The effect of grain size on the hydration of BaZr0.9Y0.1O3-δ proton conductor studied by ambient pressure X-ray photoelectron spectroscopy

Jarry, Angelique; Jackson, Gregory S.; Crumlin, Ethan J.; Eichhorn, Bryan; Ricote, Sandrine

doi:10.1039/c9cp04335g

The effect of grain size on the hydration of BaZr_0.9Y_0.1O_3-δ proton conductor studied by ambient pressure X-ray photoelectron spectroscopy

Journal Article · Mon Dec 02 23:00:00 EST 2019 · Physical Chemistry Chemical Physics. PCCP (Print)

DOI:https://doi.org/10.1039/c9cp04335g· OSTI ID:1767693

Jarry, Angelique ^[1]; Jackson, Gregory S. ^[2]; ^[3]; Eichhorn, Bryan ^[4]; ^[2]

Univ. of Maryland, College Park, MD (United States); OSTI
Colorado School of Mines, Golden, CO (United States)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
Univ. of Maryland, College Park, MD (United States)

Three BaZr_0.9Y_0.1O_3-δ (BZY10) pellets were prepared using different sintering processes, resulting in samples with different grain sizes, from 0.3 to 5 microns. Ambient pressure X-ray photoelectron spectra were recorded in argon, steam and oxygen atmospheres (100 mTorr) in the 300–500 °C temperature range. Deconvolution of O 1s peaks reveals 4 distinct contributions: sub-surface lattice oxide, termination layer oxides, OH^- and gas-phase steam in wet environments. The OH^- contribution of the O 1s peak includes sub-surface incorporation of protonic defects in the lattice related to hydration as well as surface hydroxylation and molecular water adsorption. The OH^- concentration increases with grain size and with decreasing the analysis depth. These results suggest that grain boundaries associated with the larger grains adsorbed water more effectively. Finally, larger grains, which increase proton conductivity in BZY10, may also enhance catalytic activity for carbonaceous fuel oxidation by facilitating increased hydration and surface carbon removal.

View Accepted Manuscript (DOE)

Research Organization:: Energy Frontier Research Centers (EFRC) (United States). Nanostructures for Electrical Energy Storage (NEES); Univ. of Maryland, College Park, MD (United States)

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

Grant/Contract Number:: SC0001160; AC02-05CH11231

OSTI ID:: 1767693

Alternate ID(s):: OSTI ID: 1775361
OSTI ID: 1576999

Journal Information:: Physical Chemistry Chemical Physics. PCCP (Print), Journal Name: Physical Chemistry Chemical Physics. PCCP (Print) Journal Issue: 1 Vol. 22; ISSN 1463-9076

Publisher:: Royal Society of ChemistryCopyright Statement

Country of Publication:: United States

Language:: English

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The effect of grain size on the hydration of BaZr0.9Y0.1O3-δ proton conductor studied by ambient pressure X-ray photoelectron spectroscopy

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The effect of grain size on the hydration of BaZr_0.9Y_0.1O_3-δ proton conductor studied by ambient pressure X-ray photoelectron spectroscopy