An effective strategy to enhancing tolerance to contaminants poisoning of solid oxide fuel cell cathodes

Chen, Yu; Yoo, Seonyoung; Li, Xiaxi; Ding, Dong; Pei, Kai; Chen, Dongchang; Ding, Yong; Zhao, Bote; Murphy, Ryan; deGlee, Ben; Liu, Jiang; Liu, Meilin

doi:10.1016/j.nanoen.2018.03.043

Title: An effective strategy to enhancing tolerance to contaminants poisoning of solid oxide fuel cell cathodes

Journal Article · Thu Mar 15 00:00:00 EDT 2018 · Nano Energy

DOI:https://doi.org/10.1016/j.nanoen.2018.03.043· OSTI ID:1538633

Chen, Yu ^[1]; Yoo, Seonyoung ^[1]; Li, Xiaxi ^[1]; Ding, Dong ^[1]; Pei, Kai ^[1]; Chen, Dongchang ^[1]; Ding, Yong ^[1]; Zhao, Bote ^[1]; Murphy, Ryan ^[1]; deGlee, Ben ^[1]; Liu, Jiang ^[2]; Liu, Meilin ^[1]

Georgia Institute of Technology, Atlanta, GA (United States)
South China University of Technology (SCUT), Guangzhou (China)

Commercialization of solid oxide fuel cells (SOFCs) is impeded by severe cathode degradation from the poisoning effect of contaminants commonly encountered in air (such as H₂O and CO₂) and from other cell components (e.g., Cr species from chromium-containing interconnector). Here we report our findings in unraveling the mechanism of Cr poisoning of La_.6Sr_.4Co_.2Fe_.8O₃ (LSCF) cathodes using our unique in situ/operando surface enhanced Raman spectroscopy. Further, we present an effective strategy to enhancing the tolerance to contaminants poisoning of LSCF cathode through infiltration of a hybrid catalyst coating, which is composed of a conformal film of perovskite PrNi_.5Mn_.5O₃ (PNM) and exsoluted PrO_x nano-particles. The coating is catalytically active to oxygen reduction reaction but inert to contaminant poisoning. When subjected to an accelerated Cr-poisoning test, the cells with a hybrid catalyst-coated LSCF cathode show excellent peak power density (P_max of 0.71 Wcm^-2) and significantly enhanced durability (degradation rate of 0.0434% h^-1 at 0.7 V), much better than those of cells with a bare LSCF cathode (P_max of ~0.46 Wcm^-2 and degradation rate of 0.4% h^-1 at 0.7 V). The results suggest that surface modification of electrodes with a coating of rationally designed catalysts is a cost-effective approach to dramatically reducing electrode degradation caused by contaminations.

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Research Organization:: Georgia Institute of Technology, Atlanta, GA (United States)

Sponsoring Organization:: USDOE Advanced Research Projects Agency - Energy (ARPA-E)

Grant/Contract Number:: AR0000502; FE0009652; FE0026106

OSTI ID:: 1538633

Alternate ID(s):: OSTI ID: 1582823

Journal Information:: Nano Energy, Vol. 47, Issue C; ISSN 2211-2855

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 60 works

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