Issue 36, 2024

Heterostructured electrodes for Cr-tolerant solid oxide fuel cells

Abstract

Cr poisoning at the surface of Sr-doped perovskite oxides significantly reduces the durability of solid oxide fuel cells during stack operation under practical atmospheres. This poisoning is attributed to the interactions between vaporized Cr and segregated Sr at the surface, facilitated by the electrostatic interaction of oxygen vacancies and doped Sr. To address this issue, we designed a heterostructured electrode coated with a Cr-tolerant Sr-free material, which exhibits a low oxygen-vacancy concentration and contains reducible sites, preventing direct contact between vaporized Cr and Sr. By redistributing the charged defects near the heterointerface, excessive oxygen vacancies in the bulk electrode are reduced, leading to suppressed Sr segregation and Cr poisoning. Evaluation of thin-film model electrodes reveals significantly improved stability of the heterostructured electrode in both ambient air and a Cr atmosphere at 600 °C for 100 h as well as its enhanced oxygen reduction reaction kinetics. Furthermore, we demonstrate the feasibility of using this approach to fabricate a porous electrode, exhibiting high performance and high stability with nearly no degradation at 600 °C for 300 h. This paper presents a rational design strategy for Cr-tolerant hetero-structured electrodes, particularly based on Sr-doped perovskite oxides, considering physical, chemical, and electrochemical stabilities and performances.

Graphical abstract: Heterostructured electrodes for Cr-tolerant solid oxide fuel cells

Supplementary files

Article information

Article type
Paper
Submitted
18 jun 2024
Accepted
05 aug 2024
First published
16 aug 2024

J. Mater. Chem. A, 2024,12, 24103-24113

Heterostructured electrodes for Cr-tolerant solid oxide fuel cells

S. Bang, J. Lee, J. G. Kim, J. Kim, M. Choi, Y. Chen and W. Lee, J. Mater. Chem. A, 2024, 12, 24103 DOI: 10.1039/D4TA04215H

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements