Issue 31, 2020

How an angstrom-thick oxide overcoat enhances durability and activity of nanoparticle-decorated cathodes in solid oxide fuel cells

Abstract

In this report, we demonstrate that a uniform angstrom-level oxide overcoat (either ceria or yttria with a nominal thickness of 0.7–1.5 Å) by atomic layer deposition is highly effective not only in enhancing the thermal stability of underlying infiltrated ceria nanoparticles but also in facilitating electrode kinetics. By employing Sr-free electrodes and Cr-free gas environment, we focus on the thermal agglomeration as the major degradation pathway and reveal the close correlation between thermal agglomeration rate of infiltrated nanoparticles and degradation rate of electrode performance in a quantitative manner. We also provide a mechanistic perspective on the beneficial effect of the overcoat in durability and performance of solid oxide fuel cell cathodes.

Graphical abstract: How an angstrom-thick oxide overcoat enhances durability and activity of nanoparticle-decorated cathodes in solid oxide fuel cells

Supplementary files

Article information

Article type
Paper
Submitted
13 Mrz 2020
Accepted
22 Mai 2020
First published
22 Mai 2020

J. Mater. Chem. A, 2020,8, 15927-15935

Author version available

How an angstrom-thick oxide overcoat enhances durability and activity of nanoparticle-decorated cathodes in solid oxide fuel cells

H. Li, H. Kang, S. Grewal, A. J. Nelson, S. A. Song and M. H. Lee, J. Mater. Chem. A, 2020, 8, 15927 DOI: 10.1039/D0TA02915G

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