Orientation-dependent hydration structures at yttria-stabilized cubic zirconia surfaces

Journal Article · Wed Nov 30 00:00:00 EST 2016 · Journal of Physical Chemistry. C

DOI:https://doi.org/10.1021/acs.jpcc.6b07550· OSTI ID:1352515

Hou, Binyang  ^[1]; Kim, Seunghyun ^[2]; Kim, Taeho ^[2]; Park, Changyong  ^[1]; Bahn, Chi Bum ^[3]; Kim, Jongjin ^[4]; Hong, Seungbum  ^[5]; Lee, Su Yong ^[6]; Kim, Ji Hyun  ^[2]

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1. Carnegie Inst. of Washington, Argonne, IL (United States)
2. Ulsan National Institute of Science and Technology, Ulsan (South Korea)
3. Pusan National Univ., Busan (South Korea)
4. Argonne National Lab. (ANL), Argonne, IL (United States)
5. Argonne National Lab. (ANL), Argonne, IL (United States); KAIST, Daejeon (South Korea)
6. Pohang Accelerator Lab., Pohang (South Korea)

Water interaction with surfaces is very important and plays key roles in many natural and technological processes. Because the experimental challenges that arise when studying the interaction water with specific crystalline surfaces, most studies on metal oxides have focused on powder samples, which averaged the interaction over different crystalline surfaces. As a result, studies on the crystal orientation-dependent interaction of water with metal oxides are rarely available in the literature. In this work, water adsorption at 8 mol % yttria-stabilized cubic single crystal zirconia (100) and (111) surfaces was studied in terms of interfacial hydration structures using high resolution X-ray reflectivity measurements. The interfacial electron density profiles derived from the structure factor analysis of the measured data show the existence of multiple layers of adsorbed water with additional peculiar metal adsorption near the oxide surfaces.Surface relaxation, depletion, and interaction between the adsorbed layers and bulk water are found to vary greatly between the two surfaces and are also different when compared to the previously studied (110) surface. The fractional ratio between chemisorbed and physisorbed water species were also quantitatively estimated, which turned out to vary dramatically from surface to surface. Finally, the result gives us a unique opportunity to reconsider the simplified 2:1 relation between chemisorption and physisorption, originally proposed by Morimoto et al. based on the adsorption isotherms of water on powder metal oxide samples.

• Research Organization: Argonne National Lab. (ANL), Argonne, IL (United States)
• Sponsoring Organization: USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE National Nuclear Security Administration (NNSA)
• Grant/Contract Number: AC02-06CH11357
• OSTI ID: 1352515
• Journal Information: Journal of Physical Chemistry. C, Vol. 120, Issue 51; ISSN 1932-7447
• Publisher: American Chemical Society
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
36 MATERIALS SCIENCE