Preparation of Hierarchically Porous Graphitic Carbon Spheres and Their Applications in Supercapacitors and Dye Adsorption.
Preparation of Hierarchically Porous Graphitic Carbon Spheres and Their Applications in Supercapacitors and Dye Adsorption.
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分级孔结构石墨碳多孔球的制备及其在超级电容器和染料吸附中的应用
DOI：
10.3390/nano8080625
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发表时间：
2018-08-17
期刊：
影响因子：
--
通讯作者：
Zhang S
中科院分区：
文献类型：
--
作者：
Li S;Li F;Wang J;Tian L;Zhang H;Zhang S
采用铁催化水热炭化非晶态碳球石墨化的方法，合成了粒径均匀的~0.35 μm级微/介孔石墨碳球（HGCS）。以1.0 wt % Fe为催化剂，900℃加热3 h得到的HGCS石墨化程度高，比表面积高达564 m2/g。在0.2 A/g下，它们还具有140 F/g的高比电容和良好的电化学稳定性，在连续2500次循环后电容保持率为94%。HGCS的石墨化程度占比电容的60%，单位表面积比电容高达0.2 F/m2，远远高于之前报道的大多数多孔非晶碳材料。此外，HGCS对亚甲基蓝（MB）的吸附量高达182.8 mg/g，是石墨化前碳球的12倍。
Hierarchical micro-/mesoporous graphitic carbon spheres (HGCS) with a uniform diameter of ~0.35 μm were synthesized by Fe-catalyzed graphitization of amorphous carbon spheres resultant from hydrothermal carbonization. The HGCS resultant from 3 h at 900 °C with 1.0 wt % Fe catalyst had a high graphitization degree and surface area as high as 564 m2/g. They also exhibited high specific capacitance of 140 F/g at 0.2 A/g and good electrochemical stability with 94% capacitance retention after consecutive 2500 cycles. The graphitization degree of the HGCS contributed to 60% of their specific capacitance, and their specific capacitance per unit surface area was as high as 0.2 F/m2, which was much higher than in the most cases of porous amorphous carbon materials reported before. In addition, the HGCS showed a high adsorption capacity of 182.8 mg/g for methylene blue (MB), which was 12 times as high as that in the case of carbon spheres before graphitization.
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