Electret-based Unsteady Thermal Energy Harvester using Potassium Tantalate Niobate Crystal

[摘要] An electret-based unsteady thermal energy harvester is proposed using potassium tantalate niobate (KTa1-xNbxO3, KTN) as a dielectric for the capacitor. By connecting in series the capacitor and an electret serving as a permanent voltage source, the capacitance change with temperature fluctuations alters the amount of induced charges thereby produces the external current. By using KTN having extremely-large temperature coefficient of permittivity together with the CYTOP electret, the output power of 572 nJ has been obtained from one heating cycle, which corresponds to 20 times higher output power than the previous result with BaTiO3.

[发布机构] Dept. of Mechanical Engineering, University of Tokyo, Japan^1

[效力级别] 能源学

[关键词] Capacitance change;Energy Harvester;External currents;Induced charges;Potassium tantalate niobate;Potassium tantalate niobate crystals;Temperature coefficient;Temperature fluctuation