A model for the delamination kinetics of La0.8Sr0.2MnO3oxygen electrodes of solid oxide electrolysis cells

Yanxiang Zhang, Kongfa Chen, Changrong Xia, San Ping Jiang, Meng Ni

Research output: Journal article publicationJournal articleAcademic researchpeer-review

26 Citations (Scopus)

Abstract

A theoretical model is developed to simulate the delamination kinetics of La0.8Sr0.2MnO3(LSM) electrode from YSZ electrolyte in solid oxide electrolysis cells (SOECs). The delamination is caused by the total stress including the internal oxygen pressure in LSM near the electrode/electrolyte interface, and the tensile stress by the oxygen migration from the YSZ electrolyte to LSM lattice. Weibull theory is used to determine the survival probability of electrode/electrolyte interface under the total stress. The relaxation time corresponding to the time for oxygen diffusion from the interface to the microcracks in La0.8Sr0.2MnO3links the survival probability with polarization time, thus the survival interface area can be predicted with varying anodic polarization time. The model is validated with experimental data. The effects of applied anodic current and operating temperature are discussed. The present model provides a starting point to study more complex cases, such as composite oxygen electrodes.
Original languageEnglish
Pages (from-to)13914-13920
Number of pages7
JournalInternational Journal of Hydrogen Energy
Volume37
Issue number19
DOIs
Publication statusPublished - 1 Oct 2012

Keywords

  • Degradation
  • Delamination
  • Model
  • Solid oxide electrochemical cells
  • Weibull theory

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Condensed Matter Physics
  • Energy Engineering and Power Technology

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