He Yuping, Zhao Yiping
Department of Physics and Astronomy, and Nanoscale Science and Engineering Center, University of Georgia, Athens, GA 30602, USA.
Phys Chem Chem Phys. 2009 Jan 14;11(2):255-8. doi: 10.1039/b815924f. Epub 2008 Nov 18.
An ultra-thin layer of V has been coated onto the surface of individual Mg nanoblades by dynamic shadowing growth. This 2.25 at% V decorated Mg nanoblade array can absorb and desorb hydrogen rapidly at temperatures T>or= 500 K after activation by one hydrogen cycle, with a low hydrogen absorption activation energy of 35.0+/-1.2 kJ per mol H(2) and a desorption activation energy of 65.0+/-0.3 kJ per mol H(2). The improved hydrogen sorption kinetics is attributed to both the catalytic effect of the V coating and the unique nanoblade morphology with a large surface area and small hydrogen diffusion length.
通过动态阴影生长法，在单个镁纳米刀片表面涂覆了一层超薄的钒。在经过一个氢循环活化后，这种含2.25原子百分比钒的修饰镁纳米刀片阵列在温度T≥500K时能够快速吸收和解吸氢气，其氢吸收活化能低至35.0±1.2kJ/mol H₂，解吸活化能为65.0±0.3kJ/mol H₂。氢吸附动力学的改善归因于钒涂层的催化作用以及具有大表面积和小氢扩散长度的独特纳米刀片形态。
