Tuning Surface Acidity of Mixed Conducting Electrodes: Recovery of Si–Induced Degradation of Oxygen Exchange Rate and Area Specific Resistance

Seo, Han Gil; Staerz, Anna; Kim, Dennis S.; LeBeau, James M.; Tuller, Harry L.

doi:10.1002/adma.202208182

Tuning Surface Acidity of Mixed Conducting Electrodes: Recovery of Si–Induced Degradation of Oxygen Exchange Rate and Area Specific Resistance

Journal Article · Sat Dec 03 00:00:00 EST 2022 · Advanced Materials

DOI:https://doi.org/10.1002/adma.202208182· OSTI ID:1905646

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Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)

Metal oxides are an important class of functional materials, and for many applications, ranging from solid oxide fuel/electrolysis cells, oxygen permeation membranes, and oxygen storage materials to gas sensors (semiconducting and electrolytic) and catalysts, the interaction between the surface and oxygen in the gas phase is central. Ubiquitous Si-impurities are known to impede this interaction, commonly attributed to the formation of glassy blocking layers on the surface. Here, the surface oxygen exchange coefficient (k_chem) is examined for Pr_0.1Ce_0.9O_2-δ (PCO), a model mixed ionic electronic conductor, via electrical conductivity relaxation measurements, and the area-specific resistance (ASR) by electrochemical impedance spectroscopy. It is demonstrated that even low silica levels, introduced by infiltration, depress k_chem by a factor 4000, while the ASR increases 40-fold and we attribute this to its acidity relative to that of PCO. The ability to fully regenerate the poisoned surface by the subsequent addition of basic Ca- or Li-species is further shown. Furthermore, this ability to not only recover Si-poisoned surfaces by tuning the relative surface acidity of an oxide surface, but subsequently outperform the pre-poisoned response, promises to extend the operating life of materials and devices for which the catalytic oxygen/solid interface reaction is central.

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Research Organization:: Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)

Sponsoring Organization:: USDOE Office of Fossil Energy (FE); National Research Foundation of Korea (NRF); Ministry of Education Fellowship; US Air Force Office of Scientific Research (AFOSR); MIT Department of Materials Science and Engineering; USDOE

Grant/Contract Number:: FE0031668

OSTI ID:: 1905646

Alternate ID(s):: OSTI ID: 1905648; OSTI ID: 1908559

Journal Information:: Advanced Materials, Vol. 35, Issue 8; ISSN 0935-9648

Publisher:: WileyCopyright Statement

Country of Publication:: United States

Language:: English

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Tuning Surface Acidity of Mixed Conducting Electrodes: Recovery of Si–Induced Degradation of Oxygen Exchange Rate and Area Specific Resistance

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References (54)

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