YSZ传导膜H_2S固体氧化物燃料电池

Performance of H_2S solid oxide fuel cell with yttria-stabilized zirconia conducting membrane

研究了Y2O3稳定的ZrO2(YSZ)氧离子传导膜H2S固体氧化物燃料电池性能。掺杂NiS、电解质、Ag粉和淀粉制备了双金属复合MoS2阳极催化剂,掺杂电解质、Ag粉和淀粉制备了复合NiO阴极催化剂,用扫描电镜对YSZ和膜电极组装(MEA)进行了表征,比较了不同电极催化剂的性能和极化过程,考察了不同温度对电池性能的影响。结果表明,双金属复合MoS2/NiS阳极催化剂在H2S环境下比Pt和单金属MoS2催化剂稳定,复合NiO阴极催化剂比Pt性能好,在电极催化剂中加入Ag可显著提高电极的导电性;与Pt电极相比,复合MoS2阳极和复合NiO阴极催化剂的过电位较小,阳极的极化比阴极侧小;温度升高,电池的电流密度与功率密度增加,电化学性能变好。在750℃、800℃、850℃和900℃及101.13 kPa时,结构为H2S、(复合MoS2阳极催化剂)/YSZ氧离子传导膜/(复合NiO阴极催化剂)、空气的燃料电池最大功率密度分别为30 mW/cm2、70 mW/cm2、155 mW/cm2及295 mW/cm2、最大电流密度分别为120 mA/cm2、240 mA/cm2、560 mA/cm2和890 mA/cm2。

The performance of H2S solid oxide fuel cell with yttria-stabilized zirconia（YSZ） oxygen ion-conducting membrane was investigated.The binary metal composite MoS2 anode catalysts（with doping NiS,electrolyte YSZ,Ag powder and starch）,the composite NiO cathode catalysts（with admixing electrolyte YSZ,Ag powder and starch）,and the membrane electrode assembly（MEA） were prepared.The YSZ and MEA were characterized by using scanning electron microscope（SEM）.The performance of several electrode catalysts was compared and the influence of operating temperature on the cell performance was examined.The results demonstrated that the binary metal composite MoS2/NiS anode catalysts work more stably than Pt and single metal MoS2 ones in H2S stream and the performance of composite NiO cathode catalysts is superior to that of Pt.The addition of Ag powder into the electrodes can significantly increase their electrical conductivity.The overpotentials of the composite MoS2 and NiO catalysts are smaller than that of Pt and the polarization of anode is smaller than that of cathode.With the increase of the cell temperature,the current and power densities are increased due to the elevation of the electrical conductivity of membrane and electrochemical reaction rate of fuel cell,which leads a better cell electrochemical performance.For the single fuel cell with the configuration of ＂H2S,（composite MoS2 anode）/YSZ membrane/（composite NiO cathode）,air＂ operated under 101.13kPa and the temperatures of 750℃,800℃,850℃ and 900℃,the maximum currents obtained are 120mA/cm2,240mA/cm2,560mA/cm2 and 890mA/cm2 and the power density are 30mW/cm2,70mW/cm2,155mW/cm2 and 295mW/cm2,respectively.