Electrochemical Supercapacitor Electrodes from Sponge-like Graphene Nanoarchitectures with Ultrahigh Power Density

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• 作者：Zhanwei Xu ; Zhi Li ; Chris M. B. Holt ; Xuehai Tan ; Huanlei Wang ; Babak Shalchi Amirkhiz ; Tyler Stephenson ; David Mitlin
• 刊名：The Journal of Physical Chemistry Letters
• 出版年：2012
• 出版时间：October 18, 2012
• 年：2012
• 卷：3
• 期：20
• 页码：2928-2933
• 全文大小：418K
• 年卷期：v.3,no.20(October 18, 2012)
• ISSN：1948-7185

文摘

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 鈥渂ottom-up鈥?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路h kg^鈥? even at an extra high power density of 48鈥?00 W kg^鈥?. 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鈥?00 cycles, respectively.

Keywords:

electrochemical capacitor; three-dimensional; graphene; carbon nanotube; microwave