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《Journal of Engineering for Thermal Energy and Power》 2007-04
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An Experimental Study of Direct Carbon Fuel Cells (DCFC)

CHEN Hong-wei,WANG Jin-quan,GAO Jian-qiang,et al (College of Energy Source and Power Engineering under the North China University of Electric Power,Baoding,China,Post Code: 071003)  
Direct carbon fuel cells (DCFC) represent an effective and clean fuel-cell technology,which is based on the theory of producing electric energy directly through an electrochemical reaction of carbon and oxygen with no need for gasification and reforming.Its efficiency can be as high as 80% and fuel utilization rate can reach about 100%.A single-body cell of DCFC was assembled with its working temperature ranging from 500 to 700 ℃.The cell uses fusible hydroxide to serve as an electrolyte with a certain amount of catalyst being added.Graphite is used to serve as a positive pole and stainless steel as a negative one with moistened oxygen being added to serve as an oxidation agent.An experimental study has been performed of the output performance of DCFC by using different electrolytes and at different oxygen flow rates.The results of the study show that KOH has a better conductivity than NaOH and the cell made from KOH can operate more stably and is more favorable for cell output.When the oxygen flow rate is 70 ml/min,the cell has an optimum output performance with its maximal current and power density being 105 mA/cm2 and 0.041 W/cm2 respectively.The open-circuit voltage can reach 0.74 V.When the current density is 45 mA/cm2,the output voltage can reach 0.65 V and the cell can maintain a continuous and stable operation for 20 hours.A pyrolysis and direct carbon fuel-cell combined system is proposed and with C10H22 serving as an example,an analysis was performed of the combined system having a maximal power generation efficiency of 76.5%.This indicates that the system in question will have a brilliant application prospect in future centralized power plants.
【CateGory Index】: TM911.4
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