Near-ambient pressure XPS of high-temperature surface chemistry in Sr2Co2O5 thin films

Hong, Wesley T.; Stoerzinger, Kelsey; Crumlin, Ethan J.; Mutoro, Eva; Jeen, Hyoung Jeen; Lee, Ho Nyung; Shao-Horn, Yang

doi:10.1007/s11244-015-0532-4

Title: Near-ambient pressure XPS of high-temperature surface chemistry in Sr2Co2O5 thin films

Journal Article · Thu Feb 11 00:00:00 EST 2016 · Topics in Catalysis

DOI:https://doi.org/10.1007/s11244-015-0532-4· OSTI ID:1261344

Hong, Wesley T. ^[1]; Stoerzinger, Kelsey ^[1]; Crumlin, Ethan J. ^[2]; Mutoro, Eva ^[1]; Jeen, Hyoung Jeen ^[3]; Lee, Ho Nyung ^[3]; Shao-Horn, Yang ^[1]

Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

© 2016 Springer Science+Business Media New York. Transition metal perovskite oxides are promising electrocatalysts for the oxygen reduction reaction (ORR) in fuel cells, but a lack of fundamental understanding of oxide surfaces impedes the rational design of novel catalysts with improved device efficiencies. In particular, understanding the surface chemistry of oxides is essential for controlling both catalytic activity and long-term stability. Thus, elucidating the physical nature of species on perovskite surfaces and their catalytic enhancement would generate new insights in developing oxide electrocatalysts. In this article, we perform near-ambient pressure XPS of model brownmillerite Sr 2 Co 2 O 5 (SCO) epitaxial thin films with different crystallographic orientations. Detailed analysis of the Co 2p spectra suggests that the films lose oxygen as a function of temperature. Moreover, deconvolution of the O 1s spectra shows distinct behavior for (114)-oriented SCO films compared to (001)-oriented SCO films, where an ad ditional bulk oxygen species is observed. These findings indicate a change to a perovskite-like oxygen chemistry that occurs more easily in (114) SCO than (001) SCO, likely due to the orientation of oxygen vacancy channels out-of-plane with respect to the film surface. This difference in surface chemistry is responsible for the anisotropy of the oxygen surface exchange coefficient of SCO and may contribute to the enhanced ORR kinetics of La 0.8 Sr 0.2 CoO 3-δ thin films by SCO surface particles observed previously.

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Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC05-00OR22725; AC02-05CH11231

OSTI ID:: 1261344

Alternate ID(s):: OSTI ID: 1379119

Journal Information:: Topics in Catalysis, Vol. 59, Issue 5; ISSN 1022-5528

Publisher:: SpringerCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 23 works

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Title: Near-ambient pressure XPS of high-temperature surface chemistry in Sr2Co2O5 thin films

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