本研究利用熔煉法製備Mg-23.5wt.%Ni共晶合金，再利用球磨法合成含有經無電鍍鎳處理之5wt.%多壁奈米碳管(Electorless Nickel Multi Wall Carbon Nanotubes，EN-MWCNT )之複合儲氫材料，並藉由PCI及DSC測試，研究無電鍍鎳多壁奈米碳管對Mg-23.5wt.%Ni共晶合金儲放氫特性之影響。 研究中發現，無電鍍處理可將鎳析鍍於多壁奈米碳管上，其析鍍金屬顆粒大小為奈米等級，由於經無電鍍鎳處理之多壁奈米碳管具有移轉效應(spillover effect)，其吸氫效果比未經無電鍍鎳處理之多壁奈米碳管佳，移轉效應可降低氫分子分解成氫原子所需的動能，並提供氫原子有利接觸合金之通道，加速氫化反應。球磨法亦可於多壁奈米碳管上生成缺陷提高其表面能，加強物理吸附能力。藉由添加無電鍍鎳多壁奈米碳管可改善Mg-23.5wt.%Ni共晶合金於低溫下之吸氫反應，於160℃與100℃下分別有4.39wt.%及4.22 wt.%的儲氫量。由DSC測試曲線得知，鑄態Mg-23.5wt.%Ni共晶合金添加無電鍍鎳多壁奈米碳管之MgH2放氫起始溫度(onset temperature)為363℃，相較於純鎂之放氫起始溫度408℃降低約45℃，但對於降低Mg2NiH4放氫起始溫度沒有明顯效果。 Mg-23.5wt.%Ni eutectic alloy were prepared by traditional melting and mixed with 5wt.% electorless nickel multi-wall carbon nanotubes by high energy ball milling for 5h，and we studied the effect of electroless nickel multi-wall carbon nanotubes on the hydrogen storage properties of Mg-23.5wt.%Ni eutectic alloy by PCI and DSC. The experimental results show that electroless platting can get uniformly distributed nanoparticles on the surface of multi-wall carbon nanotubes which provied a spillover effect，thease reaction acceleration the dissociation of hydrogen molecules and improved the hydrogen storage properties at lower temperatures，the activated Mg-23.5wt.%Ni+5wt.%EN-MWCNT absorbed 4.22wt.% H2 and 4.39wt.% H2 at 100℃and160℃ for 60 min under 40 atm H2，the amount of dehydriding of the sample are nearly zero at 250℃. The DSC curves reveal endothermic peaks associated with hydride decomposition，the onset temperature of MgH2 is 363 ℃for the sample containing 5wt.% EN-MWCNT，which is lower than for the Mg sample(408 ℃) .
