back

Electrochemical performance of Er-doped titania film for energy storage applications

Qais M. Al-Bataineh¹*, Ahmad A. Ahmad¹*, Ahmad Migdadi¹
1 Department of Physics, Jordan University of Science and Technology, P.O. Box 3030, Irbid 22110, Jordan.
* Corresponding Author: qais.albataineh@tu-dortmund.de and sema@just.edu.jo
** Equal contribution to the first author.

Developing efficient and sustainable energy storage systems is critical for the advancement of modern technologies. Supercapacitors, offering high power density and long cycle life, are pivotal in this domain. This work investigates the potential of using Er-doped titania films as electrode materials for supercapacitors. The physical properties of Er-doped titania film compared to undoped titania film were investigated through detailed characterization. Electrochemical characterization revealed that Er-doped titania exhibits remarkably enhanced specific capacitance, rate capability, and energy density in both KOH and H2SO4 electrolytes, accompanied by improved cycling stability. More specifically, the specific capacitances of the undoped titania film are 133.7 and 94.9 F∙g‒1 at a scan rate of 50 mV∙s‒1 in KOH and H2SO4 electrolytes, respectively. Introducing Er ions into titania films, increasing the specific capacitance to 171.5 and 104.0 F∙g‒1 in KOH and H2SO4 electrolytes, respectively. These findings offer crucial insights into how rare-earth doping can effectively tailor the properties of metal oxide films, thereby contributing to the design of next-generation energy storage devices.
Keywords: Energy storage applications; Supercapacitors; Titania (TiO2); Er-doped titania; Specific capacitance.