|About this Abstract
||MS&T22: Materials Science & Technology
||Energy Materials for Sustainable Development
||Detection of Proton Incorporation and Diffusion in Electrolyte Materials for SOFCs
||Takuya Yamaguchi, Tomohiro Ishiyama, Haruo Kishimoto, Katherine Develos-Bagarinao, Katsuhiko Yamaji
|On-Site Speaker (Planned)
Hydrogen sometimes has a serious effect on the material properties, such as hydrogen embrittlement of metals and hydrogen passivation of semiconductors. Therefore, understanding its behavior is crucial to improve the performance of various devices. In solid oxide fuel cells (SOFCs), although the major carriers in electrolytes are oxide ions, it has been suggested that hydrogen is also incorporated into electrolytes from the atmospheric water vapor. The incorporated hydrogen exists as protons bound to lattice oxygen atoms and it possibly affect SOFC performance (e.g. cathode degradation), so understanding its behavior is also important for SOFCs. Recently, using Secondary ion mass spectrometry (SIMS), we have proposed the technique to quantitatively measure low concentration of protons. Applying the proposed technique to typical electrolyte materials, YSZ and GDC, the protons are found to be incorporated mainly into the grain boundaries. This finding is also supported by NanoSIMS imaging of proton distribution.