期刊
JOURNAL OF POWER SOURCES
卷 326, 期 -, 页码 331-340出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2016.06.110
关键词
Solid oxide fuel cells; Chromium poisoning; Triple-phase boundary; Numerical simulation
资金
- New Energy and Industrial Technology Development Organization (NEDO) under Development of System and Elemental Technology for Solid OXide Fuel Cell (SOFC) Project
- Grants-in-Aid for Scientific Research [15H03930] Funding Source: KAKEN
A three-dimensional numerical model of a single solid oxide fuel cell (SOFC) considering chromium poisoning on the cathode side has been developed to investigate the evolution of the SOFC performance over long-term operation. The degradation model applied in the simulation describes the loss of the cathode electrochemical activity as a decrease in the active triple-phase boundary (TPB) length. The calculations are conducted for two types of cell: lanthanum strontium manganite (LSM)/yttria-stabilized zirconia (YSZ)/Ni-YSZ and LSM-YSZ/YSZ/Ni-YSZ. Their electrode microstructures are acquired by imaging with a focused ion beam scanning-electron microscope (FIB-SEM). The simulation results qualitatively reproduce the trends of chromium poisoning reported in the literature. It has been revealed that the performance degradation by chromium is primarily due to an increase in the cathode activation over potential. In addition, in the LSM-YSZ composite cathode, TPBs in the vicinity of the cathode electrolyte interface preferentially deteriorate, shifting the active reaction site towards the cathode surface. This also results in an increase in the cathode ohmic loss associated with oxide ion conduction through the YSZ phase. The effects of the cell temperature, the partial pressure of steam at the chromium source, the cathode microstructure, and the cathode thickness on chromium poisoning are also discussed. (C) 2016 Elsevier B.V. All rights reserved.
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