固体氧化物燃料电池直接以焦炭为燃料的电性能

直接碳固体氧化物燃料电池（DC-SOFC）是一种潜在的固体碳燃料高效率、低污染发电技术。本研究报道了将工业焦炭直接用作管式DC-SOFC燃料的研究。制备了电极材料为Ag-GDC （钆掺杂氧化铈）的YSZ （钇稳定化氧化锆）电解质支撑型管式固体氧化物燃料电池（SOFC）。采用拉曼光谱、扫描电镜和X射线能谱仪对焦炭燃料进行了性质表征。结果表明，焦炭燃料呈微米级的颗粒状，并含有大量对Boudouard反应有利的缺陷结构。电池以纯焦炭为燃料在850℃取得的最大功率密度为149mW/cm²，在碳燃料表面负载能提高Boudouard反应速率的Fe催化剂后，最大功率密度提高至217mW/cm²。通过电化学测试和尾气表征，分析了恒电流放电过程中电池的性能衰减机制。测试结果证明了将焦炭直接用作全固态DC-SOFC的燃料产生电能的可行性。

Direct use of coke in a solid oxide fuel cell

Direct carbon solid oxide fuel cell (DC-SOFC) is a potential technology for generating electricity from solid carbon fuel with high conversion efficiency and low pollution. In this study, the use of industrial coke as a fuel for a direct carbon solid oxide fuel cell (DC-SOFC) was investigated. Tubular yttrium-stabilized zirconia (YSZ) electrolyte-supported solid oxide fuel cells (SOFCs) with a cermet of silver and gadolinium-doped ceria (Ag-GDC) as electrode material were fabricated. Raman spectroscopy, scanning electron microscopy and energy dispersive X-ray spectroscopy were applied to characterize the investigated coke fuels. It was observed that the coke fuel wa micron-sized particles with many structural defects, which favored the Boudouard reaction occurring in a DC-SOFC. A peak power density of 149 mW/cm² at 850 ℃ was observed for pure coke fuel, and it improved to 217 mW/cm² when a Fe-based catalyst was added to enhance the Boudouard reaction. The degradation performance of the DC-SOFC during a discharging test was analyzed according to the electrochemical characterization and emitted gas measurements. The performed test supported the feasibility of using coke as fuel in an all-solid-state DC-SOFC to generate electricity.