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[资源] 海绵状石墨烯电极能显著提升超级电容器性能已有4人参与

加拿大科学家最近利用海绵状石墨烯显著提升超级电容器性能，工作发表在J. Phys. Chem. Lett.

从事这项研究的科研人员利用他们合成的海绵状石墨烯和钴酞菁分子（PC）复合制备为电极材料。在实验中，研究人员证明在两个常见在超级电容器中使用的电解质（离子液体和含水的）制成的海绵状的石墨烯的电极是稳定的。许多超级电容器电极需在温度为60℃（140°F）或更高时具有很高的功率密度，但这项工作制备的海绵状石墨烯电极在室温下即可良好工作，即可使电解质迅速转移（亦由此产生高的功率密度）。同时，海绵状的石墨烯电极也表现出优异的循环寿命。贯穿万次的充放电循环后，电极在离子电解质和水中分别可以保留90％和98％。

ABSTRACT："We employed a microwave synthesis process of cobalt phthalocyanine molecules templated by acid-functionalized multiwalled carbon nanotubes to create three-dimensional sponge-like graphene nanoarchitectures suited for ionic liquid-based electrochemical capacitor electrodes that operate at very high scan rates. The sequential “bottom-up” molecular synthesis and subsequent carbonization process took less than 20 min to complete. The 3D nanoarchitectures are able to deliver an energy density of 7.1 W·h/kg even at an extra high power density of 48 000 W/kg. In addition, the ionic liquid supercapacitor based on this material works very well at room temperature due to its fully opened structures, which is ideal for the high-power energy application requiring more tolerance to temperature variation. Moreover, the structures are stable in both ionic liquids and 1 M H2SO4, retaining 90 and 98% capacitance after 10 000 cycles, respectively.”
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[ Last edited by alvin_tju on 2012-10-15 at 16:25 ]

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附件 1 : sponge-likegraphene_supercapacitorelectrode_DavidMitlin.pdf

2012-10-15 11:03:13, 1.17 M