Tang F, Parker T, Li H-F, Wang G-C, Lu T-M
Nanotechnology. 2008 Nov 19;19(46):465706. doi: 10.1088/0957-4484/19/46/465706. Epub 2008 Oct 22.
We present hydrogenation/de-hydrogenation properties of ultrathin Mg nanoblades coated with Pd as a catalyst. The hydrided Pd/Mg/Pd and Pd/Mg nanoblades were highly curved as observed by ex situ scanning electron microscopy. An in situ thermal desorption spectroscopy (TDS) study showed that the hydrided Pd/Mg/Pd nanostructure has a low hydrogen desorption temperature, at ∼365 K. Through a combinational microstructure and TDS analysis of hydrided Pd/Mg/Pd nanoblades as well as hydrided Pd/Mg/Pd nanoblades covered with an additional ultrathin Mg layer, we found that the effect of Pd catalyst on reducing the hydrogen desorption temperature is significantly stronger than the conventionally proposed mechanisms due to grain size and strain.
我们展示了涂覆有作为催化剂的钯的超薄镁纳米刀片的氢化/脱氢特性。通过非原位扫描电子显微镜观察发现，氢化后的Pd/Mg/Pd和Pd/Mg纳米刀片高度弯曲。原位热脱附光谱（TDS）研究表明，氢化后的Pd/Mg/Pd纳米结构具有较低的氢脱附温度，约为365 K。通过对氢化后的Pd/Mg/Pd纳米刀片以及覆盖有额外超薄镁层的氢化后的Pd/Mg/Pd纳米刀片进行微观结构和TDS分析，我们发现钯催化剂对降低氢脱附温度的作用明显强于传统提出的由于晶粒尺寸和应变引起的机制。
