Mesocellular Foam Carbons: Aggregates of Hollow Carbon Spheres with Open and Closed Wall Structures
Mesocellular Foam Carbons: Aggregates of Hollow Carbon Spheres with Open and Closed Wall Structures
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DOI：
10.1021/cm0494296
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发表时间：
2004-09
影响因子：
8.6
通讯作者：
Yukito Oda;Katsuya Fukuyama;K. Nishikawa;S. Namba;H. Yoshitake;T. Tatsumi
中科院分区：
文献类型：
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作者：
Yukito Oda;Katsuya Fukuyama;K. Nishikawa;S. Namba;H. Yoshitake;T. Tatsumi
以介孔泡沫（MCF）二氧化硅为模板，可以合成具有介孔结构的空心球炭。通过蔗糖的两步浸渍和在900 °C下在流动氩气下的连续碳化来制备由具有封闭壁和直径约4 nm的中孔的球形中空体组成的碳结构。程序升温氧化实验表明，当加热到600 °C以上时，中孔碳释放出氩原子，此时碳壁发生氧化。该结果提供了碳球内部存在大空隙体积的证据，并意味着4 nm的孔径是由于球间空间。一个单一的步骤浸渍的蔗糖导致在形成的开壁的中间球与4，18，和24 nm的孔。两个较大的孔径归因于窗口和细胞的直径，如在MCF-二氧化硅中。铂负载在这些介孔碳上。该金属是高度分散的（约0.4 nm的EXAFS）在...
A mesostructured hollow sphere form of carbon can be synthesized by using mesocellular foam (MCF) silica as template. A carbon structure composed of spherical hollows with closed walls and with mesopores of around 4 nm in diameter was prepared by the two-step impregnation of sucrose and successive carbonization under flowing argon at 900 °C. A temperature-programmed oxidation experiment revealed that the mesoporous carbon released argon atoms when heated above 600 °C, when oxidation of the carbon walls occurred. This result provides evidence for the presence of a large void volume inside the carbon spheres and implies that the pore size of 4 nm is due to the interspheric space. A single-step impregnation of sucrose resulted in the formation of open-walled mesospheres with pores of 4, 18, and 24 nm. The two larger pore sizes are attributed to the diameters of the window and of the cell as in MCF−silica. Platinum was loaded on these mesoporous carbons. The metal was highly dispersed (∼0.4 nm by EXAFS) on th...