MgH_2-MoS_2-PP复合材料的储氢性能（英文）

Hydrogen Storage Properties of MgH_2-MoS_2-Pyrolyzed Polyaniline Composite

通过球磨法制备了MgH_2-MoS_2-PP(PP=热解聚苯胺,wMoS_2=wPP=8.33%)复合材料。与纯MgH_2对比研究发现,复合材料的初始放氢温度从650 K下降到550 K,并且在573 K下,75 min内的放氢量从0.38%(w/w,下同)提高到2.36%。在423 K下,放氢后产物可在40 min内吸氢2.45%,比纯MgH_2高出2.13倍。放氢反应的活化能比纯MgH_2(101.83 kJ·mol^(-1))降低了28.81 kJ·mol^(-1)。MgH_2-MoS_2-PP复合材料的性能提高是由于PP能够均匀地减小Mg颗粒尺寸,并提高MoS_2在体系放氢与再吸氢过程中的催化效率。

A composite of MgH2-MoS2-PP （PP=pyrolyzed polyaniline, wMoS2=wPP=8.33%） was prepared by ball-milling. In comparison to pure MgH2, the onset decomposition temperature of the composite decreases from 650 to 550 K and the hydrogen desorption content increases from 0.38% to 2.36% （w/w, the same below） at 573 K within 75 min. The composite can absorb 2.45% H2 within 40 min, which is 2.13 times higher than that of the MgH2 at 423 K. The apparent activation energy of the composite is 101.83 kJ·mol-1, decreasing by 28.81 kJ·mol-1 compared to MgH2. The reason of superior hydrogen storage performance of the PP-MoS2-MgH2 composite is found to be that PP can effectively decrease the size of Mg particles and enhance the catalytic efficiency of MoS2 in the desorption-resorption cycling.