Author:
Bredikhin Ivan,Sinitsyn Vitaly,Aronin Alexander,Kuritsyna Irina,Bredikhin Sergey
Abstract
The microstructure and chemical changes in the Ni-YSZ heterojunctions were studied by scanning, transmission, and high-resolution electron microscopy and X-ray diffraction. It was shown that new nano-size Ni grains are formed at Ni-YSZ interface at the cell operation. The following two stage reaction mechanism was proposed for hydrogen oxidation on the nano-size Ni grains: 1. NiO + Н2 Þ Н2О + Ni; 2. O2-(YSZ) + Ni Þ NiO + 2e. This mechanism implies that the SOFC will operate during some time even after switching off the hydrogen flow. We have observed and investigated current-voltage characteristics of SOFC after cutting off the hydrogen pass through anode chamber. Electrochemical properties of SOFC were investigated as a function of Ni volume content for two different geometry of anode current collector. Good correlations of experimentally measured SOFC characteristics with results of numeric calculations were found.
Publisher
The Electrochemical Society
Cited by
10 articles.
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