Experimental and computational investigations on the SO2 poisoning of (La0.8Sr0.2)0.95MnO3 cathode materials

doi:10.1016/j.apmate.2022.100062

Advanced Powder Materials

Volume 2, Issue 1, January 2023, 100062

https://doi.org/10.1016/j.apmate.2022.100062 Get rights and content

Under a Creative Commons license

open access

Abstract

To study the formation of detrimental phases under the sulfur gas impurity to the long-term degradation in the cathode material, the classic cathode material, (La_0.8Sr_0.2)_0.95MnO₃ (LSM), was prepared, sintered, and annealed at 800, 900, and 1000 °C in the sulfur-containing atmospheres, respectively. Through X-ray diffraction, scanning electron microscope, and transmission electron microscopy techniques, as well as the computer coupling of phase diagrams and thermochemistry methodology, the secondary phases, especially the detrimental ones, under different conditions were predicted and experimentally verified correspondingly. Furthermore, sulfur poisoning results indicate that the accelerated tests might have degradation mechanisms different from actual operation conditions. More importantly, comprehensive comparisons among various impurity-containing conditions were also made to recommend better operation parameters.

Graphical abstract

Keywords

LSM cathode

CALPHAD

Sulfur poisoning

Long-term degradation

Accelerated test

Cited by (0)

Rui Wang is a Ph. D. candidate in the Materials Science and Engineering program in the Mechanical and Materials Engineering Department, Worcester Polytechnic Institute. He received his B.S. in Powder Materials Science and Engineering from Central South University in 2015 and his M.S. in Materials Science and Engineering from Central South University in 2018. His research focuses on solid oxide cells with the help of both computational and experimental methods.

Lucas Parent is a Staff Research Scientist at the Innovation Partnership Building and the Center for Advanced Microscopy and Materials Analysis (CAMMA) at the University of Connecticut. He received his B.S. in Materials Science from Rensselaer Polytechnic Institute in 2009 and his Ph.D. in Materials Science from the University of California, Davis in 2013. His research focuses on developing in situ electron microscopy to study solution-phase materials synthesis and functional stimuli-response processes in organic and hybrid nanomaterials.

Prof. Srikanth Gopalan's research interests are in the areas of solid-state ionics with specific emphasis on fuel cells, electrolyzers, and batteries. He is particularly interested in understanding the role of surfaces and interfaces in facilitating electrochemical reactions and exploring novel solution processing methods to architect nanoscale heterostructures to maximize reaction rates in electrocatalysis.

Prof. Yu Zhong got his Ph.D. degree from Penn State University in 2005 and is currently an associate professor of mechanical and materials engineering at Worcester Polytechnic Institute (WPI). His research interests are in applying thermodynamics and kinetics in various applications, including solid oxide fuel cells and electrolyzers. He currently has more than 60 peer-reviewed journal papers published/accepted, two patents, and two book chapters.