Structure and Electrochemical Performance of Carbide-Derived Carbon Nanopowders
Structure and Electrochemical Performance of Carbide-Derived Carbon Nanopowders
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DOI：
10.1002/adfm.201200695
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发表时间：
2013-02-25
影响因子：
19
通讯作者：
Gogotsi, Yury
中科院分区：
文献类型：
--
作者：
Perez, Carlos R.;Yeon, Sun-Hwa;Gogotsi, Yury
微孔碳材料广泛应用于储气、吸附剂、超级电容器电极、海水淡化、催化剂支撑等领域。虽然这些微孔碳的粒径通常在1100米范围内，但本文报道了在200摄氏度及以上的温度下，从纳米级碳化钛（TiC）粉末中提取钛，合成粒径约为30纳米的多孔碳化物衍生碳（CDC）。在200400℃下制备的纳米CDCs结构无序，存在CN sp1键。在400℃以上，CN键消失，结构转变为无序碳，与碳化物微粉合成后的结构相似。与微米级碳化硅相比，纳米级碳化硅由于颗粒间孔隙度的存在，具有更宽的孔径分布，而且表层对纳米级碳化硅的贡献更大。该材料具有易于接近的孔隙和较大的比表面积，表现出优异的电化学性能。
Microporous carbon materials are widely used in gas storage, sorbents, supercapacitor electrodes, water desalination, and catalyst supports. While these microporous carbons usually have a particle size in the 1100 m range, here the synthesis of porous carbide-derived carbon (CDC) with particle diameters around 30 nm by extraction of titanium from nanometer-sized titanium carbide (TiC) powder at temperatures of 200 degrees C and above is reported. Nanometer-sized CDCs prepared at 200400 degrees C show a disordered structure and the presence of CN sp1 bonds. Above 400 degrees C, the CN bond disappears with the structure transition to disordered carbon similar to that observed after synthesis from carbide micropowders. Compared to CDCs produced from micrometer-sized TiC, nano-CDC has a broader pore size distribution due to interparticle porosity and a large contribution from the surface layers. The material shows excellent electrochemical performance due to its easily accessible pores and a large specific surface area.