Fall 2010 IAB
September 15 to 17

Liwei Lin, Vice Chair, Graduate Studies, UC Berkley ME Department

Micro Energy Sources and Session Summary

Planar micro supercapacitors utilizing vertically aligned carbon nanotube (CNT) forests with the design of interdigital electrodes will be described. Prototypes show measured specific capacitances 1000 times higher than those with plain metal electrodes without CNT forests. Charging/discharging experiments show over 90% efficiency and very robust cycling stability. These planar MEMS supercapacitors could be applicable in various systems including pulse-power supplies and advanced microelectronics with on-chip capacitors, and energy harvesters. Such supercapacitor a bility to integrate very low power harvesters over long periods of time (weeks or more) make feasible even low submicrowatt sources such as our microfabricated submicrowatt microbial fuel cell. Other microenergy generation/storage topics will also be described.