【摘要】 比较了各种后处理方法对湿法制备的硼化镍催化剂的化学、物理和电化学性能的影响,指出必须将硼化镍的制备过程与电极的制备过程统一起来考虑。在热处理过程中有控制地实现“冒烟”过程,可以得到能适应烧结式防水电极制备工艺的硼化镍。制得的电极电化学性能和工作寿命都比较好。更多还原

【Abstract】 Nickel boride catalyst is prepared by the reaction of KBH4 with Ni(Ⅱ) salt. Nickel boride samples prepared by different methods of after-treatment were characterized by chemical analysis, differential thermal analysis, X-ray diffraction and electrochemical tests. Experimental results indicated that catalyst samples of widely different boron content were oxidized almost at the same potential. However, in order to get more active catalyst for waterproofed electrode, the atomic ratio Ni/B of catalyst should be carefully controlled. It does not mean that the Ni/B ratio of the catalyst should be controlled at certain fixed value. We would only like to emphasize that, in order to get better results, the method of catalyst processing should be in accordance with the method of electrode fabrication. In other words, the optimal Ni/B ratio depends on the method of electrode fabrication. Some fuel cell anodes with nickel boride catalyst have been already running contineously at 50ma/cm2 for more than 3000 hours without serious deterioration.更多还原