LiFeO_2包覆MCFC氧化镍阴极的制备及性能研究

Preparation and Performance of LiFeO_2 Coated Nickel Oxide Cathode for Molten Carbonate Fuel Cells

以硝酸锂和硝酸铁为原料 ,柠檬酸作燃料 ,采用燃烧合成法制备了铁酸锂包覆的多孔氧化镍阴极 .X_射线衍射技术 (XRD)、X_射线能量散射谱 (EDAX)和电子显微镜 (TEM和SEM )分析表明 ,在氧化镍颗粒表面的包覆层是由直径小于 10 0nm的铁酸锂微粒所构成 ,并与氧化镍颗粒紧密烧结在一起 ,有效地减少了氧化镍与熔融碳酸盐的接触面积 ,从而降低了氧化镍的溶解度 .同时 ,本文还研究了该阴极在熔融碳酸盐燃料电池中的电性能 。

A novel cathode for molten carbonate fuel cells was prepared by coating LiFeO 2 over the surface of porous NiO cathode by a simple combustion process. The analytical results of X-ray diffraction (XRD), energy dispersive analysis of X-ray (EDAX), scanning electron microscopy (SEM) and transmission electron microscopy (TEM) indicated that the LiFeO 2 coating on the surface of NiO particles consisted of nonometer-sized LiFeO 2 grains and sintered tightly with the NiO particles. The LiFeO 2 coating dramatically reduced the contacting area of NiO with the carbonate melts, thus the solubility of NiO in the carbonate melts was decreased. Meanwhile, the performance of this novel cathode was cited and compared with the uncoated NiO cathode in molten carbonate fuel cells.