工程科学学报2016，Vol.38Issue(11)：1610-1619,10.DOI:10.13374/j.issn2095-9389.2016.11.015
碳基燃料气体组成和运行温度对固体氧化物燃料电池开路电压的影响
Effects of the compositions of carbon-base fuels and temperature on the open circuit voltage of solid oxide fuel cells
摘要
Abstract
The theoretical open circuit voltage ( OCV) of solid oxide fuel cells ( SOFCs) fed with carbon-based fuels and the amount of deposited carbon on the anode were calculated by the minimum Gibbs free energy method. The OCV values of Ni- YSZǁYSZǁLSM anode-supported cells using methane-based fuels were experimentally measured. The results indicate that the amount of deposited carbon decreases from the C-corner of the C-H-O diagram to the carbon deposition boundary at a constant rate. In the case that most of deposited carbon is electrochemically oxidized, feeding fuels with high C: H ratio can enhance the value of OCV;Conversely, fuels with low C:H ratio are suggested. Theoretical analysis shows the rapidly decreasing value of OCV near the OCV boundary ( OCV=0 V) . Experimental results also reveal that the value of OCV dramatically decreases when the volume fraction of CO2 in fuel gas increases to be higher than 80%. These results imply that the compositions of carbon-based fuels should be near the carbon deposition boundary in the C-H-O diagram, which is beneficial to suppress carbon deposition without significant OCV reduction. A relatively high value of OCV can be obtained at the H-corner in the non-carbon-deposition zone near the carbon deposition boundary, and the sequence of the value of OCV is CH4 >H2 >CO in the CO2-diluted ambiance at 600℃. Furthermore, the value of OCV can-not be significantly elevated via raising the proportion of external reforming or decreasing the temperature.关键词
固体氧化物燃料电池/热力学/甲烷/开路电压/积碳Key words
solid oxide fuel cells/thermodynamics/methane/open circuit voltage/carbon deposition分类
信息技术与安全科学引用本文复制引用
陈志远,王丽君,赵海雷,李福燊,周国治..碳基燃料气体组成和运行温度对固体氧化物燃料电池开路电压的影响[J].工程科学学报,2016,38(11):1610-1619,10.基金项目
国家重点基础研究发展计划资助项目(2012cB215405) （2012cB215405）
中国博士后科学基金资助项目(2015M570036) （2015M570036）
