【摘要】 将95%Mg+3%Ni+2%MnO2混合粉末在行星式高能球磨机中充氢反应球磨100 h,利用X射线衍射(XRD)和扫描电镜(SEM)对球磨后的粉体进行表征,并研究其与水反应的动力学性能。结果表明,充氢球磨能对Mg-3Ni-2MnO2进行充分的氢化,Mg全部形成MgH2。制备的氢化态Mg-3Ni-2MnO2复合粉末的颗粒尺寸为0.1～5μm,晶粒尺寸在1～40 nm之间。复合物在二次去离子水中水解时,随温度升高,放氢量增加,当温度为343 K时,在20 min内放出的氢气达到理论放氢量的91.3%,有望成为1种新的安全高效氢源技术。Avrami指数的数值变化表明,氢化态Mg-3Ni-2MnO2复合粉体的水解过程中,不同阶段其水解机理有所不同。更多还原

【Abstract】 95% Mg+3% Ni+2%MnO2(Mg-3Ni-2MnO2) composite powders were milled under hydrogen atmosphere by high-energy planetary ball mill for 100 h,and characterized by X-ray diffraction(XRD) and scanning electron microscope(SEM),and the hydrolysis kinetics of the composites were investigated.It showed that the Mg-3Ni-2MnO2 could be fully hydrogenated and the Mg formed MgH2 completely.The measured particle sizes are in the range of 0.1～5 μm,while their grain sizes are in the range of 1～40 nm estimated theoretically.The desorption volume of hydrogen could be increased by increasing the reaction temperature.The hydrogen up to 91.3% of desorption capacity of the composites is released within 20 min from the hydrogenated composites in the second deionized water at 343 K.-It promises to be a new technology of hydrogen sources with safety and high efficiency.The Avrami index values change stage suggested that the reaction mechanisms for the hydrided Mg-3Ni-2MnO2 composite powders were different in different temperature through the process of reaction with water.更多还原