Effect on TENG Performance by Phase Control of TiOx Nanoparticles

Abstract

One of the critical parameters to improve the output power for triboelectric nanogenerators (TENGs) is the surface charge density. In this work, we modify the tribo-material of TENG by introducing the TiOx embedded Polydimethylsiloxane (PDMS) in anatase and runic phase. The effect of dielectric constant and electronic structure of the TiOx on the capacitance of TENG and the output power as well are discussed. The surface charge density is increased as the control of the dielectric constant in difference weight percent of TiOx and PDMS. As the results of that, the 5% TiOx runic phase and 7% TiOx anatase phase embedded PDMS exhibit the highest TENG output. The peak value of voltage/current obtained from TiOx runic and anatase phase are similar to 180 V/8.2 mu A and 211.6 V/8.7 mu A, respectively, at the external force of 5 N and working frequency of 5 Hz, which gives over 12-fold and 15-fold power enhancement compared with the TENG based on the pristine PDMS film. This study provides a better understanding for TENG performance enhancement from the materials view.