Thermodynamic Analysis of Methane-fueled Solid Oxide Fuel Cells Considering CO Electrochemical Oxidation

doi:10.1016/j.cjche.2014.06.018

Abstract

Abstract: Thermodynamic analyses in the literature have shown that solid oxide fuel cells (SOFCs)with proton conducting electrolyte (H-SOFC) exhibited higher performance than SOFCwith oxygen ion conducting electrolyte (O-SOFC). However, these studies only consider H₂ electrochemical oxidation and totally neglect the contribution of CO electrochemical oxidation in O-SOFC. In this short communication, a thermodynamic model is developed to compare the theoretically maximum efficiencies of H-SOFC and O-SOFC, considering the electrochemical oxidation of CO in O-SOFC anode. It is found that O-SOFC exhibits a higher maximum efficiency than H-SOFC due to the contribution from CO electrochemical oxidation, which is contrary to the common understanding of electrolyte effect on SOFC performance. The effects of operating temperature and fuel utilization factor on the theoretical efficiency of SOFC are also analyzed and discussed.

Key words: Solid oxide fuel cell, Thermodynamics, Proton conductor, Oxygen ion conductor, Hydrocarbon fuels

摘要： Thermodynamic analyses in the literature have shown that solid oxide fuel cells (SOFCs)with proton conducting electrolyte (H-SOFC) exhibited higher performance than SOFCwith oxygen ion conducting electrolyte (O-SOFC). However, these studies only consider H₂ electrochemical oxidation and totally neglect the contribution of CO electrochemical oxidation in O-SOFC. In this short communication, a thermodynamic model is developed to compare the theoretically maximum efficiencies of H-SOFC and O-SOFC, considering the electrochemical oxidation of CO in O-SOFC anode. It is found that O-SOFC exhibits a higher maximum efficiency than H-SOFC due to the contribution from CO electrochemical oxidation, which is contrary to the common understanding of electrolyte effect on SOFC performance. The effects of operating temperature and fuel utilization factor on the theoretical efficiency of SOFC are also analyzed and discussed.

关键词: Solid oxide fuel cell, Thermodynamics, Proton conductor, Oxygen ion conductor, Hydrocarbon fuels

Qiong Sun, Keqing Zheng, Meng Ni. Thermodynamic Analysis of Methane-fueled Solid Oxide Fuel Cells Considering CO Electrochemical Oxidation[J]. , 2014, 22(9): 1033-1037.

References

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