双金属片
氢气储存
氢化镁
材料科学
化学工程
催化作用
纳米复合材料
氢化物
镁
氢
薄膜
解吸
动力学
无机化学
冶金
合金
化学
吸附
纳米技术
物理化学
金属
有机化学
工程类
物理
量子力学
作者
Beniamin Zahiri,Babak Shalchi Amirkhiz,David Mitlin
摘要
We examine hydrogen sorption cycling of 1.5 μm thick magnesium thin films containing a bimetallic chromium titanium catalyst. At 200 °C these nanocomposites absorb 5 wt % hydrogen in several seconds, and desorb in 10–20 minutes. In several compositions, there is negligible hydrogenation kinetics or capacity degradation even at over 100 cycles. Equally importantly, the ternary films require minimal activation, achieving rapid magnesium hydride formation and decomposition from cycle one. Pressure-composition isotherms display well-known enthalpies of MgH2. Transmission electron microscopy analysis supports a hypothesis that such extreme kinetics is due to the presence of a nanodispersed Cr Ti phase in Mg matrix.
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