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nature nanotechnology最新:石墨烯超级电容器
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Microscale supercapacitors provide an important complement to batteries in a variety of applications, including portable electronics. Although they can be manufactured using a number of printing and lithography techniques1–3, continued improvements in cost, scalability and form factor are required to realize their full potential. Here, we demonstrate the scalable fabrication of a new type of all-carbon, monolithic supercapacitor by laser reduction and patterning of graphite oxide films. We pattern both in-plane and conventional electrodes consisting of reduced graphite oxide with micrometre resolution, between which graphite oxide serves as a solid electrolyte4–9. The substantial amounts of trapped water in the graphite oxide makes it simultaneously a good ionic conductor and an electrical insulator, allowing it to serve as both an electrolyte and an electrode separator with ion transport characteristics similar to that observed for Nafion membranes10,11. The resulting micro-supercapacitor devices show good cyclic stability, and energy storage capacities comparable to existing thinfilm supercapacitors1.Direct laser writing of micro-supercapacitors on hydrated graphite oxide films.  |
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69楼2013-03-31 20:52:30
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