Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5146952 | International Journal of Hydrogen Energy | 2017 | 7 Pages |
Abstract
H2CO mixtures were fed to anode-supported solid oxide fuel cell (SOFC) Ni-YSZ/YSZ/GDC/BSCF to investigate the cell electrochemical performance and carbon deposition on the anode. Reasonable power density (â¼0.8Â WÂ cmâ2) was achieved with different H2CO ratios as fuels. By analyzing the electrochemical impedance spectroscopy (EIS) data, it was found that the medium frequency resistance increased with the increasing CO content, which indicated it was most likely associated with the anode charge transfer process. When ratio of H2:CO was around 2, CO mainly participates in the water gas shift reaction; and with the increasing CO content in the mixtures, CO also partly was involved in electrochemical oxidation. The cells could operate stably for all H2CO mixtures about 10Â h without failure at a constant current of 50Â mAÂ cmâ2. After the cells were tested, no carbon deposition was observed for the pure CO case, but with the presence of H2, carbon was observed. This phenomenon proves that the presence of H2 in H2CO mixtures promotes carbon deposition of CO. We firstly explored the carbon deposition area and found that carbon formation occurred only on the anode surface, which might be mainly caused by CO reduction reaction due to shifting the reaction equilibrium towards reverse syngas formation.
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Authors
Liu Zhen Bian, Zhi Yuan Chen, Li Jun Wang, Fu Shen Li, Kuo Chih Chou,