充氢反应球磨法制备氢化态Mg-3Ni-2MnO2复合物的水反应制氢性能

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...

Hydrolysis of hydrided Mg-3Ni-2MnO2 composites prepared by ball milling for hydrogen production

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.