Mechanism of chromium poisoning the conventional cathode material for solid oxide fuel cells

Research output: Contribution to journalArticle

Abstract

Chromium poisoning the La0.875Sr0.125MnO3 (LSM) cathode for solid oxide fuel cells is a critical issue that can strongly affect the stability. In this study, we evaluate the temperature distribution in a SOFC based on a 3D model and then combine conductivity test and material computation to reveal the effects of chromium in SUS430 stainless steels on LSM conductivities. The starch concentration in LSM pellets and the applied pressure on the contact with interconnect materials show close relationships with the chromium poisoning behavior. The density functional theory (DFT) computing results indicate that chromium atoms preferably adsorb on the MnO2-terminated and La (Sr)-O-terminated (001) surfaces. The resulting conclusions are expected to deeply understand mechanism of chromium deactivating conventional cathodes at some typical operational conditions, and offer crucial information to optimize the structure to avoid the poisoning effect.

Details

Authors
  • Xiaoqiang Zhang
  • Guangsen Yu
  • Shumao Zeng
  • Joseph Parbey
  • Shuhao Xiao
  • Baihai Li
  • Tingshuai Li
  • Martin Andersson
Organisations
External organisations
  • University of Electronic Science and Technology of China
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Energy Engineering

Keywords

  • Chromium, Conductivity, Poisoning, Solid oxide fuel cell
Original languageEnglish
Pages (from-to)26-29
Number of pages4
JournalJournal of Power Sources
Volume381
Publication statusPublished - 2018 Mar 31
Publication categoryResearch
Peer-reviewedYes