Assessing Substitution Effects on Surface Chemistry by in Situ Ambient Pressure X-ray Photoelectron Spectroscopy on Perovskite Thin Films, BaCexZr0.9-xY0.1O2.95 (x=0; 0.2; 0.9)

被引：26

作者：

Jarry, Angelique ^{[1
,2
,4
]}

Ricote, Sandrine ^{[5
]}

Geller, Aaron ^{[1
]}

Pellegrinelli, Christopher ^{[3
]}

Zhang, Xiaohang ^{[2
]}

Stewart, David ^{[2
]}

Takeuchi, Ichiro ^{[2
]}

Wachsman, Eric ^{[3
]}

Crumlin, Ethan J. ^{[4
]}

Eichhorn, Bryan ^{[1
]}

机构：

[1] Univ Maryland, Dept Chem & Biochem, College Pk, MD 20742 USA

[2] Univ Maryland, Dept Mat Sci & Engn, College Pk, MD 20742 USA

[3] Univ Maryland, Energy Res Ctr, College Pk, MD 20742 USA

[4] Lawrence Berkeley Natl Lab, Adv Light Source, Berkeley, CA 94720 USA

[5] Colorado Sch Mines, Mech Engn Dept, Golden, CO 80401 USA

来源：

ACS APPLIED MATERIALS & INTERFACES | 2018年 / 10卷 / 43期

关键词：

ambient pressure X-ray photoelectron spectroscopy; protonic ceramic fuel cells; perovskite; thin films; OXIDE FUEL-CELLS; DOPED BARIUM ZIRCONATE; OXYGEN REDUCTION ACTIVITY; PROTON-CONDUCTING OXIDES; TRANSPORT-PROPERTIES; SR SEGREGATION; METAL-OXIDES; WATER-VAPOR; TEMPERATURE; BAZRO3;

D O I：

10.1021/acsami.8b12546

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Performance of proton-solid oxide fuel cells (Fit SOFC) is governed by ion transport through solid/gas interfaces. Major breakthroughs are then intrinsically linked to a detailed understanding of how parameters tailoring bulk proton conductivity affect surface chemistry in situ, at an early stage. In this work, we studied proton and oxygen transport at the interface between H+-SOFC electrolyte BaCexZr0.9-x-Y0.1O2.95 (x = 0; 0.2; 0.9) thin films and the gas (100 mTorr of H2O and 02) by using synchrotron-based ambient pressure X-ray photoelectron spectroscopy at operating temperature (>400 degrees C). We developed highly textured BaCexZr0.9-xY0.1O2.95 epitaxial thin films, which exhibit high level of in-plane proton conductivity, that is, up to 0.08 S cm(-1) at 500 degrees C for x = 0.9. Upon applying 100 mTorr water partial pressure above 300 degrees C, major changes are observed only in the O 1s and Y 3d core level spectra, with a clear Zr/Ce ratio dependency. OH- formation is favored by Ce content while initiated near Y. Hydration is also associated with surface secondary phase growth comprising oxygen-under-coordinated yttrium and/or yttrium hydroxide. With BaCe0.2Zr0.7Y0.1O2.95, high levels of ionic conductivities and chemical stability are obtained as a result of the optimized surface reaction kinetics, with low activation energy barrier for proton transport while restraining formation of OH-/SO42- adsorb species.

引用

页码：37661 / 37670

页数：10

共 69 条

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