Jiang De-Hao, Yang Cheng-Hsien, Tseng Chuan-Ming, Lee Sheng-Long, Chang Jeng-Kuei
Institute of Materials Science and Engineering, National Central University, 300 Jhongda Road, Taoyuan, 32001, Taiwan.
Nanoscale. 2014 Nov 7;6(21):12565-72. doi: 10.1039/c4nr03357d.
With the aid of supercritical CO2, Fe-, Ni-, Pd-, and Au-nanoparticle-decorated nanostructured carbon materials (graphene, activated carbon, carbon black, and carbon nanotubes) are synthesized for catalyzing the dehydrogenation of LiAlH4. The effects of the metal nanoparticle size and distribution, and the type of carbon structure on the hydrogen release properties are investigated. The Fe/graphene nanocomposite, which consists of ∼2 nm Fe particles highly dispersed on graphene nanosheets, exhibits the highest catalytic performance. With this nanocomposite, the initial dehydrogenation temperature can be lowered (from ∼135 °C for pristine LiAlH4) to ∼40 °C without altering the reaction route (confirmed by in situ X-ray diffraction), and 4.5 wt% H2 can be released at 100 °C within 6 min, which is faster by more than 135-fold than the time required to release the same amount of H2 from pristine LiAlH4.
借助超临界二氧化碳，合成了负载铁、镍、钯和金纳米颗粒的纳米结构碳材料（石墨烯、活性炭、炭黑和碳纳米管），用于催化LiAlH₄的脱氢反应。研究了金属纳米颗粒尺寸和分布以及碳结构类型对氢释放性能的影响。由高度分散在石墨烯纳米片上的约2 nm铁颗粒组成的Fe/石墨烯纳米复合材料表现出最高的催化性能。使用这种纳米复合材料，初始脱氢温度可从原始LiAlH₄的约135℃降至约40℃，而不改变反应路径（原位X射线衍射证实），并且在100℃下6分钟内可释放4.5 wt%的H₂，这比从原始LiAlH₄释放相同量H₂所需的时间快135倍以上。
