Carbon-coated mesoporous silica as an electrode material
Carbon-coated mesoporous silica as an electrode material
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DOI：
10.1016/j.micromeso.2010.03.022
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发表时间：
2010-08
影响因子：
5.2
通讯作者：
Taeri Kwon;H. Nishihara;Yu Fukura;Kouta Inde;N. Setoyama;Y. Fukushima;T. Kyotani
中科院分区：
文献类型：
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作者：
Taeri Kwon;H. Nishihara;Yu Fukura;Kouta Inde;N. Setoyama;Y. Fukushima;T. Kyotani
通过在孔表面碳化预掺杂的有机醇分子，在FSM-16型介孔二氧化硅的整个孔表面均匀地包覆了一层薄的碳层。碳层的厚度估计是非常薄的，即它只对应于1-2个石墨烯层。即使在碳包覆后，FSM-16仍保持其固有的有序孔结构(柱状孔的六角形排列)，并仍具有530m2g−1的高比表面积，但其孔性质完全转变为疏水性，这从极少量的水蒸气吸附可以看出。我们用相同的包覆方法制备了碳包覆的FSM-16和碳包覆的SBA-15，并对其电化学性质进行了表征。它们在1M H_2SO_4和1M NaC l中均表现出双电层电容，其单位比表面积的电容值与常规活性碳相当。由此可见，碳涂层使介孔二氧化硅的性质由绝缘体转变为导电体，其有序孔结构保持不变，可以作为具有均匀气孔的电极材料。
The entire pore surface of FSM-16 type mesoporous silica was uniformly coated with a thin carbon layer by carbonizing pre-doped organic-alcohol molecules onto the pore surface. The thickness of the carbon layer was estimated to be extremely thin, i.e., it corresponds to only 1–2 graphene layers. Even after the carbon-coating, FSM-16 preserves its intrinsic ordered pore structure (hexagonal array of cylindrical pores) and still possesses high surface area of 530m2g−1, but its pore nature was completely converted into a hydrophobic one, which was revealed from a very small amount of water–vapor adsorption. We characterized the electrochemical properties of the carbon-coated FSM-16 together with the carbon-coated SBA-15 synthesized by using the same coating method. Both of them exhibited electric double-layer capacitance in 1M H2SO4and 1M NaCl, and the values of the capacitance per surface area are comparable to those of conventional activated carbons. We can thus conclude that the present carbon-coating changes the nature of mesoporous silicas from an insulator to an electrical conductor with their ordered pore structures unchanged, and the carbon-coated mesoporous silicas can be used as electrode materials with uniform pores.