<p>In this study, electrochemical behaviors of terbium in TbCl₃-1-ethyl-3-methyl-imidazolium tetrafluoroborate [EMIm]BF₄ electrolytes and TbCl₃-1-ethyl-3-methyl-imidazolium dicyanamide [EMIm]DCA were studied. In order to investigate the electrochemical behaviors of Tb, TbCl3 was employed and cyclic voltammetry and chronoamperometry were used. The electrodeposits obtained from above electrolytes were characterized by X-ray diffraction analysis. The cyclic voltammetry results revealed that the reduction processes of Tb in TbCl3-[EMIm]BF4 and TbCl3-[EMIm]DCA were irreversible and diffusion-controlled and the average transfer coefficients of Tb3 + were about 0.414 and 0.382, respectively. From the results of the chronoamperometry experiments, it was confirmed that the reduction processes of Tb in TbCl₃-[EMIm]BF₄ electrolytes and TbCl₃-[EMIm]DCA electrolytes were irreversible and followed single-step mechanism. The diffusion coefficients of Tb³⁺ obtained from the cyclic voltammetry results were approximately 5.22 × 10⁻⁷ cm²/s. and 2.18 × 10⁻⁶ cm²/s, respectively. X-ray diffraction analysis results of electrodeposits from TbCl₃-[EMIm]BF₄ electrolytes and TbCl₃-[EMIm]DCA electrolytes proved that metallic terbium was obtained.</p> Graphical Abstract <p></p>