48


nanotimes News in Brief


12-03 :: March/April 2012


Graphene Supercapacitors // Laser Scribed Graphene Supercapacitors


© Based on Material by UCLA R


esearchers from University of California, and the California NanoSystems Institute demonstrate


high-performance graphene-based electrochemical capacitors that maintain excellent electrochemical attributes under high mechanical stress. The resear- chers at UCLA have used a standard LightScribe DVD optical drive to produce such electrodes. The elec- trodes are composed of an expanded network of gra- phene that shows excellent mechanical and electrical properties as well as exceptionally high surface area.


Devices made with Laser Scribed Graphene (LSG) electrodes exhibit ultrahigh energy density values in different electrolytes while maintaining the high po- wer density and excellent cycle stability of ECs. Mo- reover, these ECs maintain excellent electrochemical attributes under high mechanical stress and thus hold promise for high power, flexible electronics.


“Our study demonstrates that our new graphene-ba- sed supercapacitors store as much charge as conven- tional batteries, but can be charged and discharged a hundred to a thousand times faster,” said Richard B. Kaner, professor of chemistry & materials science and engineering.


“Here, we present a strategy for the production of high-performance graphene-based ECs through a simple all solid-state approach that avoids the resta- cking of graphene sheets,” said Maher F. El-Kady,


Schematic showing the structure of laser scribed graphene supercapacitors. © UCLA


the lead author of the study and a graduate student in Kaner‘s lab.


El-Kady, et al.: Laser Scribing of High-Performance and Flexible Graphene-Based Electrochemical Capacitors, In: Science, March 16, 2012, Pages 1326-1330, DOI:10.1126/ science.1216744:


http://dx.doi.org/10.1126/science.1216744 http://www1.cnsi.ucla.edu


Page 1  |  Page 2  |  Page 3  |  Page 4  |  Page 5  |  Page 6  |  Page 7  |  Page 8  |  Page 9  |  Page 10  |  Page 11  |  Page 12  |  Page 13  |  Page 14  |  Page 15  |  Page 16  |  Page 17  |  Page 18  |  Page 19  |  Page 20  |  Page 21  |  Page 22  |  Page 23  |  Page 24  |  Page 25  |  Page 26  |  Page 27  |  Page 28  |  Page 29  |  Page 30  |  Page 31  |  Page 32  |  Page 33  |  Page 34  |  Page 35  |  Page 36  |  Page 37  |  Page 38  |  Page 39  |  Page 40  |  Page 41  |  Page 42  |  Page 43  |  Page 44  |  Page 45  |  Page 46  |  Page 47  |  Page 48  |  Page 49  |  Page 50  |  Page 51  |  Page 52  |  Page 53  |  Page 54  |  Page 55  |  Page 56  |  Page 57  |  Page 58  |  Page 59  |  Page 60  |  Page 61  |  Page 62  |  Page 63  |  Page 64  |  Page 65  |  Page 66  |  Page 67  |  Page 68  |  Page 69  |  Page 70  |  Page 71  |  Page 72  |  Page 73  |  Page 74  |  Page 75  |  Page 76  |  Page 77  |  Page 78  |  Page 79