Analysis of gas products from direct utilization of carbon in a solid oxide fuel cell

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• 作者：Tritti Siengchum^a ; Felipe Guzman^b ; Steven S.C. Chuang^b ; ^{schuang@uakron.edu}
• 关键词：SOFC ; Carbon fuel cell ; Thermodynamic calculation ; Infrared spectroscopy ; CO fuel ; Boudouard reaction
• 刊名：Journal of Power Sources
• 出版年：2012
• 期刊代码：58_03787753
• 类别：ce
• 出版时间：1 September, 2012
• 卷：213
• 期：Complete
• 页码：375-381
• 文件大小：1694 K

摘要

The evolution of gases from direct utilization of carbon in a solid oxide fuel cell (C-SOFC) was studied by potentiostatic/galvanostatic discharge of a fuel cell with coconut carbon, a carbonaceous material with low ash and sulfur content. Operation of C-SOFC at 750聽掳C produced less CO and more CO₂ than those predicted by thermodynamic calculation using total Gibbs free energy minimization method. The addition of CO₂ to the anode chamber increased CO formation and maximum power density from 0.09聽W聽cm^鈭? to 0.13聽W聽cm^鈭?, indicating the occurrence of Boudouard reaction (CO₂聽+聽C聽鈬斅?CO) coupling with CO electrochemical oxidation on the C-SOFC. Analysis of CO and CO₂ concentration as a function of current and voltage revealed that electricity was mainly produced from the electrochemical oxidation of carbon at low current density and produced from the electrochemical oxidation of CO at high current density. The results suggest the electrochemical oxidation of solid carbon is more mass transfer limited than electrochemical oxidation of CO.