LASER TRANSFERRED HYDROUS RUTHENIUM OXIDE ELECTRODES FOR MICRO-ULTRACAPACITORS

摘要

Hydrous ruthenium oxide (RuO_2·0.5 H_2O) electrodes have been deposited under ambient conditions using a laser transfer process. The transferred material exhibits a porous, high surface area morphology that is ideally suited for micro-ultracapacitor electrodes. Electrochemical evaluation of single electrodes via cyclic voltammetry (CV) reveals that the laser transfer process does not adversely affect the electrochemical properties of the RuO_2·0.5 H_2O. The CV curves exhibit constant current behavior with high specific capacitance. As the scan rate is increased, there is a slight decrease in the specific capacitance that is comparable to previously reported data. The specific capacitance decreases only 23 % between 5 mV·s~(-1) and 100 mV·s~(-1). In situ lasermicromachining is used to shape the deposited electrode material into planar micro-ultracapacitor cells that show excellent charge storage as well as high discharge current capabilities.