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); National Natural Science Foundation of China (NNSFC); National Research Foundation of Korea (NRF)

DOE Contract Number:: AC02-05CH11231

OSTI ID:: 1405292

Journal Information:: Catalysis Today, Journal Name: Catalysis Today Journal Issue: C Vol. 260; ISSN 0920-5861

Publisher:: Elsevier

Country of Publication:: United States

Language:: English

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References (26)

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