High-Pressure Hydrogen Storage in Zeolite-Templated Carbon
High-Pressure Hydrogen Storage in Zeolite-Templated Carbon
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DOI：
10.1021/jp808890x
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发表时间：
2009-02-26
影响因子：
3.7
通讯作者：
Kyotani, Takashi
中科院分区：
文献类型：
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作者：
Nishihara, Hirotomo;Hou, Peng-Xiang;Kyotani, Takashi
在室温（30℃）条件下，研究了沸石模板炭（ZTC）的高压储氢。制备了几种不同比表面积的ZTC和一种氮掺杂ZTC。对其室温储氢性能进行了测试，并与工业活性炭的储氢性能进行了比较。在低于10 MPa的压力下，活性炭的吸氢能力与碳的比表面积成正比，ztc和活性炭的吸附热几乎相同（6近似于8 kJ mol(-1)）。另一方面，在压力大于10 MPa时，直径为1.2 nm的均匀微孔比比表面积对ztc的容量增加作用更大。结果表明，在34 MPa下，具有最大表面积(3370 m（2) g(-1)）的ZTC的吸氢率高达2.2 wt %。这个值比活性炭的大得多，ZTC和活性炭的这种容量差异不能仅仅用比表面积的差异来解释。此外，通过将少量Pt纳米颗粒（约0.2 wt %）加载到ZTC上，在10 MPa下，氢吸收容量从0.87 wt %增加到0.95 wt %。Pt负载增加了碳的吸氢能力，这可以归因于氢通过负载的Pt纳米颗粒溢出到碳表面。
High-pressure hydrogen storage in zeolite-templated carbon (ZTC) was investigated at room temperature (30 degrees C). Several types of ZTCs with different surface areas and a nitrogen-doped ZTC were prepared. Their hydrogen storage performance at room temperature was examined and the results were compared with those of commercial activated carbons. At pressures below 10 MPa, the hydrogen uptake capacity was simply proportional to specific surface areas of the carbons, and both ZTCs and activated carbon showed almost the same heat of adsorption (6 similar to 8 kJ mol(-1)). On the other hand, at pressures above 10 MPa, uniform micropores with a diameter of 1.2 nm in ZTCs played a more important role in capacity increase than the specific surface area. As a result, the ZTC with the largest surface area (3370 m(2) g(-1)) exhibited hydrogen uptake as high as 2.2 wt % at 34 MPa. This value is much larger than that of the activated carbon, and such a difference in the capacity between ZTC and activated carbon cannot be explained by the difference in specific surface area alone. Moreover, by loading only a small amount of Pt nanoparticles (ca. 0.2 wt %) onto ZTC, hydrogen uptake capacity was increased from 0.87 to 0.95 wt % at 10 MPa. The increase of hydrogen uptake capacity by Pt loading can be ascribed to hydrogen spillover through the supported Pt nanoparticles to the carbon surface.